Feature 10922: Stop, start and rebuild
[osm/RO.git] / NG-RO / osm_ng_ro / ns.py
index 1c2e960..3f14c58 100644 (file)
 # limitations under the License.
 ##
 
-import logging
-# import yaml
-from traceback import format_exc as traceback_format_exc
-from osm_ng_ro.ns_thread import NsWorker, NsWorkerException, deep_get
-from osm_ng_ro.validation import validate_input, deploy_schema
-from osm_common import dbmongo, dbmemory, fslocal, fsmongo, msglocal, msgkafka, version as common_version
-from osm_common.dbbase import DbException
-from osm_common.fsbase import FsException
-from osm_common.msgbase import MsgException
 from http import HTTPStatus
-from uuid import uuid4
-from threading import Lock
+import logging
 from random import choice as random_choice
+from threading import Lock
 from time import time
-from jinja2 import Environment, TemplateError, TemplateNotFound, StrictUndefined, UndefinedError
+from traceback import format_exc as traceback_format_exc
+from typing import Any, Dict, Tuple, Type
+from uuid import uuid4
+
+from cryptography.hazmat.backends import default_backend as crypto_default_backend
 from cryptography.hazmat.primitives import serialization as crypto_serialization
 from cryptography.hazmat.primitives.asymmetric import rsa
-from cryptography.hazmat.backends import default_backend as crypto_default_backend
+from jinja2 import (
+    Environment,
+    StrictUndefined,
+    TemplateError,
+    TemplateNotFound,
+    UndefinedError,
+)
+from osm_common import (
+    dbmemory,
+    dbmongo,
+    fslocal,
+    fsmongo,
+    msgkafka,
+    msglocal,
+    version as common_version,
+)
+from osm_common.dbbase import DbBase, DbException
+from osm_common.fsbase import FsBase, FsException
+from osm_common.msgbase import MsgException
+from osm_ng_ro.ns_thread import deep_get, NsWorker, NsWorkerException
+from osm_ng_ro.validation import deploy_schema, validate_input
+import yaml
 
 __author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>"
 min_common_version = "0.1.16"
 
 
 class NsException(Exception):
-
     def __init__(self, message, http_code=HTTPStatus.BAD_REQUEST):
         self.http_code = http_code
         super(Exception, self).__init__(message)
@@ -58,10 +73,12 @@ def get_process_id():
             text_id_ = f.readline()
             _, _, text_id = text_id_.rpartition("/")
             text_id = text_id.replace("\n", "")[:12]
+
             if text_id:
                 return text_id
     except Exception:
         pass
+
     # Return a random id
     return "".join(random_choice("0123456789abcdef") for _ in range(12))
 
@@ -69,13 +86,14 @@ def get_process_id():
 def versiontuple(v):
     """utility for compare dot separate versions. Fills with zeros to proper number comparison"""
     filled = []
+
     for point in v.split("."):
         filled.append(point.zfill(8))
+
     return tuple(filled)
 
 
 class Ns(object):
-
     def __init__(self):
         self.db = None
         self.fs = None
@@ -91,6 +109,20 @@ class Ns(object):
         self.next_worker = 0
         self.plugins = {}
         self.workers = []
+        self.process_params_function_map = {
+            "net": Ns._process_net_params,
+            "image": Ns._process_image_params,
+            "flavor": Ns._process_flavor_params,
+            "vdu": Ns._process_vdu_params,
+            "affinity-or-anti-affinity-group": Ns._process_affinity_group_params,
+        }
+        self.db_path_map = {
+            "net": "vld",
+            "image": "image",
+            "flavor": "flavor",
+            "vdu": "vdur",
+            "affinity-or-anti-affinity-group": "affinity-or-anti-affinity-group",
+        }
 
     def init_db(self, target_version):
         pass
@@ -105,10 +137,14 @@ class Ns(object):
         self.config = config
         self.config["process_id"] = get_process_id()  # used for HA identity
         self.logger = logging.getLogger("ro.ns")
+
         # check right version of common
         if versiontuple(common_version) < versiontuple(min_common_version):
-            raise NsException("Not compatible osm/common version '{}'. Needed '{}' or higher".format(
-                common_version, min_common_version))
+            raise NsException(
+                "Not compatible osm/common version '{}'. Needed '{}' or higher".format(
+                    common_version, min_common_version
+                )
+            )
 
         try:
             if not self.db:
@@ -119,8 +155,12 @@ class Ns(object):
                     self.db = dbmemory.DbMemory()
                     self.db.db_connect(config["database"])
                 else:
-                    raise NsException("Invalid configuration param '{}' at '[database]':'driver'".format(
-                        config["database"]["driver"]))
+                    raise NsException(
+                        "Invalid configuration param '{}' at '[database]':'driver'".format(
+                            config["database"]["driver"]
+                        )
+                    )
+
             if not self.fs:
                 if config["storage"]["driver"] == "local":
                     self.fs = fslocal.FsLocal()
@@ -131,8 +171,12 @@ class Ns(object):
                 elif config["storage"]["driver"] is None:
                     pass
                 else:
-                    raise NsException("Invalid configuration param '{}' at '[storage]':'driver'".format(
-                        config["storage"]["driver"]))
+                    raise NsException(
+                        "Invalid configuration param '{}' at '[storage]':'driver'".format(
+                            config["storage"]["driver"]
+                        )
+                    )
+
             if not self.msg:
                 if config["message"]["driver"] == "local":
                     self.msg = msglocal.MsgLocal()
@@ -141,15 +185,18 @@ class Ns(object):
                     self.msg = msgkafka.MsgKafka()
                     self.msg.connect(config["message"])
                 else:
-                    raise NsException("Invalid configuration param '{}' at '[message]':'driver'".format(
-                        config["message"]["driver"]))
+                    raise NsException(
+                        "Invalid configuration param '{}' at '[message]':'driver'".format(
+                            config["message"]["driver"]
+                        )
+                    )
 
             # TODO load workers to deal with exising database tasks
 
             self.write_lock = Lock()
         except (DbException, FsException, MsgException) as e:
             raise NsException(str(e), http_code=e.http_code)
-    
+
     def get_assigned_vims(self):
         return list(self.vims_assigned.keys())
 
@@ -157,13 +204,17 @@ class Ns(object):
         try:
             if self.db:
                 self.db.db_disconnect()
+
             if self.fs:
                 self.fs.fs_disconnect()
+
             if self.msg:
                 self.msg.disconnect()
+
             self.write_lock = None
         except (DbException, FsException, MsgException) as e:
             raise NsException(str(e), http_code=e.http_code)
+
         for worker in self.workers:
             worker.insert_task(("terminate",))
 
@@ -174,20 +225,34 @@ class Ns(object):
         return the index of the assigned worker thread. Worker threads are storead at self.workers
         """
         # Look for a thread in idle status
-        worker_id = next((i for i in range(len(self.workers)) if self.workers[i] and self.workers[i].idle), None)
+        worker_id = next(
+            (
+                i
+                for i in range(len(self.workers))
+                if self.workers[i] and self.workers[i].idle
+            ),
+            None,
+        )
+
         if worker_id is not None:
             # unset idle status to avoid race conditions
             self.workers[worker_id].idle = False
         else:
             worker_id = len(self.workers)
+
             if worker_id < self.config["global"]["server.ns_threads"]:
                 # create a new worker
-                self.workers.append(NsWorker(worker_id, self.config, self.plugins, self.db))
+                self.workers.append(
+                    NsWorker(worker_id, self.config, self.plugins, self.db)
+                )
                 self.workers[worker_id].start()
             else:
                 # reached maximum number of threads, assign VIM to an existing one
                 worker_id = self.next_worker
-                self.next_worker = (self.next_worker + 1) % self.config["global"]["server.ns_threads"]
+                self.next_worker = (self.next_worker + 1) % self.config["global"][
+                    "server.ns_threads"
+                ]
+
         return worker_id
 
     def assign_vim(self, target_id):
@@ -230,498 +295,1881 @@ class Ns(object):
     def unload_unused_vims(self):
         with self.write_lock:
             vims_to_unload = []
+
             for target_id in self.vims_assigned:
-                if not self.db.get_one("ro_tasks",
-                                       q_filter={"target_id": target_id,
-                                                 "tasks.status": ['SCHEDULED', 'BUILD', 'DONE', 'FAILED']},
-                                       fail_on_empty=False):
+                if not self.db.get_one(
+                    "ro_tasks",
+                    q_filter={
+                        "target_id": target_id,
+                        "tasks.status": ["SCHEDULED", "BUILD", "DONE", "FAILED"],
+                    },
+                    fail_on_empty=False,
+                ):
                     vims_to_unload.append(target_id)
+
             for target_id in vims_to_unload:
                 self._unload_vim(target_id)
 
-    def _get_cloud_init(self, where):
-        """
-        Not used as cloud init content is provided in the http body. This method reads cloud init from a file
-        :param where: can be 'vnfr_id:file:file_name' or 'vnfr_id:vdu:vdu_idex'
-        :return:
+    @staticmethod
+    def _get_cloud_init(
+        db: Type[DbBase],
+        fs: Type[FsBase],
+        location: str,
+    ) -> str:
+        """This method reads cloud init from a file.
+
+        Note: Not used as cloud init content is provided in the http body.
+
+        Args:
+            db (Type[DbBase]): [description]
+            fs (Type[FsBase]): [description]
+            location (str): can be 'vnfr_id:file:file_name' or 'vnfr_id:vdu:vdu_idex'
+
+        Raises:
+            NsException: [description]
+            NsException: [description]
+
+        Returns:
+            str: [description]
         """
-        vnfd_id, _, other = where.partition(":")
+        vnfd_id, _, other = location.partition(":")
         _type, _, name = other.partition(":")
-        vnfd = self.db.get_one("vnfds", {"_id": vnfd_id})
+        vnfd = db.get_one("vnfds", {"_id": vnfd_id})
+
         if _type == "file":
             base_folder = vnfd["_admin"]["storage"]
-            cloud_init_file = "{}/{}/cloud_init/{}".format(base_folder["folder"], base_folder["pkg-dir"], name)
-            if not self.fs:
-                raise NsException("Cannot read file '{}'. Filesystem not loaded, change configuration at storage.driver"
-                                  .format(cloud_init_file))
-            with self.fs.file_open(cloud_init_file, "r") as ci_file:
+            cloud_init_file = "{}/{}/cloud_init/{}".format(
+                base_folder["folder"], base_folder["pkg-dir"], name
+            )
+
+            if not fs:
+                raise NsException(
+                    "Cannot read file '{}'. Filesystem not loaded, change configuration at storage.driver".format(
+                        cloud_init_file
+                    )
+                )
+
+            with fs.file_open(cloud_init_file, "r") as ci_file:
                 cloud_init_content = ci_file.read()
         elif _type == "vdu":
             cloud_init_content = vnfd["vdu"][int(name)]["cloud-init"]
         else:
-            raise NsException("Mismatch descriptor for cloud init: {}".format(where))
-        return cloud_init_content
+            raise NsException("Mismatch descriptor for cloud init: {}".format(location))
 
-    def _parse_jinja2(self, cloud_init_content, params, context):
+        return cloud_init_content
 
+    @staticmethod
+    def _parse_jinja2(
+        cloud_init_content: str,
+        params: Dict[str, Any],
+        context: str,
+    ) -> str:
+        """Function that processes the cloud init to replace Jinja2 encoded parameters.
+
+        Args:
+            cloud_init_content (str): [description]
+            params (Dict[str, Any]): [description]
+            context (str): [description]
+
+        Raises:
+            NsException: [description]
+            NsException: [description]
+
+        Returns:
+            str: [description]
+        """
         try:
             env = Environment(undefined=StrictUndefined)
             template = env.from_string(cloud_init_content)
+
             return template.render(params or {})
         except UndefinedError as e:
             raise NsException(
                 "Variable '{}' defined at vnfd='{}' must be provided in the instantiation parameters"
-                "inside the 'additionalParamsForVnf' block".format(e, context))
+                "inside the 'additionalParamsForVnf' block".format(e, context)
+            )
         except (TemplateError, TemplateNotFound) as e:
-            raise NsException("Error parsing Jinja2 to cloud-init content at vnfd='{}': {}".format(context, e))
+            raise NsException(
+                "Error parsing Jinja2 to cloud-init content at vnfd='{}': {}".format(
+                    context, e
+                )
+            )
 
     def _create_db_ro_nsrs(self, nsr_id, now):
         try:
             key = rsa.generate_private_key(
-                backend=crypto_default_backend(),
-                public_exponent=65537,
-                key_size=2048
+                backend=crypto_default_backend(), public_exponent=65537, key_size=2048
             )
             private_key = key.private_bytes(
                 crypto_serialization.Encoding.PEM,
                 crypto_serialization.PrivateFormat.PKCS8,
-                crypto_serialization.NoEncryption())
+                crypto_serialization.NoEncryption(),
+            )
             public_key = key.public_key().public_bytes(
                 crypto_serialization.Encoding.OpenSSH,
-                crypto_serialization.PublicFormat.OpenSSH
+                crypto_serialization.PublicFormat.OpenSSH,
             )
-            private_key = private_key.decode('utf8')
+            private_key = private_key.decode("utf8")
             # Change first line because Paramiko needs a explicit start with 'BEGIN RSA PRIVATE KEY'
             i = private_key.find("\n")
             private_key = "-----BEGIN RSA PRIVATE KEY-----" + private_key[i:]
-            public_key = public_key.decode('utf8')
+            public_key = public_key.decode("utf8")
         except Exception as e:
             raise NsException("Cannot create ssh-keys: {}".format(e))
 
         schema_version = "1.1"
-        private_key_encrypted = self.db.encrypt(private_key, schema_version=schema_version, salt=nsr_id)
+        private_key_encrypted = self.db.encrypt(
+            private_key, schema_version=schema_version, salt=nsr_id
+        )
         db_content = {
             "_id": nsr_id,
             "_admin": {
                 "created": now,
                 "modified": now,
-                "schema_version": schema_version
+                "schema_version": schema_version,
             },
             "public_key": public_key,
             "private_key": private_key_encrypted,
-            "actions": []
+            "actions": [],
         }
         self.db.create("ro_nsrs", db_content)
+
         return db_content
 
+    @staticmethod
+    def _create_task(
+        deployment_info: Dict[str, Any],
+        target_id: str,
+        item: str,
+        action: str,
+        target_record: str,
+        target_record_id: str,
+        extra_dict: Dict[str, Any] = None,
+    ) -> Dict[str, Any]:
+        """Function to create task dict from deployment information.
+
+        Args:
+            deployment_info (Dict[str, Any]): [description]
+            target_id (str): [description]
+            item (str): [description]
+            action (str): [description]
+            target_record (str): [description]
+            target_record_id (str): [description]
+            extra_dict (Dict[str, Any], optional): [description]. Defaults to None.
+
+        Returns:
+            Dict[str, Any]: [description]
+        """
+        task = {
+            "target_id": target_id,  # it will be removed before pushing at database
+            "action_id": deployment_info.get("action_id"),
+            "nsr_id": deployment_info.get("nsr_id"),
+            "task_id": f"{deployment_info.get('action_id')}:{deployment_info.get('task_index')}",
+            "status": "SCHEDULED",
+            "action": action,
+            "item": item,
+            "target_record": target_record,
+            "target_record_id": target_record_id,
+        }
+
+        if extra_dict:
+            task.update(extra_dict)  # params, find_params, depends_on
+
+        deployment_info["task_index"] = deployment_info.get("task_index", 0) + 1
+
+        return task
+
+    @staticmethod
+    def _create_ro_task(
+        target_id: str,
+        task: Dict[str, Any],
+    ) -> Dict[str, Any]:
+        """Function to create an RO task from task information.
+
+        Args:
+            target_id (str): [description]
+            task (Dict[str, Any]): [description]
+
+        Returns:
+            Dict[str, Any]: [description]
+        """
+        now = time()
+
+        _id = task.get("task_id")
+        db_ro_task = {
+            "_id": _id,
+            "locked_by": None,
+            "locked_at": 0.0,
+            "target_id": target_id,
+            "vim_info": {
+                "created": False,
+                "created_items": None,
+                "vim_id": None,
+                "vim_name": None,
+                "vim_status": None,
+                "vim_details": None,
+                "vim_message": None,
+                "refresh_at": None,
+            },
+            "modified_at": now,
+            "created_at": now,
+            "to_check_at": now,
+            "tasks": [task],
+        }
+
+        return db_ro_task
+
+    @staticmethod
+    def _process_image_params(
+        target_image: Dict[str, Any],
+        indata: Dict[str, Any],
+        vim_info: Dict[str, Any],
+        target_record_id: str,
+        **kwargs: Dict[str, Any],
+    ) -> Dict[str, Any]:
+        """Function to process VDU image parameters.
+
+        Args:
+            target_image (Dict[str, Any]): [description]
+            indata (Dict[str, Any]): [description]
+            vim_info (Dict[str, Any]): [description]
+            target_record_id (str): [description]
+
+        Returns:
+            Dict[str, Any]: [description]
+        """
+        find_params = {}
+
+        if target_image.get("image"):
+            find_params["filter_dict"] = {"name": target_image.get("image")}
+
+        if target_image.get("vim_image_id"):
+            find_params["filter_dict"] = {"id": target_image.get("vim_image_id")}
+
+        if target_image.get("image_checksum"):
+            find_params["filter_dict"] = {
+                "checksum": target_image.get("image_checksum")
+            }
+
+        return {"find_params": find_params}
+
+    @staticmethod
+    def _get_resource_allocation_params(
+        quota_descriptor: Dict[str, Any],
+    ) -> Dict[str, Any]:
+        """Read the quota_descriptor from vnfd and fetch the resource allocation properties from the
+        descriptor object.
+
+        Args:
+            quota_descriptor (Dict[str, Any]): cpu/mem/vif/disk-io quota descriptor
+
+        Returns:
+            Dict[str, Any]: quota params for limit, reserve, shares from the descriptor object
+        """
+        quota = {}
+
+        if quota_descriptor.get("limit"):
+            quota["limit"] = int(quota_descriptor["limit"])
+
+        if quota_descriptor.get("reserve"):
+            quota["reserve"] = int(quota_descriptor["reserve"])
+
+        if quota_descriptor.get("shares"):
+            quota["shares"] = int(quota_descriptor["shares"])
+
+        return quota
+
+    @staticmethod
+    def _process_guest_epa_quota_params(
+        guest_epa_quota: Dict[str, Any],
+        epa_vcpu_set: bool,
+    ) -> Dict[str, Any]:
+        """Function to extract the guest epa quota parameters.
+
+        Args:
+            guest_epa_quota (Dict[str, Any]): [description]
+            epa_vcpu_set (bool): [description]
+
+        Returns:
+            Dict[str, Any]: [description]
+        """
+        result = {}
+
+        if guest_epa_quota.get("cpu-quota") and not epa_vcpu_set:
+            cpuquota = Ns._get_resource_allocation_params(
+                guest_epa_quota.get("cpu-quota")
+            )
+
+            if cpuquota:
+                result["cpu-quota"] = cpuquota
+
+        if guest_epa_quota.get("mem-quota"):
+            vduquota = Ns._get_resource_allocation_params(
+                guest_epa_quota.get("mem-quota")
+            )
+
+            if vduquota:
+                result["mem-quota"] = vduquota
+
+        if guest_epa_quota.get("disk-io-quota"):
+            diskioquota = Ns._get_resource_allocation_params(
+                guest_epa_quota.get("disk-io-quota")
+            )
+
+            if diskioquota:
+                result["disk-io-quota"] = diskioquota
+
+        if guest_epa_quota.get("vif-quota"):
+            vifquota = Ns._get_resource_allocation_params(
+                guest_epa_quota.get("vif-quota")
+            )
+
+            if vifquota:
+                result["vif-quota"] = vifquota
+
+        return result
+
+    @staticmethod
+    def _process_guest_epa_numa_params(
+        guest_epa_quota: Dict[str, Any],
+    ) -> Tuple[Dict[str, Any], bool]:
+        """[summary]
+
+        Args:
+            guest_epa_quota (Dict[str, Any]): [description]
+
+        Returns:
+            Tuple[Dict[str, Any], bool]: [description]
+        """
+        numa = {}
+        epa_vcpu_set = False
+
+        if guest_epa_quota.get("numa-node-policy"):
+            numa_node_policy = guest_epa_quota.get("numa-node-policy")
+
+            if numa_node_policy.get("node"):
+                numa_node = numa_node_policy["node"][0]
+
+                if numa_node.get("num-cores"):
+                    numa["cores"] = numa_node["num-cores"]
+                    epa_vcpu_set = True
+
+                paired_threads = numa_node.get("paired-threads", {})
+                if paired_threads.get("num-paired-threads"):
+                    numa["paired-threads"] = int(
+                        numa_node["paired-threads"]["num-paired-threads"]
+                    )
+                    epa_vcpu_set = True
+
+                if paired_threads.get("paired-thread-ids"):
+                    numa["paired-threads-id"] = []
+
+                    for pair in paired_threads["paired-thread-ids"]:
+                        numa["paired-threads-id"].append(
+                            (
+                                str(pair["thread-a"]),
+                                str(pair["thread-b"]),
+                            )
+                        )
+
+                if numa_node.get("num-threads"):
+                    numa["threads"] = int(numa_node["num-threads"])
+                    epa_vcpu_set = True
+
+                if numa_node.get("memory-mb"):
+                    numa["memory"] = max(int(int(numa_node["memory-mb"]) / 1024), 1)
+
+        return numa, epa_vcpu_set
+
+    @staticmethod
+    def _process_guest_epa_cpu_pinning_params(
+        guest_epa_quota: Dict[str, Any],
+        vcpu_count: int,
+        epa_vcpu_set: bool,
+    ) -> Tuple[Dict[str, Any], bool]:
+        """[summary]
+
+        Args:
+            guest_epa_quota (Dict[str, Any]): [description]
+            vcpu_count (int): [description]
+            epa_vcpu_set (bool): [description]
+
+        Returns:
+            Tuple[Dict[str, Any], bool]: [description]
+        """
+        numa = {}
+        local_epa_vcpu_set = epa_vcpu_set
+
+        if (
+            guest_epa_quota.get("cpu-pinning-policy") == "DEDICATED"
+            and not epa_vcpu_set
+        ):
+            numa[
+                "cores"
+                if guest_epa_quota.get("cpu-thread-pinning-policy") != "PREFER"
+                else "threads"
+            ] = max(vcpu_count, 1)
+            local_epa_vcpu_set = True
+
+        return numa, local_epa_vcpu_set
+
+    @staticmethod
+    def _process_epa_params(
+        target_flavor: Dict[str, Any],
+    ) -> Dict[str, Any]:
+        """[summary]
+
+        Args:
+            target_flavor (Dict[str, Any]): [description]
+
+        Returns:
+            Dict[str, Any]: [description]
+        """
+        extended = {}
+        numa = {}
+
+        if target_flavor.get("guest-epa"):
+            guest_epa = target_flavor["guest-epa"]
+
+            numa, epa_vcpu_set = Ns._process_guest_epa_numa_params(
+                guest_epa_quota=guest_epa
+            )
+
+            if guest_epa.get("mempage-size"):
+                extended["mempage-size"] = guest_epa.get("mempage-size")
+
+            tmp_numa, epa_vcpu_set = Ns._process_guest_epa_cpu_pinning_params(
+                guest_epa_quota=guest_epa,
+                vcpu_count=int(target_flavor.get("vcpu-count", 1)),
+                epa_vcpu_set=epa_vcpu_set,
+            )
+            numa.update(tmp_numa)
+
+            extended.update(
+                Ns._process_guest_epa_quota_params(
+                    guest_epa_quota=guest_epa,
+                    epa_vcpu_set=epa_vcpu_set,
+                )
+            )
+
+        if numa:
+            extended["numas"] = [numa]
+
+        return extended
+
+    @staticmethod
+    def _process_flavor_params(
+        target_flavor: Dict[str, Any],
+        indata: Dict[str, Any],
+        vim_info: Dict[str, Any],
+        target_record_id: str,
+        **kwargs: Dict[str, Any],
+    ) -> Dict[str, Any]:
+        """[summary]
+
+        Args:
+            target_flavor (Dict[str, Any]): [description]
+            indata (Dict[str, Any]): [description]
+            vim_info (Dict[str, Any]): [description]
+            target_record_id (str): [description]
+
+        Returns:
+            Dict[str, Any]: [description]
+        """
+        flavor_data = {
+            "disk": int(target_flavor["storage-gb"]),
+            "ram": int(target_flavor["memory-mb"]),
+            "vcpus": int(target_flavor["vcpu-count"]),
+        }
+
+        target_vdur = {}
+        for vnf in indata.get("vnf", []):
+            for vdur in vnf.get("vdur", []):
+                if vdur.get("ns-flavor-id") == target_flavor["id"]:
+                    target_vdur = vdur
+
+        for storage in target_vdur.get("virtual-storages", []):
+            if (
+                storage.get("type-of-storage")
+                == "etsi-nfv-descriptors:ephemeral-storage"
+            ):
+                flavor_data["ephemeral"] = int(storage.get("size-of-storage", 0))
+            elif storage.get("type-of-storage") == "etsi-nfv-descriptors:swap-storage":
+                flavor_data["swap"] = int(storage.get("size-of-storage", 0))
+
+        extended = Ns._process_epa_params(target_flavor)
+        if extended:
+            flavor_data["extended"] = extended
+
+        extra_dict = {"find_params": {"flavor_data": flavor_data}}
+        flavor_data_name = flavor_data.copy()
+        flavor_data_name["name"] = target_flavor["name"]
+        extra_dict["params"] = {"flavor_data": flavor_data_name}
+
+        return extra_dict
+
+    @staticmethod
+    def _ip_profile_to_ro(
+        ip_profile: Dict[str, Any],
+    ) -> Dict[str, Any]:
+        """[summary]
+
+        Args:
+            ip_profile (Dict[str, Any]): [description]
+
+        Returns:
+            Dict[str, Any]: [description]
+        """
+        if not ip_profile:
+            return None
+
+        ro_ip_profile = {
+            "ip_version": "IPv4"
+            if "v4" in ip_profile.get("ip-version", "ipv4")
+            else "IPv6",
+            "subnet_address": ip_profile.get("subnet-address"),
+            "gateway_address": ip_profile.get("gateway-address"),
+            "dhcp_enabled": ip_profile.get("dhcp-params", {}).get("enabled", False),
+            "dhcp_start_address": ip_profile.get("dhcp-params", {}).get(
+                "start-address", None
+            ),
+            "dhcp_count": ip_profile.get("dhcp-params", {}).get("count", None),
+        }
+
+        if ip_profile.get("dns-server"):
+            ro_ip_profile["dns_address"] = ";".join(
+                [v["address"] for v in ip_profile["dns-server"] if v.get("address")]
+            )
+
+        if ip_profile.get("security-group"):
+            ro_ip_profile["security_group"] = ip_profile["security-group"]
+
+        return ro_ip_profile
+
+    @staticmethod
+    def _process_net_params(
+        target_vld: Dict[str, Any],
+        indata: Dict[str, Any],
+        vim_info: Dict[str, Any],
+        target_record_id: str,
+        **kwargs: Dict[str, Any],
+    ) -> Dict[str, Any]:
+        """Function to process network parameters.
+
+        Args:
+            target_vld (Dict[str, Any]): [description]
+            indata (Dict[str, Any]): [description]
+            vim_info (Dict[str, Any]): [description]
+            target_record_id (str): [description]
+
+        Returns:
+            Dict[str, Any]: [description]
+        """
+        extra_dict = {}
+
+        if vim_info.get("sdn"):
+            # vnf_preffix = "vnfrs:{}".format(vnfr_id)
+            # ns_preffix = "nsrs:{}".format(nsr_id)
+            # remove the ending ".sdn
+            vld_target_record_id, _, _ = target_record_id.rpartition(".")
+            extra_dict["params"] = {
+                k: vim_info[k]
+                for k in ("sdn-ports", "target_vim", "vlds", "type")
+                if vim_info.get(k)
+            }
+
+            # TODO needed to add target_id in the dependency.
+            if vim_info.get("target_vim"):
+                extra_dict["depends_on"] = [
+                    f"{vim_info.get('target_vim')} {vld_target_record_id}"
+                ]
+
+            return extra_dict
+
+        if vim_info.get("vim_network_name"):
+            extra_dict["find_params"] = {
+                "filter_dict": {
+                    "name": vim_info.get("vim_network_name"),
+                },
+            }
+        elif vim_info.get("vim_network_id"):
+            extra_dict["find_params"] = {
+                "filter_dict": {
+                    "id": vim_info.get("vim_network_id"),
+                },
+            }
+        elif target_vld.get("mgmt-network"):
+            extra_dict["find_params"] = {
+                "mgmt": True,
+                "name": target_vld["id"],
+            }
+        else:
+            # create
+            extra_dict["params"] = {
+                "net_name": (
+                    f"{indata.get('name')[:16]}-{target_vld.get('name', target_vld.get('id'))[:16]}"
+                ),
+                "ip_profile": Ns._ip_profile_to_ro(vim_info.get("ip_profile")),
+                "provider_network_profile": vim_info.get("provider_network"),
+            }
+
+            if not target_vld.get("underlay"):
+                extra_dict["params"]["net_type"] = "bridge"
+            else:
+                extra_dict["params"]["net_type"] = (
+                    "ptp" if target_vld.get("type") == "ELINE" else "data"
+                )
+
+        return extra_dict
+
+    @staticmethod
+    def _process_vdu_params(
+        target_vdu: Dict[str, Any],
+        indata: Dict[str, Any],
+        vim_info: Dict[str, Any],
+        target_record_id: str,
+        **kwargs: Dict[str, Any],
+    ) -> Dict[str, Any]:
+        """Function to process VDU parameters.
+
+        Args:
+            target_vdu (Dict[str, Any]): [description]
+            indata (Dict[str, Any]): [description]
+            vim_info (Dict[str, Any]): [description]
+            target_record_id (str): [description]
+
+        Returns:
+            Dict[str, Any]: [description]
+        """
+        vnfr_id = kwargs.get("vnfr_id")
+        nsr_id = kwargs.get("nsr_id")
+        vnfr = kwargs.get("vnfr")
+        vdu2cloud_init = kwargs.get("vdu2cloud_init")
+        tasks_by_target_record_id = kwargs.get("tasks_by_target_record_id")
+        logger = kwargs.get("logger")
+        db = kwargs.get("db")
+        fs = kwargs.get("fs")
+        ro_nsr_public_key = kwargs.get("ro_nsr_public_key")
+
+        vnf_preffix = "vnfrs:{}".format(vnfr_id)
+        ns_preffix = "nsrs:{}".format(nsr_id)
+        image_text = ns_preffix + ":image." + target_vdu["ns-image-id"]
+        flavor_text = ns_preffix + ":flavor." + target_vdu["ns-flavor-id"]
+        extra_dict = {"depends_on": [image_text, flavor_text]}
+        net_list = []
+
+        # If the position info is provided for all the interfaces, it will be sorted
+        # according to position number ascendingly.
+        if all(i.get("position") for i in target_vdu["interfaces"]):
+            sorted_interfaces = sorted(
+                target_vdu["interfaces"],
+                key=lambda x: (x.get("position") is None, x.get("position")),
+            )
+            target_vdu["interfaces"] = sorted_interfaces
+
+        # If the position info is provided for some interfaces but not all of them, the interfaces
+        # which has specific position numbers will be placed and others' positions will not be taken care.
+        else:
+            if any(i.get("position") for i in target_vdu["interfaces"]):
+                n = len(target_vdu["interfaces"])
+                sorted_interfaces = [-1] * n
+                k, m = 0, 0
+                while k < n:
+                    if target_vdu["interfaces"][k].get("position"):
+                        idx = target_vdu["interfaces"][k]["position"]
+                        sorted_interfaces[idx - 1] = target_vdu["interfaces"][k]
+                    k += 1
+                while m < n:
+                    if not target_vdu["interfaces"][m].get("position"):
+                        idy = sorted_interfaces.index(-1)
+                        sorted_interfaces[idy] = target_vdu["interfaces"][m]
+                    m += 1
+
+                target_vdu["interfaces"] = sorted_interfaces
+
+        # If the position info is not provided for the interfaces, interfaces will be attached
+        # according to the order in the VNFD.
+        for iface_index, interface in enumerate(target_vdu["interfaces"]):
+            if interface.get("ns-vld-id"):
+                net_text = ns_preffix + ":vld." + interface["ns-vld-id"]
+            elif interface.get("vnf-vld-id"):
+                net_text = vnf_preffix + ":vld." + interface["vnf-vld-id"]
+            else:
+                logger.error(
+                    "Interface {} from vdu {} not connected to any vld".format(
+                        iface_index, target_vdu["vdu-name"]
+                    )
+                )
+
+                continue  # interface not connected to any vld
+
+            extra_dict["depends_on"].append(net_text)
+
+            if "port-security-enabled" in interface:
+                interface["port_security"] = interface.pop("port-security-enabled")
+
+            if "port-security-disable-strategy" in interface:
+                interface["port_security_disable_strategy"] = interface.pop(
+                    "port-security-disable-strategy"
+                )
+
+            net_item = {
+                x: v
+                for x, v in interface.items()
+                if x
+                in (
+                    "name",
+                    "vpci",
+                    "port_security",
+                    "port_security_disable_strategy",
+                    "floating_ip",
+                )
+            }
+            net_item["net_id"] = "TASK-" + net_text
+            net_item["type"] = "virtual"
+
+            # TODO mac_address: used for  SR-IOV ifaces #TODO for other types
+            # TODO floating_ip: True/False (or it can be None)
+            if interface.get("type") in ("SR-IOV", "PCI-PASSTHROUGH"):
+                # mark the net create task as type data
+                if deep_get(
+                    tasks_by_target_record_id,
+                    net_text,
+                    "extra_dict",
+                    "params",
+                    "net_type",
+                ):
+                    tasks_by_target_record_id[net_text]["extra_dict"]["params"][
+                        "net_type"
+                    ] = "data"
+
+                net_item["use"] = "data"
+                net_item["model"] = interface["type"]
+                net_item["type"] = interface["type"]
+            elif (
+                interface.get("type") == "OM-MGMT"
+                or interface.get("mgmt-interface")
+                or interface.get("mgmt-vnf")
+            ):
+                net_item["use"] = "mgmt"
+            else:
+                # if interface.get("type") in ("VIRTIO", "E1000", "PARAVIRT"):
+                net_item["use"] = "bridge"
+                net_item["model"] = interface.get("type")
+
+            if interface.get("ip-address"):
+                net_item["ip_address"] = interface["ip-address"]
+
+            if interface.get("mac-address"):
+                net_item["mac_address"] = interface["mac-address"]
+
+            net_list.append(net_item)
+
+            if interface.get("mgmt-vnf"):
+                extra_dict["mgmt_vnf_interface"] = iface_index
+            elif interface.get("mgmt-interface"):
+                extra_dict["mgmt_vdu_interface"] = iface_index
+
+        # cloud config
+        cloud_config = {}
+
+        if target_vdu.get("cloud-init"):
+            if target_vdu["cloud-init"] not in vdu2cloud_init:
+                vdu2cloud_init[target_vdu["cloud-init"]] = Ns._get_cloud_init(
+                    db=db,
+                    fs=fs,
+                    location=target_vdu["cloud-init"],
+                )
+
+            cloud_content_ = vdu2cloud_init[target_vdu["cloud-init"]]
+            cloud_config["user-data"] = Ns._parse_jinja2(
+                cloud_init_content=cloud_content_,
+                params=target_vdu.get("additionalParams"),
+                context=target_vdu["cloud-init"],
+            )
+
+        if target_vdu.get("boot-data-drive"):
+            cloud_config["boot-data-drive"] = target_vdu.get("boot-data-drive")
+
+        ssh_keys = []
+
+        if target_vdu.get("ssh-keys"):
+            ssh_keys += target_vdu.get("ssh-keys")
+
+        if target_vdu.get("ssh-access-required"):
+            ssh_keys.append(ro_nsr_public_key)
+
+        if ssh_keys:
+            cloud_config["key-pairs"] = ssh_keys
+
+        persistent_root_disk = {}
+        disk_list = []
+        vnfd_id = vnfr["vnfd-id"]
+        vnfd = db.get_one("vnfds", {"_id": vnfd_id})
+        for vdu in vnfd.get("vdu", ()):
+            if vdu["name"] == target_vdu["vdu-name"]:
+                for vsd in vnfd.get("virtual-storage-desc", ()):
+                    if vsd.get("id") == vdu.get("virtual-storage-desc", [[]])[0]:
+                        root_disk = vsd
+                        if root_disk.get(
+                            "type-of-storage"
+                        ) == "persistent-storage:persistent-storage" and root_disk.get(
+                            "size-of-storage"
+                        ):
+                            persistent_root_disk[vsd["id"]] = {
+                                "image_id": vdu.get("sw-image-desc"),
+                                "size": root_disk["size-of-storage"],
+                            }
+                            disk_list.append(persistent_root_disk[vsd["id"]])
+
+        if target_vdu.get("virtual-storages"):
+            for disk in target_vdu["virtual-storages"]:
+                if (
+                    disk.get("type-of-storage")
+                    == "persistent-storage:persistent-storage"
+                    and disk["id"] not in persistent_root_disk.keys()
+                ):
+                    disk_list.append({"size": disk["size-of-storage"]})
+
+        affinity_group_list = []
+
+        if target_vdu.get("affinity-or-anti-affinity-group-id"):
+            affinity_group = {}
+            for affinity_group_id in target_vdu["affinity-or-anti-affinity-group-id"]:
+                affinity_group_text = (
+                    ns_preffix + ":affinity-or-anti-affinity-group." + affinity_group_id
+                )
+
+                extra_dict["depends_on"].append(affinity_group_text)
+                affinity_group["affinity_group_id"] = "TASK-" + affinity_group_text
+                affinity_group_list.append(affinity_group)
+
+        extra_dict["params"] = {
+            "name": "{}-{}-{}-{}".format(
+                indata["name"][:16],
+                vnfr["member-vnf-index-ref"][:16],
+                target_vdu["vdu-name"][:32],
+                target_vdu.get("count-index") or 0,
+            ),
+            "description": target_vdu["vdu-name"],
+            "start": True,
+            "image_id": "TASK-" + image_text,
+            "flavor_id": "TASK-" + flavor_text,
+            "affinity_group_list": affinity_group_list,
+            "net_list": net_list,
+            "cloud_config": cloud_config or None,
+            "disk_list": disk_list,
+            "availability_zone_index": None,  # TODO
+            "availability_zone_list": None,  # TODO
+        }
+
+        return extra_dict
+
+    @staticmethod
+    def _process_affinity_group_params(
+        target_affinity_group: Dict[str, Any],
+        indata: Dict[str, Any],
+        vim_info: Dict[str, Any],
+        target_record_id: str,
+        **kwargs: Dict[str, Any],
+    ) -> Dict[str, Any]:
+        """Get affinity or anti-affinity group parameters.
+
+        Args:
+            target_affinity_group (Dict[str, Any]): [description]
+            indata (Dict[str, Any]): [description]
+            vim_info (Dict[str, Any]): [description]
+            target_record_id (str): [description]
+
+        Returns:
+            Dict[str, Any]: [description]
+        """
+
+        extra_dict = {}
+        affinity_group_data = {
+            "name": target_affinity_group["name"],
+            "type": target_affinity_group["type"],
+            "scope": target_affinity_group["scope"],
+        }
+
+        if target_affinity_group.get("vim-affinity-group-id"):
+            affinity_group_data["vim-affinity-group-id"] = target_affinity_group[
+                "vim-affinity-group-id"
+            ]
+
+        extra_dict["params"] = {
+            "affinity_group_data": affinity_group_data,
+        }
+
+        return extra_dict
+
+    @staticmethod
+    def _process_recreate_vdu_params(
+        existing_vdu: Dict[str, Any],
+        db_nsr: Dict[str, Any],
+        vim_info: Dict[str, Any],
+        target_record_id: str,
+        target_id: str,
+        **kwargs: Dict[str, Any],
+    ) -> Dict[str, Any]:
+        """Function to process VDU parameters to recreate.
+
+        Args:
+            existing_vdu (Dict[str, Any]): [description]
+            db_nsr (Dict[str, Any]): [description]
+            vim_info (Dict[str, Any]): [description]
+            target_record_id (str): [description]
+            target_id (str): [description]
+
+        Returns:
+            Dict[str, Any]: [description]
+        """
+        vnfr = kwargs.get("vnfr")
+        vdu2cloud_init = kwargs.get("vdu2cloud_init")
+        # logger = kwargs.get("logger")
+        db = kwargs.get("db")
+        fs = kwargs.get("fs")
+        ro_nsr_public_key = kwargs.get("ro_nsr_public_key")
+
+        extra_dict = {}
+        net_list = []
+
+        vim_details = {}
+        vim_details_text = existing_vdu["vim_info"][target_id].get("vim_details", None)
+        if vim_details_text:
+            vim_details = yaml.safe_load(f"{vim_details_text}")
+
+        for iface_index, interface in enumerate(existing_vdu["interfaces"]):
+
+            if "port-security-enabled" in interface:
+                interface["port_security"] = interface.pop("port-security-enabled")
+
+            if "port-security-disable-strategy" in interface:
+                interface["port_security_disable_strategy"] = interface.pop(
+                    "port-security-disable-strategy"
+                )
+
+            net_item = {
+                x: v
+                for x, v in interface.items()
+                if x
+                in (
+                    "name",
+                    "vpci",
+                    "port_security",
+                    "port_security_disable_strategy",
+                    "floating_ip",
+                )
+            }
+            existing_ifaces = existing_vdu["vim_info"][target_id].get(
+                "interfaces_backup", []
+            )
+            net_id = next(
+                (
+                    i["vim_net_id"]
+                    for i in existing_ifaces
+                    if i["ip_address"] == interface["ip-address"]
+                ),
+                None,
+            )
+
+            net_item["net_id"] = net_id
+            net_item["type"] = "virtual"
+
+            # TODO mac_address: used for  SR-IOV ifaces #TODO for other types
+            # TODO floating_ip: True/False (or it can be None)
+            if interface.get("type") in ("SR-IOV", "PCI-PASSTHROUGH"):
+                net_item["use"] = "data"
+                net_item["model"] = interface["type"]
+                net_item["type"] = interface["type"]
+            elif (
+                interface.get("type") == "OM-MGMT"
+                or interface.get("mgmt-interface")
+                or interface.get("mgmt-vnf")
+            ):
+                net_item["use"] = "mgmt"
+            else:
+                # if interface.get("type") in ("VIRTIO", "E1000", "PARAVIRT"):
+                net_item["use"] = "bridge"
+                net_item["model"] = interface.get("type")
+
+            if interface.get("ip-address"):
+                net_item["ip_address"] = interface["ip-address"]
+
+            if interface.get("mac-address"):
+                net_item["mac_address"] = interface["mac-address"]
+
+            net_list.append(net_item)
+
+            if interface.get("mgmt-vnf"):
+                extra_dict["mgmt_vnf_interface"] = iface_index
+            elif interface.get("mgmt-interface"):
+                extra_dict["mgmt_vdu_interface"] = iface_index
+
+        # cloud config
+        cloud_config = {}
+
+        if existing_vdu.get("cloud-init"):
+            if existing_vdu["cloud-init"] not in vdu2cloud_init:
+                vdu2cloud_init[existing_vdu["cloud-init"]] = Ns._get_cloud_init(
+                    db=db,
+                    fs=fs,
+                    location=existing_vdu["cloud-init"],
+                )
+
+            cloud_content_ = vdu2cloud_init[existing_vdu["cloud-init"]]
+            cloud_config["user-data"] = Ns._parse_jinja2(
+                cloud_init_content=cloud_content_,
+                params=existing_vdu.get("additionalParams"),
+                context=existing_vdu["cloud-init"],
+            )
+
+        if existing_vdu.get("boot-data-drive"):
+            cloud_config["boot-data-drive"] = existing_vdu.get("boot-data-drive")
+
+        ssh_keys = []
+
+        if existing_vdu.get("ssh-keys"):
+            ssh_keys += existing_vdu.get("ssh-keys")
+
+        if existing_vdu.get("ssh-access-required"):
+            ssh_keys.append(ro_nsr_public_key)
+
+        if ssh_keys:
+            cloud_config["key-pairs"] = ssh_keys
+
+        disk_list = []
+        for vol_id in vim_details.get("os-extended-volumes:volumes_attached", []):
+            disk_list.append({"vim_id": vol_id["id"]})
+
+        affinity_group_list = []
+
+        if existing_vdu.get("affinity-or-anti-affinity-group-id"):
+            affinity_group = {}
+            for affinity_group_id in existing_vdu["affinity-or-anti-affinity-group-id"]:
+                for group in db_nsr.get("affinity-or-anti-affinity-group"):
+                    if (
+                        group["id"] == affinity_group_id
+                        and group["vim_info"][target_id].get("vim_id", None) is not None
+                    ):
+                        affinity_group["affinity_group_id"] = group["vim_info"][
+                            target_id
+                        ].get("vim_id", None)
+                        affinity_group_list.append(affinity_group)
+
+        extra_dict["params"] = {
+            "name": "{}-{}-{}-{}".format(
+                db_nsr["name"][:16],
+                vnfr["member-vnf-index-ref"][:16],
+                existing_vdu["vdu-name"][:32],
+                existing_vdu.get("count-index") or 0,
+            ),
+            "description": existing_vdu["vdu-name"],
+            "start": True,
+            "image_id": vim_details["image"]["id"],
+            "flavor_id": vim_details["flavor"]["id"],
+            "affinity_group_list": affinity_group_list,
+            "net_list": net_list,
+            "cloud_config": cloud_config or None,
+            "disk_list": disk_list,
+            "availability_zone_index": None,  # TODO
+            "availability_zone_list": None,  # TODO
+        }
+
+        return extra_dict
+
+    def calculate_diff_items(
+        self,
+        indata,
+        db_nsr,
+        db_ro_nsr,
+        db_nsr_update,
+        item,
+        tasks_by_target_record_id,
+        action_id,
+        nsr_id,
+        task_index,
+        vnfr_id=None,
+        vnfr=None,
+    ):
+        """Function that returns the incremental changes (creation, deletion)
+        related to a specific item `item` to be done. This function should be
+        called for NS instantiation, NS termination, NS update to add a new VNF
+        or a new VLD, remove a VNF or VLD, etc.
+        Item can be `net`, `flavor`, `image` or `vdu`.
+        It takes a list of target items from indata (which came from the REST API)
+        and compares with the existing items from db_ro_nsr, identifying the
+        incremental changes to be done. During the comparison, it calls the method
+        `process_params` (which was passed as parameter, and is particular for each
+        `item`)
+
+        Args:
+            indata (Dict[str, Any]): deployment info
+            db_nsr: NSR record from DB
+            db_ro_nsr (Dict[str, Any]): record from "ro_nsrs"
+            db_nsr_update (Dict[str, Any]): NSR info to update in DB
+            item (str): element to process (net, vdu...)
+            tasks_by_target_record_id (Dict[str, Any]):
+                [<target_record_id>, <task>]
+            action_id (str): action id
+            nsr_id (str): NSR id
+            task_index (number): task index to add to task name
+            vnfr_id (str): VNFR id
+            vnfr (Dict[str, Any]): VNFR info
+
+        Returns:
+            List: list with the incremental changes (deletes, creates) for each item
+            number: current task index
+        """
+
+        diff_items = []
+        db_path = ""
+        db_record = ""
+        target_list = []
+        existing_list = []
+        process_params = None
+        vdu2cloud_init = indata.get("cloud_init_content") or {}
+        ro_nsr_public_key = db_ro_nsr["public_key"]
+
+        # According to the type of item, the path, the target_list,
+        # the existing_list and the method to process params are set
+        db_path = self.db_path_map[item]
+        process_params = self.process_params_function_map[item]
+        if item in ("net", "vdu"):
+            # This case is specific for the NS VLD (not applied to VDU)
+            if vnfr is None:
+                db_record = "nsrs:{}:{}".format(nsr_id, db_path)
+                target_list = indata.get("ns", []).get(db_path, [])
+                existing_list = db_nsr.get(db_path, [])
+            # This case is common for VNF VLDs and VNF VDUs
+            else:
+                db_record = "vnfrs:{}:{}".format(vnfr_id, db_path)
+                target_vnf = next(
+                    (vnf for vnf in indata.get("vnf", ()) if vnf["_id"] == vnfr_id),
+                    None,
+                )
+                target_list = target_vnf.get(db_path, []) if target_vnf else []
+                existing_list = vnfr.get(db_path, [])
+        elif item in ("image", "flavor", "affinity-or-anti-affinity-group"):
+            db_record = "nsrs:{}:{}".format(nsr_id, db_path)
+            target_list = indata.get(item, [])
+            existing_list = db_nsr.get(item, [])
+        else:
+            raise NsException("Item not supported: {}", item)
+
+        # ensure all the target_list elements has an "id". If not assign the index as id
+        if target_list is None:
+            target_list = []
+        for target_index, tl in enumerate(target_list):
+            if tl and not tl.get("id"):
+                tl["id"] = str(target_index)
+
+        # step 1 items (networks,vdus,...) to be deleted/updated
+        for item_index, existing_item in enumerate(existing_list):
+            target_item = next(
+                (t for t in target_list if t["id"] == existing_item["id"]),
+                None,
+            )
+
+            for target_vim, existing_viminfo in existing_item.get(
+                "vim_info", {}
+            ).items():
+                if existing_viminfo is None:
+                    continue
+
+                if target_item:
+                    target_viminfo = target_item.get("vim_info", {}).get(target_vim)
+                else:
+                    target_viminfo = None
+
+                if target_viminfo is None:
+                    # must be deleted
+                    self._assign_vim(target_vim)
+                    target_record_id = "{}.{}".format(db_record, existing_item["id"])
+                    item_ = item
+
+                    if target_vim.startswith("sdn"):
+                        # item must be sdn-net instead of net if target_vim is a sdn
+                        item_ = "sdn_net"
+                        target_record_id += ".sdn"
+
+                    deployment_info = {
+                        "action_id": action_id,
+                        "nsr_id": nsr_id,
+                        "task_index": task_index,
+                    }
+
+                    diff_items.append(
+                        {
+                            "deployment_info": deployment_info,
+                            "target_id": target_vim,
+                            "item": item_,
+                            "action": "DELETE",
+                            "target_record": f"{db_record}.{item_index}.vim_info.{target_vim}",
+                            "target_record_id": target_record_id,
+                        }
+                    )
+                    task_index += 1
+
+        # step 2 items (networks,vdus,...) to be created
+        for target_item in target_list:
+            item_index = -1
+
+            for item_index, existing_item in enumerate(existing_list):
+                if existing_item["id"] == target_item["id"]:
+                    break
+            else:
+                item_index += 1
+                db_nsr_update[db_path + ".{}".format(item_index)] = target_item
+                existing_list.append(target_item)
+                existing_item = None
+
+            for target_vim, target_viminfo in target_item.get("vim_info", {}).items():
+                existing_viminfo = None
+
+                if existing_item:
+                    existing_viminfo = existing_item.get("vim_info", {}).get(target_vim)
+
+                if existing_viminfo is not None:
+                    continue
+
+                target_record_id = "{}.{}".format(db_record, target_item["id"])
+                item_ = item
+
+                if target_vim.startswith("sdn"):
+                    # item must be sdn-net instead of net if target_vim is a sdn
+                    item_ = "sdn_net"
+                    target_record_id += ".sdn"
+
+                kwargs = {}
+                self.logger.warning(
+                    "ns.calculate_diff_items target_item={}".format(target_item)
+                )
+                if process_params == Ns._process_vdu_params:
+                    self.logger.warning(
+                        "calculate_diff_items self.fs={}".format(self.fs)
+                    )
+                    kwargs.update(
+                        {
+                            "vnfr_id": vnfr_id,
+                            "nsr_id": nsr_id,
+                            "vnfr": vnfr,
+                            "vdu2cloud_init": vdu2cloud_init,
+                            "tasks_by_target_record_id": tasks_by_target_record_id,
+                            "logger": self.logger,
+                            "db": self.db,
+                            "fs": self.fs,
+                            "ro_nsr_public_key": ro_nsr_public_key,
+                        }
+                    )
+                    self.logger.warning("calculate_diff_items kwargs={}".format(kwargs))
+
+                extra_dict = process_params(
+                    target_item,
+                    indata,
+                    target_viminfo,
+                    target_record_id,
+                    **kwargs,
+                )
+                self._assign_vim(target_vim)
+
+                deployment_info = {
+                    "action_id": action_id,
+                    "nsr_id": nsr_id,
+                    "task_index": task_index,
+                }
+
+                new_item = {
+                    "deployment_info": deployment_info,
+                    "target_id": target_vim,
+                    "item": item_,
+                    "action": "CREATE",
+                    "target_record": f"{db_record}.{item_index}.vim_info.{target_vim}",
+                    "target_record_id": target_record_id,
+                    "extra_dict": extra_dict,
+                    "common_id": target_item.get("common_id", None),
+                }
+                diff_items.append(new_item)
+                tasks_by_target_record_id[target_record_id] = new_item
+                task_index += 1
+
+                db_nsr_update[db_path + ".{}".format(item_index)] = target_item
+
+        return diff_items, task_index
+
+    def calculate_all_differences_to_deploy(
+        self,
+        indata,
+        nsr_id,
+        db_nsr,
+        db_vnfrs,
+        db_ro_nsr,
+        db_nsr_update,
+        db_vnfrs_update,
+        action_id,
+        tasks_by_target_record_id,
+    ):
+        """This method calculates the ordered list of items (`changes_list`)
+        to be created and deleted.
+
+        Args:
+            indata (Dict[str, Any]): deployment info
+            nsr_id (str): NSR id
+            db_nsr: NSR record from DB
+            db_vnfrs: VNFRS record from DB
+            db_ro_nsr (Dict[str, Any]): record from "ro_nsrs"
+            db_nsr_update (Dict[str, Any]): NSR info to update in DB
+            db_vnfrs_update (Dict[str, Any]): VNFRS info to update in DB
+            action_id (str): action id
+            tasks_by_target_record_id (Dict[str, Any]):
+                [<target_record_id>, <task>]
+
+        Returns:
+            List: ordered list of items to be created and deleted.
+        """
+
+        task_index = 0
+        # set list with diffs:
+        changes_list = []
+
+        # NS vld, image and flavor
+        for item in ["net", "image", "flavor", "affinity-or-anti-affinity-group"]:
+            self.logger.debug("process NS={} {}".format(nsr_id, item))
+            diff_items, task_index = self.calculate_diff_items(
+                indata=indata,
+                db_nsr=db_nsr,
+                db_ro_nsr=db_ro_nsr,
+                db_nsr_update=db_nsr_update,
+                item=item,
+                tasks_by_target_record_id=tasks_by_target_record_id,
+                action_id=action_id,
+                nsr_id=nsr_id,
+                task_index=task_index,
+                vnfr_id=None,
+            )
+            changes_list += diff_items
+
+        # VNF vlds and vdus
+        for vnfr_id, vnfr in db_vnfrs.items():
+            # vnfr_id need to be set as global variable for among others nested method _process_vdu_params
+            for item in ["net", "vdu"]:
+                self.logger.debug("process VNF={} {}".format(vnfr_id, item))
+                diff_items, task_index = self.calculate_diff_items(
+                    indata=indata,
+                    db_nsr=db_nsr,
+                    db_ro_nsr=db_ro_nsr,
+                    db_nsr_update=db_vnfrs_update[vnfr["_id"]],
+                    item=item,
+                    tasks_by_target_record_id=tasks_by_target_record_id,
+                    action_id=action_id,
+                    nsr_id=nsr_id,
+                    task_index=task_index,
+                    vnfr_id=vnfr_id,
+                    vnfr=vnfr,
+                )
+                changes_list += diff_items
+
+        return changes_list
+
+    def define_all_tasks(
+        self,
+        changes_list,
+        db_new_tasks,
+        tasks_by_target_record_id,
+    ):
+        """Function to create all the task structures obtanied from
+        the method calculate_all_differences_to_deploy
+
+        Args:
+            changes_list (List): ordered list of items to be created or deleted
+            db_new_tasks (List): tasks list to be created
+            action_id (str): action id
+            tasks_by_target_record_id (Dict[str, Any]):
+                [<target_record_id>, <task>]
+
+        """
+
+        for change in changes_list:
+            task = Ns._create_task(
+                deployment_info=change["deployment_info"],
+                target_id=change["target_id"],
+                item=change["item"],
+                action=change["action"],
+                target_record=change["target_record"],
+                target_record_id=change["target_record_id"],
+                extra_dict=change.get("extra_dict", None),
+            )
+
+            self.logger.warning("ns.define_all_tasks task={}".format(task))
+            tasks_by_target_record_id[change["target_record_id"]] = task
+            db_new_tasks.append(task)
+
+            if change.get("common_id"):
+                task["common_id"] = change["common_id"]
+
+    def upload_all_tasks(
+        self,
+        db_new_tasks,
+        now,
+    ):
+        """Function to save all tasks in the common DB
+
+        Args:
+            db_new_tasks (List): tasks list to be created
+            now (time): current time
+
+        """
+
+        nb_ro_tasks = 0  # for logging
+
+        for db_task in db_new_tasks:
+            target_id = db_task.pop("target_id")
+            common_id = db_task.get("common_id")
+
+            # Do not chek tasks with vim_status DELETED
+            # because in manual heealing there are two tasks for the same vdur:
+            #   one with vim_status deleted and the other one with the actual VM status.
+
+            if common_id:
+                if self.db.set_one(
+                    "ro_tasks",
+                    q_filter={
+                        "target_id": target_id,
+                        "tasks.common_id": common_id,
+                        "vim_info.vim_status.ne": "DELETED",
+                    },
+                    update_dict={"to_check_at": now, "modified_at": now},
+                    push={"tasks": db_task},
+                    fail_on_empty=False,
+                ):
+                    continue
+
+            if not self.db.set_one(
+                "ro_tasks",
+                q_filter={
+                    "target_id": target_id,
+                    "tasks.target_record": db_task["target_record"],
+                    "vim_info.vim_status.ne": "DELETED",
+                },
+                update_dict={"to_check_at": now, "modified_at": now},
+                push={"tasks": db_task},
+                fail_on_empty=False,
+            ):
+                # Create a ro_task
+                self.logger.debug("Updating database, Creating ro_tasks")
+                db_ro_task = Ns._create_ro_task(target_id, db_task)
+                nb_ro_tasks += 1
+                self.db.create("ro_tasks", db_ro_task)
+
+        self.logger.debug(
+            "Created {} ro_tasks; {} tasks - db_new_tasks={}".format(
+                nb_ro_tasks, len(db_new_tasks), db_new_tasks
+            )
+        )
+
+    def upload_recreate_tasks(
+        self,
+        db_new_tasks,
+        now,
+    ):
+        """Function to save recreate tasks in the common DB
+
+        Args:
+            db_new_tasks (List): tasks list to be created
+            now (time): current time
+
+        """
+
+        nb_ro_tasks = 0  # for logging
+
+        for db_task in db_new_tasks:
+            target_id = db_task.pop("target_id")
+            self.logger.warning("target_id={} db_task={}".format(target_id, db_task))
+
+            action = db_task.get("action", None)
+
+            # Create a ro_task
+            self.logger.debug("Updating database, Creating ro_tasks")
+            db_ro_task = Ns._create_ro_task(target_id, db_task)
+
+            # If DELETE task: the associated created items should be removed
+            # (except persistent volumes):
+            if action == "DELETE":
+                db_ro_task["vim_info"]["created"] = True
+                db_ro_task["vim_info"]["created_items"] = db_task.get(
+                    "created_items", {}
+                )
+                db_ro_task["vim_info"]["volumes_to_hold"] = db_task.get(
+                    "volumes_to_hold", []
+                )
+                db_ro_task["vim_info"]["vim_id"] = db_task.get("vim_id", None)
+
+            nb_ro_tasks += 1
+            self.logger.warning("upload_all_tasks db_ro_task={}".format(db_ro_task))
+            self.db.create("ro_tasks", db_ro_task)
+
+        self.logger.debug(
+            "Created {} ro_tasks; {} tasks - db_new_tasks={}".format(
+                nb_ro_tasks, len(db_new_tasks), db_new_tasks
+            )
+        )
+
+    def _prepare_created_items_for_healing(
+        self,
+        nsr_id,
+        target_record,
+    ):
+        created_items = {}
+        # Get created_items from ro_task
+        ro_tasks = self.db.get_list("ro_tasks", {"tasks.nsr_id": nsr_id})
+        for ro_task in ro_tasks:
+            for task in ro_task["tasks"]:
+                if (
+                    task["target_record"] == target_record
+                    and task["action"] == "CREATE"
+                    and ro_task["vim_info"]["created_items"]
+                ):
+                    created_items = ro_task["vim_info"]["created_items"]
+                    break
+
+        return created_items
+
+    def _prepare_persistent_volumes_for_healing(
+        self,
+        target_id,
+        existing_vdu,
+    ):
+        # The associated volumes of the VM shouldn't be removed
+        volumes_list = []
+        vim_details = {}
+        vim_details_text = existing_vdu["vim_info"][target_id].get("vim_details", None)
+        if vim_details_text:
+            vim_details = yaml.safe_load(f"{vim_details_text}")
+
+            for vol_id in vim_details.get("os-extended-volumes:volumes_attached", []):
+                volumes_list.append(vol_id["id"])
+
+        return volumes_list
+
+    def prepare_changes_to_recreate(
+        self,
+        indata,
+        nsr_id,
+        db_nsr,
+        db_vnfrs,
+        db_ro_nsr,
+        action_id,
+        tasks_by_target_record_id,
+    ):
+        """This method will obtain an ordered list of items (`changes_list`)
+        to be created and deleted to meet the recreate request.
+        """
+
+        self.logger.debug(
+            "ns.prepare_changes_to_recreate nsr_id={} indata={}".format(nsr_id, indata)
+        )
+
+        task_index = 0
+        # set list with diffs:
+        changes_list = []
+        db_path = self.db_path_map["vdu"]
+        target_list = indata.get("healVnfData", {})
+        vdu2cloud_init = indata.get("cloud_init_content") or {}
+        ro_nsr_public_key = db_ro_nsr["public_key"]
+
+        # Check each VNF of the target
+        for target_vnf in target_list:
+            # Find this VNF in the list from DB
+            vnfr_id = target_vnf.get("vnfInstanceId", None)
+            if vnfr_id:
+                existing_vnf = db_vnfrs.get(vnfr_id)
+                db_record = "vnfrs:{}:{}".format(vnfr_id, db_path)
+                # vim_account_id = existing_vnf.get("vim-account-id", "")
+
+            # Check each VDU of this VNF
+            for target_vdu in target_vnf["additionalParams"].get("vdu", None):
+                vdu_name = target_vdu.get("vdu-id", None)
+                # For multi instance VDU count-index is mandatory
+                # For single session VDU count-indes is 0
+                count_index = target_vdu.get("count-index", 0)
+                item_index = 0
+                existing_instance = None
+                for instance in existing_vnf.get("vdur", None):
+                    if (
+                        instance["vdu-name"] == vdu_name
+                        and instance["count-index"] == count_index
+                    ):
+                        existing_instance = instance
+                        break
+                    else:
+                        item_index += 1
+
+                target_record_id = "{}.{}".format(db_record, existing_instance["id"])
+
+                # The target VIM is the one already existing in DB to recreate
+                for target_vim, target_viminfo in existing_instance.get(
+                    "vim_info", {}
+                ).items():
+                    # step 1 vdu to be deleted
+                    self._assign_vim(target_vim)
+                    deployment_info = {
+                        "action_id": action_id,
+                        "nsr_id": nsr_id,
+                        "task_index": task_index,
+                    }
+
+                    target_record = f"{db_record}.{item_index}.vim_info.{target_vim}"
+                    created_items = self._prepare_created_items_for_healing(
+                        nsr_id, target_record
+                    )
+
+                    volumes_to_hold = self._prepare_persistent_volumes_for_healing(
+                        target_vim, existing_instance
+                    )
+
+                    # Specific extra params for recreate tasks:
+                    extra_dict = {
+                        "created_items": created_items,
+                        "vim_id": existing_instance["vim-id"],
+                        "volumes_to_hold": volumes_to_hold,
+                    }
+
+                    changes_list.append(
+                        {
+                            "deployment_info": deployment_info,
+                            "target_id": target_vim,
+                            "item": "vdu",
+                            "action": "DELETE",
+                            "target_record": target_record,
+                            "target_record_id": target_record_id,
+                            "extra_dict": extra_dict,
+                        }
+                    )
+                    delete_task_id = f"{action_id}:{task_index}"
+                    task_index += 1
+
+                    # step 2 vdu to be created
+                    kwargs = {}
+                    kwargs.update(
+                        {
+                            "vnfr_id": vnfr_id,
+                            "nsr_id": nsr_id,
+                            "vnfr": existing_vnf,
+                            "vdu2cloud_init": vdu2cloud_init,
+                            "tasks_by_target_record_id": tasks_by_target_record_id,
+                            "logger": self.logger,
+                            "db": self.db,
+                            "fs": self.fs,
+                            "ro_nsr_public_key": ro_nsr_public_key,
+                        }
+                    )
+
+                    extra_dict = self._process_recreate_vdu_params(
+                        existing_instance,
+                        db_nsr,
+                        target_viminfo,
+                        target_record_id,
+                        target_vim,
+                        **kwargs,
+                    )
+
+                    # The CREATE task depens on the DELETE task
+                    extra_dict["depends_on"] = [delete_task_id]
+
+                    # Add volumes created from created_items if any
+                    # Ports should be deleted with delete task and automatically created with create task
+                    volumes = {}
+                    for k, v in created_items.items():
+                        try:
+                            k_item, _, k_id = k.partition(":")
+                            if k_item == "volume":
+                                volumes[k] = v
+                        except Exception as e:
+                            self.logger.error(
+                                "Error evaluating created item {}: {}".format(k, e)
+                            )
+                    extra_dict["previous_created_volumes"] = volumes
+
+                    deployment_info = {
+                        "action_id": action_id,
+                        "nsr_id": nsr_id,
+                        "task_index": task_index,
+                    }
+                    self._assign_vim(target_vim)
+
+                    new_item = {
+                        "deployment_info": deployment_info,
+                        "target_id": target_vim,
+                        "item": "vdu",
+                        "action": "CREATE",
+                        "target_record": target_record,
+                        "target_record_id": target_record_id,
+                        "extra_dict": extra_dict,
+                    }
+                    changes_list.append(new_item)
+                    tasks_by_target_record_id[target_record_id] = new_item
+                    task_index += 1
+
+        return changes_list
+
+    def recreate(self, session, indata, version, nsr_id, *args, **kwargs):
+        self.logger.debug("ns.recreate nsr_id={} indata={}".format(nsr_id, indata))
+        # TODO: validate_input(indata, recreate_schema)
+        action_id = indata.get("action_id", str(uuid4()))
+        # get current deployment
+        db_vnfrs = {}  # vnf's info indexed by _id
+        step = ""
+        logging_text = "Recreate nsr_id={} action_id={} indata={}".format(
+            nsr_id, action_id, indata
+        )
+        self.logger.debug(logging_text + "Enter")
+
+        try:
+            step = "Getting ns and vnfr record from db"
+            db_nsr = self.db.get_one("nsrs", {"_id": nsr_id})
+            db_new_tasks = []
+            tasks_by_target_record_id = {}
+            # read from db: vnf's of this ns
+            step = "Getting vnfrs from db"
+            db_vnfrs_list = self.db.get_list("vnfrs", {"nsr-id-ref": nsr_id})
+            self.logger.debug("ns.recreate: db_vnfrs_list={}".format(db_vnfrs_list))
+
+            if not db_vnfrs_list:
+                raise NsException("Cannot obtain associated VNF for ns")
+
+            for vnfr in db_vnfrs_list:
+                db_vnfrs[vnfr["_id"]] = vnfr
+
+            now = time()
+            db_ro_nsr = self.db.get_one("ro_nsrs", {"_id": nsr_id}, fail_on_empty=False)
+            self.logger.debug("ns.recreate: db_ro_nsr={}".format(db_ro_nsr))
+
+            if not db_ro_nsr:
+                db_ro_nsr = self._create_db_ro_nsrs(nsr_id, now)
+
+            with self.write_lock:
+                # NS
+                step = "process NS elements"
+                changes_list = self.prepare_changes_to_recreate(
+                    indata=indata,
+                    nsr_id=nsr_id,
+                    db_nsr=db_nsr,
+                    db_vnfrs=db_vnfrs,
+                    db_ro_nsr=db_ro_nsr,
+                    action_id=action_id,
+                    tasks_by_target_record_id=tasks_by_target_record_id,
+                )
+
+                self.define_all_tasks(
+                    changes_list=changes_list,
+                    db_new_tasks=db_new_tasks,
+                    tasks_by_target_record_id=tasks_by_target_record_id,
+                )
+
+                # Delete all ro_tasks registered for the targets vdurs (target_record)
+                # If task of type CREATE exist then vim will try to get info form deleted VMs.
+                # So remove all task related to target record.
+                ro_tasks = self.db.get_list("ro_tasks", {"tasks.nsr_id": nsr_id})
+                for change in changes_list:
+                    for ro_task in ro_tasks:
+                        for task in ro_task["tasks"]:
+                            if task["target_record"] == change["target_record"]:
+                                self.db.del_one(
+                                    "ro_tasks",
+                                    q_filter={
+                                        "_id": ro_task["_id"],
+                                        "modified_at": ro_task["modified_at"],
+                                    },
+                                    fail_on_empty=False,
+                                )
+
+                step = "Updating database, Appending tasks to ro_tasks"
+                self.upload_recreate_tasks(
+                    db_new_tasks=db_new_tasks,
+                    now=now,
+                )
+
+            self.logger.debug(
+                logging_text + "Exit. Created {} tasks".format(len(db_new_tasks))
+            )
+
+            return (
+                {"status": "ok", "nsr_id": nsr_id, "action_id": action_id},
+                action_id,
+                True,
+            )
+        except Exception as e:
+            if isinstance(e, (DbException, NsException)):
+                self.logger.error(
+                    logging_text + "Exit Exception while '{}': {}".format(step, e)
+                )
+            else:
+                e = traceback_format_exc()
+                self.logger.critical(
+                    logging_text + "Exit Exception while '{}': {}".format(step, e),
+                    exc_info=True,
+                )
+
+            raise NsException(e)
+
     def deploy(self, session, indata, version, nsr_id, *args, **kwargs):
         self.logger.debug("ns.deploy nsr_id={} indata={}".format(nsr_id, indata))
         validate_input(indata, deploy_schema)
         action_id = indata.get("action_id", str(uuid4()))
         task_index = 0
         # get current deployment
-        db_nsr_update = {}        # update operation on nsrs
+        db_nsr_update = {}  # update operation on nsrs
         db_vnfrs_update = {}
-        db_vnfrs = {}     # vnf's info indexed by _id
-        nb_ro_tasks = 0  # for logging
-        vdu2cloud_init = indata.get("cloud_init_content") or {}
-        step = ''
+        db_vnfrs = {}  # vnf's info indexed by _id
+        step = ""
         logging_text = "Task deploy nsr_id={} action_id={} ".format(nsr_id, action_id)
         self.logger.debug(logging_text + "Enter")
+
         try:
             step = "Getting ns and vnfr record from db"
             db_nsr = self.db.get_one("nsrs", {"_id": nsr_id})
+            self.logger.debug("ns.deploy: db_nsr={}".format(db_nsr))
             db_new_tasks = []
             tasks_by_target_record_id = {}
             # read from db: vnf's of this ns
             step = "Getting vnfrs from db"
             db_vnfrs_list = self.db.get_list("vnfrs", {"nsr-id-ref": nsr_id})
+
             if not db_vnfrs_list:
                 raise NsException("Cannot obtain associated VNF for ns")
+
             for vnfr in db_vnfrs_list:
                 db_vnfrs[vnfr["_id"]] = vnfr
                 db_vnfrs_update[vnfr["_id"]] = {}
+            self.logger.debug("ns.deploy db_vnfrs={}".format(db_vnfrs))
+
             now = time()
             db_ro_nsr = self.db.get_one("ro_nsrs", {"_id": nsr_id}, fail_on_empty=False)
+
             if not db_ro_nsr:
                 db_ro_nsr = self._create_db_ro_nsrs(nsr_id, now)
-            ro_nsr_public_key = db_ro_nsr["public_key"]
 
             # check that action_id is not in the list of actions. Suffixed with :index
             if action_id in db_ro_nsr["actions"]:
                 index = 1
+
                 while True:
                     new_action_id = "{}:{}".format(action_id, index)
+
                     if new_action_id not in db_ro_nsr["actions"]:
                         action_id = new_action_id
-                        self.logger.debug(logging_text + "Changing action_id in use to {}".format(action_id))
+                        self.logger.debug(
+                            logging_text
+                            + "Changing action_id in use to {}".format(action_id)
+                        )
                         break
-                    index += 1
-
-            def _create_task(target_id, item, action, target_record, target_record_id, extra_dict=None):
-                nonlocal task_index
-                nonlocal action_id
-                nonlocal nsr_id
-
-                task = {
-                    "target_id": target_id,  # it will be removed before pushing at database
-                    "action_id": action_id,
-                    "nsr_id": nsr_id,
-                    "task_id": "{}:{}".format(action_id, task_index),
-                    "status": "SCHEDULED",
-                    "action": action,
-                    "item": item,
-                    "target_record": target_record,
-                    "target_record_id": target_record_id,
-                }
-                if extra_dict:
-                    task.update(extra_dict)   # params, find_params, depends_on
-                task_index += 1
-                return task
-
-            def _create_ro_task(target_id, task):
-                nonlocal action_id
-                nonlocal task_index
-                nonlocal now
-
-                _id = task["task_id"]
-                db_ro_task = {
-                    "_id": _id,
-                    "locked_by": None,
-                    "locked_at": 0.0,
-                    "target_id": target_id,
-                    "vim_info": {
-                        "created": False,
-                        "created_items": None,
-                        "vim_id": None,
-                        "vim_name": None,
-                        "vim_status": None,
-                        "vim_details": None,
-                        "refresh_at": None,
-                    },
-                    "modified_at": now,
-                    "created_at": now,
-                    "to_check_at": now,
-                    "tasks": [task],
-                }
-                return db_ro_task
-
-            def _process_image_params(target_image, vim_info, target_record_id):
-                find_params = {}
-                if target_image.get("image"):
-                    find_params["filter_dict"] = {"name": target_image.get("image")}
-                if target_image.get("vim_image_id"):
-                    find_params["filter_dict"] = {"id": target_image.get("vim_image_id")}
-                if target_image.get("image_checksum"):
-                    find_params["filter_dict"] = {"checksum": target_image.get("image_checksum")}
-                return {"find_params": find_params}
-
-            def _process_flavor_params(target_flavor, vim_info, target_record_id):
-
-                def _get_resource_allocation_params(quota_descriptor):
-                    """
-                    read the quota_descriptor from vnfd and fetch the resource allocation properties from the
-                     descriptor object
-                    :param quota_descriptor: cpu/mem/vif/disk-io quota descriptor
-                    :return: quota params for limit, reserve, shares from the descriptor object
-                    """
-                    quota = {}
-                    if quota_descriptor.get("limit"):
-                        quota["limit"] = int(quota_descriptor["limit"])
-                    if quota_descriptor.get("reserve"):
-                        quota["reserve"] = int(quota_descriptor["reserve"])
-                    if quota_descriptor.get("shares"):
-                        quota["shares"] = int(quota_descriptor["shares"])
-                    return quota
-
-                flavor_data = {
-                    "disk": int(target_flavor["storage-gb"]),
-                    "ram": int(target_flavor["memory-mb"]),
-                    "vcpus": int(target_flavor["vcpu-count"]),
-                }
-                numa = {}
-                extended = {}
-                if target_flavor.get("guest-epa"):
-                    extended = {}
-                    epa_vcpu_set = False
-                    if target_flavor["guest-epa"].get("numa-node-policy"):
-                        numa_node_policy = target_flavor["guest-epa"].get("numa-node-policy")
-                        if numa_node_policy.get("node"):
-                            numa_node = numa_node_policy["node"][0]
-                            if numa_node.get("num-cores"):
-                                numa["cores"] = numa_node["num-cores"]
-                                epa_vcpu_set = True
-                            if numa_node.get("paired-threads"):
-                                if numa_node["paired-threads"].get("num-paired-threads"):
-                                    numa["paired-threads"] = int(numa_node["paired-threads"]["num-paired-threads"])
-                                    epa_vcpu_set = True
-                                if len(numa_node["paired-threads"].get("paired-thread-ids")):
-                                    numa["paired-threads-id"] = []
-                                    for pair in numa_node["paired-threads"]["paired-thread-ids"]:
-                                        numa["paired-threads-id"].append(
-                                            (str(pair["thread-a"]), str(pair["thread-b"]))
-                                        )
-                            if numa_node.get("num-threads"):
-                                numa["threads"] = int(numa_node["num-threads"])
-                                epa_vcpu_set = True
-                            if numa_node.get("memory-mb"):
-                                numa["memory"] = max(int(numa_node["memory-mb"] / 1024), 1)
-                    if target_flavor["guest-epa"].get("mempage-size"):
-                        extended["mempage-size"] = target_flavor["guest-epa"].get("mempage-size")
-                    if target_flavor["guest-epa"].get("cpu-pinning-policy") and not epa_vcpu_set:
-                        if target_flavor["guest-epa"]["cpu-pinning-policy"] == "DEDICATED":
-                            if target_flavor["guest-epa"].get("cpu-thread-pinning-policy") and \
-                                    target_flavor["guest-epa"]["cpu-thread-pinning-policy"] != "PREFER":
-                                numa["cores"] = max(flavor_data["vcpus"], 1)
-                            else:
-                                numa["threads"] = max(flavor_data["vcpus"], 1)
-                            epa_vcpu_set = True
-                    if target_flavor["guest-epa"].get("cpu-quota") and not epa_vcpu_set:
-                        cpuquota = _get_resource_allocation_params(target_flavor["guest-epa"].get("cpu-quota"))
-                        if cpuquota:
-                            extended["cpu-quota"] = cpuquota
-                    if target_flavor["guest-epa"].get("mem-quota"):
-                        vduquota = _get_resource_allocation_params(target_flavor["guest-epa"].get("mem-quota"))
-                        if vduquota:
-                            extended["mem-quota"] = vduquota
-                    if target_flavor["guest-epa"].get("disk-io-quota"):
-                        diskioquota = _get_resource_allocation_params(target_flavor["guest-epa"].get("disk-io-quota"))
-                        if diskioquota:
-                            extended["disk-io-quota"] = diskioquota
-                    if target_flavor["guest-epa"].get("vif-quota"):
-                        vifquota = _get_resource_allocation_params(target_flavor["guest-epa"].get("vif-quota"))
-                        if vifquota:
-                            extended["vif-quota"] = vifquota
-                if numa:
-                    extended["numas"] = [numa]
-                if extended:
-                    flavor_data["extended"] = extended
-
-                extra_dict = {"find_params": {"flavor_data": flavor_data}}
-                flavor_data_name = flavor_data.copy()
-                flavor_data_name["name"] = target_flavor["name"]
-                extra_dict["params"] = {"flavor_data": flavor_data_name}
-                return extra_dict
-
-            def _ip_profile_2_ro(ip_profile):
-                if not ip_profile:
-                    return None
-                ro_ip_profile = {
-                    "ip_version": "IPv4" if "v4" in ip_profile.get("ip-version", "ipv4") else "IPv6",
-                    "subnet_address": ip_profile.get("subnet-address"),
-                    "gateway_address": ip_profile.get("gateway-address"),
-                    "dhcp_enabled": ip_profile["dhcp-params"].get("enabled", True)
-                    if "dhcp_params" in ip_profile else False,
-                    "dhcp_start_address": ip_profile["dhcp-params"].get("start-address")
-                    if "dhcp_params" in ip_profile else None,
-                    "dhcp_count": ip_profile["dhcp-params"].get("count") if "dhcp_params" in ip_profile else None,
-                }
-                if ip_profile.get("dns-server"):
-                    ro_ip_profile["dns_address"] = ";".join([v["address"] for v in ip_profile["dns-server"]])
-                if ip_profile.get('security-group'):
-                    ro_ip_profile["security_group"] = ip_profile['security-group']
-                return ro_ip_profile
-
-            def _process_net_params(target_vld, vim_info, target_record_id):
-                nonlocal indata
-                extra_dict = {}
-
-                if vim_info.get("sdn"):
-                    # vnf_preffix = "vnfrs:{}".format(vnfr_id)
-                    # ns_preffix = "nsrs:{}".format(nsr_id)
-                    vld_target_record_id, _, _ = target_record_id.rpartition(".")  # remove the ending ".sdn
-                    extra_dict["params"] = {k: vim_info[k] for k in ("sdn-ports", "target_vim", "vlds", "type")
-                                            if vim_info.get(k)}
-                    # TODO needed to add target_id in the dependency.
-                    if vim_info.get("target_vim"):
-                        extra_dict["depends_on"] = [vim_info.get("target_vim") + " " + vld_target_record_id]
-                    return extra_dict
-
-                if vim_info.get("vim_network_name"):
-                    extra_dict["find_params"] = {"filter_dict": {"name": vim_info.get("vim_network_name")}}
-                elif vim_info.get("vim_network_id"):
-                    extra_dict["find_params"] = {"filter_dict": {"id": vim_info.get("vim_network_id")}}
-                elif target_vld.get("mgmt-network"):
-                    extra_dict["find_params"] = {"mgmt": True, "name": target_vld["id"]}
-                else:
-                    # create
-                    extra_dict["params"] = {
-                        "net_name": "{}-{}".format(indata["name"][:16], target_vld.get("name", target_vld["id"])[:16]),
-                        "ip_profile": _ip_profile_2_ro(vim_info.get('ip_profile')),
-                        "provider_network_profile": vim_info.get('provider_network'),
-                    }
-                    if not target_vld.get("underlay"):
-                        extra_dict["params"]["net_type"] = "bridge"
-                    else:
-                        extra_dict["params"]["net_type"] = "ptp" if target_vld.get("type") == "ELINE" else "data"
-                return extra_dict
-
-            def _process_vdu_params(target_vdu, vim_info, target_record_id):
-                nonlocal vnfr_id
-                nonlocal nsr_id
-                nonlocal indata
-                nonlocal vnfr
-                nonlocal vdu2cloud_init
-                nonlocal tasks_by_target_record_id
-                vnf_preffix = "vnfrs:{}".format(vnfr_id)
-                ns_preffix = "nsrs:{}".format(nsr_id)
-                image_text = ns_preffix + ":image." + target_vdu["ns-image-id"]
-                flavor_text = ns_preffix + ":flavor." + target_vdu["ns-flavor-id"]
-                extra_dict = {"depends_on": [image_text, flavor_text]}
-                net_list = []
-                for iface_index, interface in enumerate(target_vdu["interfaces"]):
-                    if interface.get("ns-vld-id"):
-                        net_text = ns_preffix + ":vld." + interface["ns-vld-id"]
-                    elif interface.get("vnf-vld-id"):
-                        net_text = vnf_preffix + ":vld." + interface["vnf-vld-id"]
-                    else:
-                        self.logger.error("Interface {} from vdu {} not connected to any vld".format(
-                            iface_index, target_vdu["vdu-name"]))
-                        continue   # interface not connected to any vld
-                    extra_dict["depends_on"].append(net_text)
-                    net_item = {x: v for x, v in interface.items() if x in
-                                ("name", "vpci", "port_security", "port_security_disable_strategy", "floating_ip")}
-                    net_item["net_id"] = "TASK-" + net_text
-                    net_item["type"] = "virtual"
-                    # TODO mac_address: used for  SR-IOV ifaces #TODO for other types
-                    # TODO floating_ip: True/False (or it can be None)
-                    if interface.get("type") in ("SR-IOV", "PCI-PASSTHROUGH"):
-                        # mark the net create task as type data
-                        if deep_get(tasks_by_target_record_id, net_text, "params", "net_type"):
-                            tasks_by_target_record_id[net_text]["params"]["net_type"] = "data"
-                        net_item["use"] = "data"
-                        net_item["model"] = interface["type"]
-                        net_item["type"] = interface["type"]
-                    elif interface.get("type") == "OM-MGMT" or interface.get("mgmt-interface") or \
-                            interface.get("mgmt-vnf"):
-                        net_item["use"] = "mgmt"
-                    else:   # if interface.get("type") in ("VIRTIO", "E1000", "PARAVIRT"):
-                        net_item["use"] = "bridge"
-                        net_item["model"] = interface.get("type")
-                    if interface.get("ip-address"):
-                        net_item["ip_address"] = interface["ip-address"]
-                    if interface.get("mac-address"):
-                        net_item["mac_address"] = interface["mac-address"]
-                    net_list.append(net_item)
-                    if interface.get("mgmt-vnf"):
-                        extra_dict["mgmt_vnf_interface"] = iface_index
-                    elif interface.get("mgmt-interface"):
-                        extra_dict["mgmt_vdu_interface"] = iface_index
-                # cloud config
-                cloud_config = {}
-                if target_vdu.get("cloud-init"):
-                    if target_vdu["cloud-init"] not in vdu2cloud_init:
-                        vdu2cloud_init[target_vdu["cloud-init"]] = self._get_cloud_init(target_vdu["cloud-init"])
-                    cloud_content_ = vdu2cloud_init[target_vdu["cloud-init"]]
-                    cloud_config["user-data"] = self._parse_jinja2(cloud_content_, target_vdu.get("additionalParams"),
-                                                                   target_vdu["cloud-init"])
-                if target_vdu.get("boot-data-drive"):
-                    cloud_config["boot-data-drive"] = target_vdu.get("boot-data-drive")
-                ssh_keys = []
-                if target_vdu.get("ssh-keys"):
-                    ssh_keys += target_vdu.get("ssh-keys")
-                if target_vdu.get("ssh-access-required"):
-                    ssh_keys.append(ro_nsr_public_key)
-                if ssh_keys:
-                    cloud_config["key-pairs"] = ssh_keys
 
-                extra_dict["params"] = {
-                    "name": "{}-{}-{}-{}".format(indata["name"][:16], vnfr["member-vnf-index-ref"][:16],
-                                                 target_vdu["vdu-name"][:32], target_vdu.get("count-index") or 0),
-                    "description": target_vdu["vdu-name"],
-                    "start": True,
-                    "image_id": "TASK-" + image_text,
-                    "flavor_id": "TASK-" + flavor_text,
-                    "net_list": net_list,
-                    "cloud_config": cloud_config or None,
-                    "disk_list": None,  # TODO
-                    "availability_zone_index": None,  # TODO
-                    "availability_zone_list": None,  # TODO
-                }
-                return extra_dict
-
-            def _process_items(target_list, existing_list, db_record, db_update, db_path, item, process_params):
-                nonlocal db_new_tasks
-                nonlocal tasks_by_target_record_id
-                nonlocal task_index
-
-                # ensure all the target_list elements has an "id". If not assign the index as id
-                for target_index, tl in enumerate(target_list):
-                    if tl and not tl.get("id"):
-                        tl["id"] = str(target_index)
-
-                # step 1 items (networks,vdus,...) to be deleted/updated
-                for item_index, existing_item in enumerate(existing_list):
-                    target_item = next((t for t in target_list if t["id"] == existing_item["id"]), None)
-                    for target_vim, existing_viminfo in existing_item.get("vim_info", {}).items():
-                        if existing_viminfo is None:
-                            continue
-                        if target_item:
-                            target_viminfo = target_item.get("vim_info", {}).get(target_vim)
-                        else:
-                            target_viminfo = None
-                        if target_viminfo is None:
-                            # must be deleted
-                            self._assign_vim(target_vim)
-                            target_record_id = "{}.{}".format(db_record, existing_item["id"])
-                            item_ = item
-                            if target_vim.startswith("sdn"):
-                                # item must be sdn-net instead of net if target_vim is a sdn
-                                item_ = "sdn_net"
-                                target_record_id += ".sdn"
-                            task = _create_task(
-                                target_vim, item_, "DELETE",
-                                target_record="{}.{}.vim_info.{}".format(db_record, item_index, target_vim),
-                                target_record_id=target_record_id)
-                            tasks_by_target_record_id[target_record_id] = task
-                            db_new_tasks.append(task)
-                            # TODO delete
-                    # TODO check one by one the vims to be created/deleted
-
-                # step 2 items (networks,vdus,...) to be created
-                for target_item in target_list:
-                    item_index = -1
-                    for item_index, existing_item in enumerate(existing_list):
-                        if existing_item["id"] == target_item["id"]:
-                            break
-                    else:
-                        item_index += 1
-                        db_update[db_path + ".{}".format(item_index)] = target_item
-                        existing_list.append(target_item)
-                        existing_item = None
-
-                    for target_vim, target_viminfo in target_item.get("vim_info", {}).items():
-                        existing_viminfo = None
-                        if existing_item:
-                            existing_viminfo = existing_item.get("vim_info", {}).get(target_vim)
-                        # TODO check if different. Delete and create???
-                        # TODO delete if not exist
-                        if existing_viminfo is not None:
-                            continue
-
-                        target_record_id = "{}.{}".format(db_record, target_item["id"])
-                        item_ = item
-                        if target_vim.startswith("sdn"):
-                            # item must be sdn-net instead of net if target_vim is a sdn
-                            item_ = "sdn_net"
-                            target_record_id += ".sdn"
-                        extra_dict = process_params(target_item, target_viminfo, target_record_id)
-
-                        self._assign_vim(target_vim)
-                        task = _create_task(
-                            target_vim, item_, "CREATE",
-                            target_record="{}.{}.vim_info.{}".format(db_record, item_index, target_vim),
-                            target_record_id=target_record_id,
-                            extra_dict=extra_dict)
-                        tasks_by_target_record_id[target_record_id] = task
-                        db_new_tasks.append(task)
-                        if target_item.get("common_id"):
-                            task["common_id"] = target_item["common_id"]
-
-                        db_update[db_path + ".{}".format(item_index)] = target_item
+                    index += 1
 
             def _process_action(indata):
                 nonlocal db_new_tasks
+                nonlocal action_id
+                nonlocal nsr_id
                 nonlocal task_index
                 nonlocal db_vnfrs
                 nonlocal db_ro_nsr
@@ -730,20 +2178,41 @@ class Ns(object):
                     key = indata["action"].get("key")
                     user = indata["action"].get("user")
                     password = indata["action"].get("password")
+
                     for vnf in indata.get("vnf", ()):
                         if vnf["_id"] not in db_vnfrs:
                             raise NsException("Invalid vnf={}".format(vnf["_id"]))
+
                         db_vnfr = db_vnfrs[vnf["_id"]]
+
                         for target_vdu in vnf.get("vdur", ()):
-                            vdu_index, vdur = next((i_v for i_v in enumerate(db_vnfr["vdur"]) if
-                                                    i_v[1]["id"] == target_vdu["id"]), (None, None))
+                            vdu_index, vdur = next(
+                                (
+                                    i_v
+                                    for i_v in enumerate(db_vnfr["vdur"])
+                                    if i_v[1]["id"] == target_vdu["id"]
+                                ),
+                                (None, None),
+                            )
+
                             if not vdur:
-                                raise NsException("Invalid vdu vnf={}.{}".format(vnf["_id"], target_vdu["id"]))
-                            target_vim, vim_info = next(k_v for k_v in vdur["vim_info"].items())
+                                raise NsException(
+                                    "Invalid vdu vnf={}.{}".format(
+                                        vnf["_id"], target_vdu["id"]
+                                    )
+                                )
+
+                            target_vim, vim_info = next(
+                                k_v for k_v in vdur["vim_info"].items()
+                            )
                             self._assign_vim(target_vim)
-                            target_record = "vnfrs:{}:vdur.{}.ssh_keys".format(vnf["_id"], vdu_index)
+                            target_record = "vnfrs:{}:vdur.{}.ssh_keys".format(
+                                vnf["_id"], vdu_index
+                            )
                             extra_dict = {
-                                "depends_on": ["vnfrs:{}:vdur.{}".format(vnf["_id"], vdur["id"])],
+                                "depends_on": [
+                                    "vnfrs:{}:vdur.{}".format(vnf["_id"], vdur["id"])
+                                ],
                                 "params": {
                                     "ip_address": vdur.get("ip-address"),
                                     "user": user,
@@ -751,13 +2220,30 @@ class Ns(object):
                                     "password": password,
                                     "private_key": db_ro_nsr["private_key"],
                                     "salt": db_ro_nsr["_id"],
-                                    "schema_version": db_ro_nsr["_admin"]["schema_version"]
-                                }
+                                    "schema_version": db_ro_nsr["_admin"][
+                                        "schema_version"
+                                    ],
+                                },
                             }
-                            task = _create_task(target_vim, "vdu", "EXEC",
-                                                target_record=target_record,
-                                                target_record_id=None,
-                                                extra_dict=extra_dict)
+
+                            deployment_info = {
+                                "action_id": action_id,
+                                "nsr_id": nsr_id,
+                                "task_index": task_index,
+                            }
+
+                            task = Ns._create_task(
+                                deployment_info=deployment_info,
+                                target_id=target_vim,
+                                item="vdu",
+                                action="EXEC",
+                                target_record=target_record,
+                                target_record_id=None,
+                                extra_dict=extra_dict,
+                            )
+
+                            task_index = deployment_info.get("task_index")
+
                             db_new_tasks.append(task)
 
             with self.write_lock:
@@ -765,142 +2251,358 @@ class Ns(object):
                     _process_action(indata)
                 else:
                     # compute network differences
-                    # NS.vld
-                    step = "process NS VLDs"
-                    _process_items(target_list=indata["ns"]["vld"] or [], existing_list=db_nsr.get("vld") or [],
-                                   db_record="nsrs:{}:vld".format(nsr_id), db_update=db_nsr_update,
-                                   db_path="vld", item="net", process_params=_process_net_params)
-
-                    step = "process NS images"
-                    _process_items(target_list=indata.get("image") or [], existing_list=db_nsr.get("image") or [],
-                                   db_record="nsrs:{}:image".format(nsr_id),
-                                   db_update=db_nsr_update, db_path="image", item="image",
-                                   process_params=_process_image_params)
-
-                    step = "process NS flavors"
-                    _process_items(target_list=indata.get("flavor") or [], existing_list=db_nsr.get("flavor") or [],
-                                   db_record="nsrs:{}:flavor".format(nsr_id),
-                                   db_update=db_nsr_update, db_path="flavor", item="flavor",
-                                   process_params=_process_flavor_params)
-
-                    # VNF.vld
-                    for vnfr_id, vnfr in db_vnfrs.items():
-                        # vnfr_id need to be set as global variable for among others nested method _process_vdu_params
-                        step = "process VNF={} VLDs".format(vnfr_id)
-                        target_vnf = next((vnf for vnf in indata.get("vnf", ()) if vnf["_id"] == vnfr_id), None)
-                        target_list = target_vnf.get("vld") if target_vnf else None
-                        _process_items(target_list=target_list or [], existing_list=vnfr.get("vld") or [],
-                                       db_record="vnfrs:{}:vld".format(vnfr_id), db_update=db_vnfrs_update[vnfr["_id"]],
-                                       db_path="vld", item="net", process_params=_process_net_params)
-
-                        target_list = target_vnf.get("vdur") if target_vnf else None
-                        step = "process VNF={} VDUs".format(vnfr_id)
-                        _process_items(target_list=target_list or [], existing_list=vnfr.get("vdur") or [],
-                                       db_record="vnfrs:{}:vdur".format(vnfr_id),
-                                       db_update=db_vnfrs_update[vnfr["_id"]], db_path="vdur", item="vdu",
-                                       process_params=_process_vdu_params)
-
-                for db_task in db_new_tasks:
-                    step = "Updating database, Appending tasks to ro_tasks"
-                    target_id = db_task.pop("target_id")
-                    common_id = db_task.get("common_id")
-                    if common_id:
-                        if self.db.set_one("ro_tasks",
-                                           q_filter={"target_id": target_id,
-                                                     "tasks.common_id": common_id},
-                                           update_dict={"to_check_at": now, "modified_at": now},
-                                           push={"tasks": db_task}, fail_on_empty=False):
-                            continue
-                    if not self.db.set_one("ro_tasks",
-                                           q_filter={"target_id": target_id,
-                                                     "tasks.target_record": db_task["target_record"]},
-                                           update_dict={"to_check_at": now, "modified_at": now},
-                                           push={"tasks": db_task}, fail_on_empty=False):
-                        # Create a ro_task
-                        step = "Updating database, Creating ro_tasks"
-                        db_ro_task = _create_ro_task(target_id, db_task)
-                        nb_ro_tasks += 1
-                        self.db.create("ro_tasks", db_ro_task)
+                    # NS
+                    step = "process NS elements"
+                    changes_list = self.calculate_all_differences_to_deploy(
+                        indata=indata,
+                        nsr_id=nsr_id,
+                        db_nsr=db_nsr,
+                        db_vnfrs=db_vnfrs,
+                        db_ro_nsr=db_ro_nsr,
+                        db_nsr_update=db_nsr_update,
+                        db_vnfrs_update=db_vnfrs_update,
+                        action_id=action_id,
+                        tasks_by_target_record_id=tasks_by_target_record_id,
+                    )
+                    self.define_all_tasks(
+                        changes_list=changes_list,
+                        db_new_tasks=db_new_tasks,
+                        tasks_by_target_record_id=tasks_by_target_record_id,
+                    )
+
+                step = "Updating database, Appending tasks to ro_tasks"
+                self.upload_all_tasks(
+                    db_new_tasks=db_new_tasks,
+                    now=now,
+                )
+
                 step = "Updating database, nsrs"
                 if db_nsr_update:
                     self.db.set_one("nsrs", {"_id": nsr_id}, db_nsr_update)
+
                 for vnfr_id, db_vnfr_update in db_vnfrs_update.items():
                     if db_vnfr_update:
                         step = "Updating database, vnfrs={}".format(vnfr_id)
                         self.db.set_one("vnfrs", {"_id": vnfr_id}, db_vnfr_update)
 
-            self.logger.debug(logging_text + "Exit. Created {} ro_tasks; {} tasks".format(nb_ro_tasks,
-                                                                                          len(db_new_tasks)))
-            return {"status": "ok", "nsr_id": nsr_id, "action_id": action_id}, action_id, True
+            self.logger.debug(
+                logging_text + "Exit. Created {} tasks".format(len(db_new_tasks))
+            )
 
+            return (
+                {"status": "ok", "nsr_id": nsr_id, "action_id": action_id},
+                action_id,
+                True,
+            )
         except Exception as e:
             if isinstance(e, (DbException, NsException)):
-                self.logger.error(logging_text + "Exit Exception while '{}': {}".format(step, e))
+                self.logger.error(
+                    logging_text + "Exit Exception while '{}': {}".format(step, e)
+                )
             else:
                 e = traceback_format_exc()
-                self.logger.critical(logging_text + "Exit Exception while '{}': {}".format(step, e), exc_info=True)
+                self.logger.critical(
+                    logging_text + "Exit Exception while '{}': {}".format(step, e),
+                    exc_info=True,
+                )
+
             raise NsException(e)
 
     def delete(self, session, indata, version, nsr_id, *args, **kwargs):
         self.logger.debug("ns.delete version={} nsr_id={}".format(version, nsr_id))
         # self.db.del_list({"_id": ro_task["_id"], "tasks.nsr_id.ne": nsr_id})
+
         with self.write_lock:
             try:
                 NsWorker.delete_db_tasks(self.db, nsr_id, None)
             except NsWorkerException as e:
                 raise NsException(e)
+
         return None, None, True
 
     def status(self, session, indata, version, nsr_id, action_id, *args, **kwargs):
-        # self.logger.debug("ns.status version={} nsr_id={}, action_id={} indata={}"
-        #                   .format(version, nsr_id, action_id, indata))
+        self.logger.debug(
+            "ns.status version={} nsr_id={}, action_id={} indata={}".format(
+                version, nsr_id, action_id, indata
+            )
+        )
         task_list = []
         done = 0
         total = 0
         ro_tasks = self.db.get_list("ro_tasks", {"tasks.action_id": action_id})
         global_status = "DONE"
         details = []
+
         for ro_task in ro_tasks:
             for task in ro_task["tasks"]:
                 if task and task["action_id"] == action_id:
                     task_list.append(task)
                     total += 1
+
                     if task["status"] == "FAILED":
                         global_status = "FAILED"
-                        error_text = "Error at {} {}: {}".format(task["action"].lower(), task["item"],
-                                                                 ro_task["vim_info"].get("vim_details") or "unknown")
+                        error_text = "Error at {} {}: {}".format(
+                            task["action"].lower(),
+                            task["item"],
+                            ro_task["vim_info"].get("vim_message") or "unknown",
+                        )
                         details.append(error_text)
                     elif task["status"] in ("SCHEDULED", "BUILD"):
                         if global_status != "FAILED":
                             global_status = "BUILD"
                     else:
                         done += 1
+
         return_data = {
             "status": global_status,
-            "details": ". ".join(details) if details else "progress {}/{}".format(done, total),
+            "details": ". ".join(details)
+            if details
+            else "progress {}/{}".format(done, total),
             "nsr_id": nsr_id,
             "action_id": action_id,
-            "tasks": task_list
+            "tasks": task_list,
         }
+
         return return_data, None, True
 
+    def recreate_status(
+        self, session, indata, version, nsr_id, action_id, *args, **kwargs
+    ):
+        return self.status(session, indata, version, nsr_id, action_id, *args, **kwargs)
+
     def cancel(self, session, indata, version, nsr_id, action_id, *args, **kwargs):
-        print("ns.cancel session={} indata={} version={} nsr_id={}, action_id={}".format(session, indata, version,
-                                                                                         nsr_id, action_id))
+        print(
+            "ns.cancel session={} indata={} version={} nsr_id={}, action_id={}".format(
+                session, indata, version, nsr_id, action_id
+            )
+        )
+
         return None, None, True
 
+    def rebuild_start_stop_task(
+        self,
+        vdu_id,
+        vnf_id,
+        vdu_index,
+        action_id,
+        nsr_id,
+        task_index,
+        target_vim,
+        extra_dict,
+    ):
+        self._assign_vim(target_vim)
+        target_record = "vnfrs:{}:vdur.{}".format(vnf_id, vdu_index)
+        target_record_id = "vnfrs:{}:vdur.{}".format(vnf_id, vdu_id)
+        deployment_info = {
+            "action_id": action_id,
+            "nsr_id": nsr_id,
+            "task_index": task_index,
+        }
+
+        task = Ns._create_task(
+            deployment_info=deployment_info,
+            target_id=target_vim,
+            item="update",
+            action="EXEC",
+            target_record=target_record,
+            target_record_id=target_record_id,
+            extra_dict=extra_dict,
+        )
+        return task
+
+    def rebuild_start_stop(
+        self, session, action_dict, version, nsr_id, *args, **kwargs
+    ):
+        task_index = 0
+        extra_dict = {}
+        now = time()
+        action_id = action_dict.get("action_id", str(uuid4()))
+        step = ""
+        logging_text = "Task deploy nsr_id={} action_id={} ".format(nsr_id, action_id)
+        self.logger.debug(logging_text + "Enter")
+
+        action = list(action_dict.keys())[0]
+        task_dict = action_dict.get(action)
+        vim_vm_id = action_dict.get(action).get("vim_vm_id")
+
+        if action_dict.get("stop"):
+            action = "shutoff"
+        db_new_tasks = []
+        try:
+            step = "lock the operation & do task creation"
+            with self.write_lock:
+                extra_dict["params"] = {
+                    "vim_vm_id": vim_vm_id,
+                    "action": action,
+                }
+                task = self.rebuild_start_stop_task(
+                    task_dict["vdu_id"],
+                    task_dict["vnf_id"],
+                    task_dict["vdu_index"],
+                    action_id,
+                    nsr_id,
+                    task_index,
+                    task_dict["target_vim"],
+                    extra_dict,
+                )
+                db_new_tasks.append(task)
+                step = "upload Task to db"
+                self.upload_all_tasks(
+                    db_new_tasks=db_new_tasks,
+                    now=now,
+                )
+                self.logger.debug(
+                    logging_text + "Exit. Created {} tasks".format(len(db_new_tasks))
+                )
+                return (
+                    {"status": "ok", "nsr_id": nsr_id, "action_id": action_id},
+                    action_id,
+                    True,
+                )
+        except Exception as e:
+            if isinstance(e, (DbException, NsException)):
+                self.logger.error(
+                    logging_text + "Exit Exception while '{}': {}".format(step, e)
+                )
+            else:
+                e = traceback_format_exc()
+                self.logger.critical(
+                    logging_text + "Exit Exception while '{}': {}".format(step, e),
+                    exc_info=True,
+                )
+            raise NsException(e)
+
     def get_deploy(self, session, indata, version, nsr_id, action_id, *args, **kwargs):
         nsrs = self.db.get_list("nsrs", {})
         return_data = []
+
         for ns in nsrs:
             return_data.append({"_id": ns["_id"], "name": ns["name"]})
+
         return return_data, None, True
 
     def get_actions(self, session, indata, version, nsr_id, action_id, *args, **kwargs):
         ro_tasks = self.db.get_list("ro_tasks", {"tasks.nsr_id": nsr_id})
         return_data = []
+
         for ro_task in ro_tasks:
             for task in ro_task["tasks"]:
                 if task["action_id"] not in return_data:
                     return_data.append(task["action_id"])
+
         return return_data, None, True
+
+    def migrate_task(
+        self, vdu, vnf, vdu_index, action_id, nsr_id, task_index, extra_dict
+    ):
+        target_vim, vim_info = next(k_v for k_v in vdu["vim_info"].items())
+        self._assign_vim(target_vim)
+        target_record = "vnfrs:{}:vdur.{}".format(vnf["_id"], vdu_index)
+        target_record_id = "vnfrs:{}:vdur.{}".format(vnf["_id"], vdu["id"])
+        deployment_info = {
+            "action_id": action_id,
+            "nsr_id": nsr_id,
+            "task_index": task_index,
+        }
+
+        task = Ns._create_task(
+            deployment_info=deployment_info,
+            target_id=target_vim,
+            item="migrate",
+            action="EXEC",
+            target_record=target_record,
+            target_record_id=target_record_id,
+            extra_dict=extra_dict,
+        )
+
+        return task
+
+    def migrate(self, session, indata, version, nsr_id, *args, **kwargs):
+        task_index = 0
+        extra_dict = {}
+        now = time()
+        action_id = indata.get("action_id", str(uuid4()))
+        step = ""
+        logging_text = "Task deploy nsr_id={} action_id={} ".format(nsr_id, action_id)
+        self.logger.debug(logging_text + "Enter")
+        try:
+            vnf_instance_id = indata["vnfInstanceId"]
+            step = "Getting vnfrs from db"
+            db_vnfr = self.db.get_one("vnfrs", {"_id": vnf_instance_id})
+            vdu = indata.get("vdu")
+            migrateToHost = indata.get("migrateToHost")
+            db_new_tasks = []
+
+            with self.write_lock:
+                if vdu is not None:
+                    vdu_id = indata["vdu"]["vduId"]
+                    vdu_count_index = indata["vdu"].get("vduCountIndex", 0)
+                    for vdu_index, vdu in enumerate(db_vnfr["vdur"]):
+                        if (
+                            vdu["vdu-id-ref"] == vdu_id
+                            and vdu["count-index"] == vdu_count_index
+                        ):
+                            extra_dict["params"] = {
+                                "vim_vm_id": vdu["vim-id"],
+                                "migrate_host": migrateToHost,
+                                "vdu_vim_info": vdu["vim_info"],
+                            }
+                            step = "Creating migration task for vdu:{}".format(vdu)
+                            task = self.migrate_task(
+                                vdu,
+                                db_vnfr,
+                                vdu_index,
+                                action_id,
+                                nsr_id,
+                                task_index,
+                                extra_dict,
+                            )
+                            db_new_tasks.append(task)
+                            task_index += 1
+                            break
+                else:
+
+                    for vdu_index, vdu in enumerate(db_vnfr["vdur"]):
+                        extra_dict["params"] = {
+                            "vim_vm_id": vdu["vim-id"],
+                            "migrate_host": migrateToHost,
+                            "vdu_vim_info": vdu["vim_info"],
+                        }
+                        step = "Creating migration task for vdu:{}".format(vdu)
+                        task = self.migrate_task(
+                            vdu,
+                            db_vnfr,
+                            vdu_index,
+                            action_id,
+                            nsr_id,
+                            task_index,
+                            extra_dict,
+                        )
+                        db_new_tasks.append(task)
+                        task_index += 1
+
+                self.upload_all_tasks(
+                    db_new_tasks=db_new_tasks,
+                    now=now,
+                )
+
+            self.logger.debug(
+                logging_text + "Exit. Created {} tasks".format(len(db_new_tasks))
+            )
+            return (
+                {"status": "ok", "nsr_id": nsr_id, "action_id": action_id},
+                action_id,
+                True,
+            )
+        except Exception as e:
+            if isinstance(e, (DbException, NsException)):
+                self.logger.error(
+                    logging_text + "Exit Exception while '{}': {}".format(step, e)
+                )
+            else:
+                e = traceback_format_exc()
+                self.logger.critical(
+                    logging_text + "Exit Exception while '{}': {}".format(step, e),
+                    exc_info=True,
+                )
+            raise NsException(e)