Correcting invalid vcpu calculation and vcpu pinning policy evaluation.
[osm/RO.git] / NG-RO / osm_ng_ro / ns.py
index 8e2f827..70217d6 100644 (file)
 ##
 
 from http import HTTPStatus
+from itertools import product
 import logging
 from random import choice as random_choice
 from threading import Lock
 from time import time
 from traceback import format_exc as traceback_format_exc
-from typing import Any, Dict, Tuple, Type
+from typing import Any, Dict, List, Optional, Tuple, Type
 from uuid import uuid4
 
 from cryptography.hazmat.backends import default_backend as crypto_default_backend
@@ -30,6 +31,7 @@ from cryptography.hazmat.primitives import serialization as crypto_serialization
 from cryptography.hazmat.primitives.asymmetric import rsa
 from jinja2 import (
     Environment,
+    select_autoescape,
     StrictUndefined,
     TemplateError,
     TemplateNotFound,
@@ -49,6 +51,7 @@ 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"
@@ -75,8 +78,8 @@ def get_process_id():
 
             if text_id:
                 return text_id
-    except Exception:
-        pass
+    except Exception as error:
+        logging.exception(f"{error} occured while getting process id")
 
     # Return a random id
     return "".join(random_choice("0123456789abcdef") for _ in range(12))
@@ -113,12 +116,14 @@ class Ns(object):
             "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):
@@ -376,7 +381,10 @@ class Ns(object):
             str: [description]
         """
         try:
-            env = Environment(undefined=StrictUndefined)
+            env = Environment(
+                undefined=StrictUndefined,
+                autoescape=select_autoescape(default_for_string=True, default=True),
+            )
             template = env.from_string(cloud_init_content)
 
             return template.render(params or {})
@@ -505,6 +513,7 @@ class Ns(object):
                 "vim_name": None,
                 "vim_status": None,
                 "vim_details": None,
+                "vim_message": None,
                 "refresh_at": None,
             },
             "modified_at": now,
@@ -638,44 +647,57 @@ class Ns(object):
             Tuple[Dict[str, Any], bool]: [description]
         """
         numa = {}
+        numa_list = []
         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
+                for numa_node in numa_node_policy["node"]:
+                    vcpu_list = []
+                    if numa_node.get("id"):
+                        numa["id"] = int(numa_node["id"])
+
+                    if numa_node.get("vcpu"):
+                        for vcpu in numa_node.get("vcpu"):
+                            vcpu_id = int(vcpu.get("id"))
+                            vcpu_list.append(vcpu_id)
+                        numa["vcpu"] = vcpu_list
+
+                    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"] = []
+                    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"]),
+                        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("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)
 
-                if numa_node.get("memory-mb"):
-                    numa["memory"] = max(int(int(numa_node["memory-mb"]) / 1024), 1)
+                    numa_list.append(numa)
+                    numa = {}
 
-        return numa, epa_vcpu_set
+        return numa_list, epa_vcpu_set
 
     @staticmethod
     def _process_guest_epa_cpu_pinning_params(
@@ -700,9 +722,12 @@ class Ns(object):
             guest_epa_quota.get("cpu-pinning-policy") == "DEDICATED"
             and not epa_vcpu_set
         ):
+            # Pinning policy "REQUIRE" uses threads as host should support SMT architecture
+            # Pinning policy "ISOLATE" uses cores as host should not support SMT architecture
+            # Pinning policy "PREFER" uses threads in case host supports SMT architecture
             numa[
                 "cores"
-                if guest_epa_quota.get("cpu-thread-pinning-policy") != "PREFER"
+                if guest_epa_quota.get("cpu-thread-pinning-policy") == "ISOLATE"
                 else "threads"
             ] = max(vcpu_count, 1)
             local_epa_vcpu_set = True
@@ -723,23 +748,39 @@ class Ns(object):
         """
         extended = {}
         numa = {}
+        numa_list = []
 
         if target_flavor.get("guest-epa"):
             guest_epa = target_flavor["guest-epa"]
 
-            numa, epa_vcpu_set = Ns._process_guest_epa_numa_params(
+            numa_list, 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")
 
+            if guest_epa.get("cpu-pinning-policy"):
+                extended["cpu-pinning-policy"] = guest_epa.get("cpu-pinning-policy")
+
+            if guest_epa.get("cpu-thread-pinning-policy"):
+                extended["cpu-thread-pinning-policy"] = guest_epa.get(
+                    "cpu-thread-pinning-policy"
+                )
+
+            if guest_epa.get("numa-node-policy"):
+                if guest_epa.get("numa-node-policy").get("mem-policy"):
+                    extended["mem-policy"] = guest_epa.get("numa-node-policy").get(
+                        "mem-policy"
+                    )
+
             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)
+            for numa in numa_list:
+                numa.update(tmp_numa)
 
             extended.update(
                 Ns._process_guest_epa_quota_params(
@@ -749,7 +790,7 @@ class Ns(object):
             )
 
         if numa:
-            extended["numas"] = [numa]
+            extended["numas"] = numa_list
 
         return extended
 
@@ -772,18 +813,35 @@ class Ns(object):
         Returns:
             Dict[str, Any]: [description]
         """
+        db = kwargs.get("db")
+        target_vdur = {}
+
         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"]:
+                if vdur.get("ns-flavor-id") == target_flavor.get("id"):
                     target_vdur = vdur
 
+        if db and isinstance(indata.get("vnf"), list):
+            vnfd_id = indata.get("vnf")[0].get("vnfd-id")
+            vnfd = db.get_one("vnfds", {"_id": vnfd_id})
+            # check if there is persistent root disk
+            for vdu in vnfd.get("vdu", ()):
+                if vdu["name"] == target_vdur.get("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"
+                            ):
+                                flavor_data["disk"] = 0
+
         for storage in target_vdur.get("virtual-storages", []):
             if (
                 storage.get("type-of-storage")
@@ -894,7 +952,7 @@ class Ns(object):
                     "id": vim_info.get("vim_network_id"),
                 },
             }
-        elif target_vld.get("mgmt-network"):
+        elif target_vld.get("mgmt-network") and not vim_info.get("provider_network"):
             extra_dict["find_params"] = {
                 "mgmt": True,
                 "name": target_vld["id"],
@@ -919,122 +977,197 @@ class Ns(object):
         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.
+    def find_persistent_root_volumes(
+        vnfd: dict,
+        target_vdu: dict,
+        vdu_instantiation_volumes_list: list,
+        disk_list: list,
+    ) -> Dict[str, any]:
+        """Find the persistent root volumes and add them to the disk_list
+        by parsing the instantiation parameters.
 
         Args:
-            target_vdu (Dict[str, Any]): [description]
-            indata (Dict[str, Any]): [description]
-            vim_info (Dict[str, Any]): [description]
-            target_record_id (str): [description]
+            vnfd    (dict):                                 VNF descriptor
+            target_vdu      (dict):                         processed VDU
+            vdu_instantiation_volumes_list  (list):         instantiation parameters for the each VDU as a list
+            disk_list   (list):                             to be filled up
 
         Returns:
-            Dict[str, Any]: [description]
+            persistent_root_disk    (dict):                 Details of persistent root disk
+
         """
-        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")
+        persistent_root_disk = {}
+        # There can be only one root disk, when we find it, it will return the result
 
-        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 vdu, vsd in product(
+            vnfd.get("vdu", ()), vnfd.get("virtual-storage-desc", ())
+        ):
+            if (
+                vdu["name"] == target_vdu["vdu-name"]
+                and vsd.get("id") == vdu.get("virtual-storage-desc", [[]])[0]
+            ):
+                root_disk = vsd
+                if (
+                    root_disk.get("type-of-storage")
+                    == "persistent-storage:persistent-storage"
+                ):
+                    for vdu_volume in vdu_instantiation_volumes_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:
-                logger.error(
-                    "Interface {} from vdu {} not connected to any vld".format(
-                        iface_index, target_vdu["vdu-name"]
-                    )
-                )
+                        if (
+                            vdu_volume["vim-volume-id"]
+                            and root_disk["id"] == vdu_volume["name"]
+                        ):
 
-                continue  # interface not connected to any vld
+                            persistent_root_disk[vsd["id"]] = {
+                                "vim_volume_id": vdu_volume["vim-volume-id"],
+                                "image_id": vdu.get("sw-image-desc"),
+                            }
 
-            extra_dict["depends_on"].append(net_text)
+                            disk_list.append(persistent_root_disk[vsd["id"]])
 
-            if "port-security-enabled" in interface:
-                interface["port_security"] = interface.pop("port-security-enabled")
+                            return persistent_root_disk
 
-            if "port-security-disable-strategy" in interface:
-                interface["port_security_disable_strategy"] = interface.pop(
-                    "port-security-disable-strategy"
-                )
+                    else:
 
-            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"
+                        if root_disk.get("size-of-storage"):
+                            persistent_root_disk[vsd["id"]] = {
+                                "image_id": vdu.get("sw-image-desc"),
+                                "size": root_disk.get("size-of-storage"),
+                                "keep": Ns.is_volume_keeping_required(root_disk),
+                            }
 
-            # 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"
+                            disk_list.append(persistent_root_disk[vsd["id"]])
 
-                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")
+                            return persistent_root_disk
+
+    @staticmethod
+    def find_persistent_volumes(
+        persistent_root_disk: dict,
+        target_vdu: dict,
+        vdu_instantiation_volumes_list: list,
+        disk_list: list,
+    ) -> None:
+        """Find the ordinary persistent volumes and add them to the disk_list
+        by parsing the instantiation parameters.
+
+        Args:
+            persistent_root_disk:   persistent root disk dictionary
+            target_vdu: processed VDU
+            vdu_instantiation_volumes_list: instantiation parameters for the each VDU as a list
+            disk_list:  to be filled up
+
+        """
+        # Find the ordinary volumes which are not added to the persistent_root_disk
+        persistent_disk = {}
+        for disk in target_vdu.get("virtual-storages", {}):
+            if (
+                disk.get("type-of-storage") == "persistent-storage:persistent-storage"
+                and disk["id"] not in persistent_root_disk.keys()
             ):
-                net_item["use"] = "mgmt"
-            else:
-                # if interface.get("type") in ("VIRTIO", "E1000", "PARAVIRT"):
-                net_item["use"] = "bridge"
-                net_item["model"] = interface.get("type")
+                for vdu_volume in vdu_instantiation_volumes_list:
 
-            if interface.get("ip-address"):
-                net_item["ip_address"] = interface["ip-address"]
+                    if vdu_volume["vim-volume-id"] and disk["id"] == vdu_volume["name"]:
 
-            if interface.get("mac-address"):
-                net_item["mac_address"] = interface["mac-address"]
+                        persistent_disk[disk["id"]] = {
+                            "vim_volume_id": vdu_volume["vim-volume-id"],
+                        }
+                        disk_list.append(persistent_disk[disk["id"]])
 
-            net_list.append(net_item)
+                else:
+                    if disk["id"] not in persistent_disk.keys():
+                        persistent_disk[disk["id"]] = {
+                            "size": disk.get("size-of-storage"),
+                            "keep": Ns.is_volume_keeping_required(disk),
+                        }
+                        disk_list.append(persistent_disk[disk["id"]])
 
-            if interface.get("mgmt-vnf"):
-                extra_dict["mgmt_vnf_interface"] = iface_index
-            elif interface.get("mgmt-interface"):
-                extra_dict["mgmt_vdu_interface"] = iface_index
+    @staticmethod
+    def is_volume_keeping_required(virtual_storage_desc: Dict[str, Any]) -> bool:
+        """Function to decide keeping persistent volume
+        upon VDU deletion.
+
+        Args:
+            virtual_storage_desc (Dict[str, Any]): virtual storage description dictionary
+
+        Returns:
+            bool (True/False)
+        """
+
+        if not virtual_storage_desc.get("vdu-storage-requirements"):
+            return False
+        for item in virtual_storage_desc.get("vdu-storage-requirements", {}):
+            if item.get("key") == "keep-volume" and item.get("value") == "true":
+                return True
+        return False
+
+    @staticmethod
+    def _sort_vdu_interfaces(target_vdu: dict) -> None:
+        """Sort the interfaces according to position number.
+
+        Args:
+            target_vdu  (dict):     Details of VDU to be created
+
+        """
+        # If the position info is provided for all the interfaces, it will be sorted
+        # according to position number ascendingly.
+        sorted_interfaces = sorted(
+            target_vdu["interfaces"],
+            key=lambda x: (x.get("position") is None, x.get("position")),
+        )
+        target_vdu["interfaces"] = sorted_interfaces
+
+    @staticmethod
+    def _partially_locate_vdu_interfaces(target_vdu: dict) -> None:
+        """Only place the interfaces which has specific position.
+
+        Args:
+            target_vdu  (dict):     Details of VDU to be created
+
+        """
+        # 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.
+        if any(
+            i.get("position") + 1
+            for i in target_vdu["interfaces"]
+            if i.get("position") is not None
+        ):
+            n = len(target_vdu["interfaces"])
+            sorted_interfaces = [-1] * n
+            k, m = 0, 0
+
+            while k < n:
+                if target_vdu["interfaces"][k].get("position") is not None:
+                    if any(i.get("position") == 0 for i in target_vdu["interfaces"]):
+                        idx = target_vdu["interfaces"][k]["position"] + 1
+                    else:
+                        idx = target_vdu["interfaces"][k]["position"]
+                    sorted_interfaces[idx - 1] = target_vdu["interfaces"][k]
+                k += 1
+
+            while m < n:
+                if target_vdu["interfaces"][m].get("position") is None:
+                    idy = sorted_interfaces.index(-1)
+                    sorted_interfaces[idy] = target_vdu["interfaces"][m]
+                m += 1
+
+            target_vdu["interfaces"] = sorted_interfaces
+
+    @staticmethod
+    def _prepare_vdu_cloud_init(
+        target_vdu: dict, vdu2cloud_init: dict, db: object, fs: object
+    ) -> Dict:
+        """Fill cloud_config dict with cloud init details.
 
+        Args:
+            target_vdu  (dict):         Details of VDU to be created
+            vdu2cloud_init  (dict):     Cloud init dict
+            db  (object):               DB object
+            fs  (object):               FS object
+
+        Returns:
+            cloud_config (dict):        Cloud config details of VDU
+
+        """
         # cloud config
         cloud_config = {}
 
@@ -1056,121 +1189,736 @@ class Ns(object):
         if target_vdu.get("boot-data-drive"):
             cloud_config["boot-data-drive"] = target_vdu.get("boot-data-drive")
 
-        ssh_keys = []
+        return cloud_config
 
-        if target_vdu.get("ssh-keys"):
-            ssh_keys += target_vdu.get("ssh-keys")
+    @staticmethod
+    def _check_vld_information_of_interfaces(
+        interface: dict, ns_preffix: str, vnf_preffix: str
+    ) -> Optional[str]:
+        """Prepare the net_text by the virtual link information for vnf and ns level.
+        Args:
+            interface   (dict):         Interface details
+            ns_preffix  (str):          Prefix of NS
+            vnf_preffix (str):          Prefix of VNF
 
-        if target_vdu.get("ssh-access-required"):
-            ssh_keys.append(ro_nsr_public_key)
+        Returns:
+            net_text    (str):          information of net
 
-        if ssh_keys:
-            cloud_config["key-pairs"] = ssh_keys
+        """
+        net_text = ""
+        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"]
 
-        disk_list = None
-        if target_vdu.get("virtual-storages"):
-            disk_list = [
-                {"size": disk["size-of-storage"]}
-                for disk in target_vdu["virtual-storages"]
-                if disk.get("type-of-storage")
-                == "persistent-storage:persistent-storage"
-            ]
+        return net_text
 
-        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": disk_list,
-            "availability_zone_index": None,  # TODO
-            "availability_zone_list": None,  # TODO
-        }
+    @staticmethod
+    def _prepare_interface_port_security(interface: dict) -> None:
+        """
 
-        return extra_dict
+        Args:
+            interface   (dict):     Interface details
 
-    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`)
+        """
+        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"
+            )
+
+    @staticmethod
+    def _create_net_item_of_interface(interface: dict, net_text: str) -> dict:
+        """Prepare net item including name, port security, floating ip etc.
 
         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
+            interface   (dict):         Interface details
+            net_text    (str):          information of net
 
         Returns:
-            List: list with the incremental changes (deletes, creates) for each item
-            number: current task index
+            net_item    (dict):         Dict including net details
+
         """
 
-        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"]
+        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"
 
-        # 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"):
-            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, [])
-            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"):
-            db_record = "nsrs:{}:{}".format(nsr_id, db_path)
-            target_list = indata.get(item, [])
-            existing_list = db_nsr.get(item, [])
-        else:
+        return net_item
+
+    @staticmethod
+    def _prepare_type_of_interface(
+        interface: dict, tasks_by_target_record_id: dict, net_text: str, net_item: dict
+    ) -> None:
+        """Fill the net item type by interface type such as SR-IOV, OM-MGMT, bridge etc.
+
+        Args:
+            interface   (dict):                     Interface details
+            tasks_by_target_record_id   (dict):     Task details
+            net_text    (str):                      information of net
+            net_item    (dict):                     Dict including net details
+
+        """
+        # 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")
+
+    @staticmethod
+    def _prepare_vdu_interfaces(
+        target_vdu: dict,
+        extra_dict: dict,
+        ns_preffix: str,
+        vnf_preffix: str,
+        logger: object,
+        tasks_by_target_record_id: dict,
+        net_list: list,
+    ) -> None:
+        """Prepare the net_item and add net_list, add mgmt interface to extra_dict.
+
+        Args:
+            target_vdu  (dict):                             VDU to be created
+            extra_dict  (dict):                             Dictionary to be filled
+            ns_preffix  (str):                              NS prefix as string
+            vnf_preffix (str):                              VNF prefix as string
+            logger  (object):                               Logger Object
+            tasks_by_target_record_id  (dict):              Task details
+            net_list    (list):                             Net list of VDU
+        """
+        for iface_index, interface in enumerate(target_vdu["interfaces"]):
+
+            net_text = Ns._check_vld_information_of_interfaces(
+                interface, ns_preffix, vnf_preffix
+            )
+            if not net_text:
+                # Interface not connected to any vld
+                logger.error(
+                    "Interface {} from vdu {} not connected to any vld".format(
+                        iface_index, target_vdu["vdu-name"]
+                    )
+                )
+                continue
+
+            extra_dict["depends_on"].append(net_text)
+
+            Ns._prepare_interface_port_security(interface)
+
+            net_item = Ns._create_net_item_of_interface(interface, net_text)
+
+            Ns._prepare_type_of_interface(
+                interface, tasks_by_target_record_id, net_text, net_item
+            )
+
+            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
+
+    @staticmethod
+    def _prepare_vdu_ssh_keys(
+        target_vdu: dict, ro_nsr_public_key: dict, cloud_config: dict
+    ) -> None:
+        """Add ssh keys to cloud config.
+
+        Args:
+           target_vdu  (dict):                 Details of VDU to be created
+           ro_nsr_public_key   (dict):          RO NSR public Key
+           cloud_config  (dict):               Cloud config details
+
+        """
+        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
+
+    @staticmethod
+    def _select_persistent_root_disk(vsd: dict, vdu: dict) -> dict:
+        """Selects the persistent root disk if exists.
+        Args:
+            vsd (dict):             Virtual storage descriptors in VNFD
+            vdu (dict):             VNF descriptor
+
+        Returns:
+            root_disk   (dict):     Selected persistent root disk
+        """
+        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"
+            ):
+                return root_disk
+
+    @staticmethod
+    def _add_persistent_root_disk_to_disk_list(
+        vnfd: dict, target_vdu: dict, persistent_root_disk: dict, disk_list: list
+    ) -> None:
+        """Find the persistent root disk and add to disk list.
+
+        Args:
+            vnfd  (dict):                           VNF descriptor
+            target_vdu  (dict):                     Details of VDU to be created
+            persistent_root_disk    (dict):         Details of persistent root disk
+            disk_list   (list):                     Disks of VDU
+
+        """
+        for vdu in vnfd.get("vdu", ()):
+            if vdu["name"] == target_vdu["vdu-name"]:
+                for vsd in vnfd.get("virtual-storage-desc", ()):
+                    root_disk = Ns._select_persistent_root_disk(vsd, vdu)
+                    if not root_disk:
+                        continue
+
+                    persistent_root_disk[vsd["id"]] = {
+                        "image_id": vdu.get("sw-image-desc"),
+                        "size": root_disk["size-of-storage"],
+                        "keep": Ns.is_volume_keeping_required(root_disk),
+                    }
+
+                    disk_list.append(persistent_root_disk[vsd["id"]])
+                    break
+
+    @staticmethod
+    def _add_persistent_ordinary_disks_to_disk_list(
+        target_vdu: dict,
+        persistent_root_disk: dict,
+        persistent_ordinary_disk: dict,
+        disk_list: list,
+    ) -> None:
+        """Fill the disk list by adding persistent ordinary disks.
+
+        Args:
+            target_vdu  (dict):                     Details of VDU to be created
+            persistent_root_disk    (dict):         Details of persistent root disk
+            persistent_ordinary_disk    (dict):     Details of persistent ordinary disk
+            disk_list   (list):                     Disks of VDU
+
+        """
+        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()
+                ):
+                    persistent_ordinary_disk[disk["id"]] = {
+                        "size": disk["size-of-storage"],
+                        "keep": Ns.is_volume_keeping_required(disk),
+                    }
+                    disk_list.append(persistent_ordinary_disk[disk["id"]])
+
+    @staticmethod
+    def _prepare_vdu_affinity_group_list(
+        target_vdu: dict, extra_dict: dict, ns_preffix: str
+    ) -> List[Dict[str, any]]:
+        """Process affinity group details to prepare affinity group list.
+
+        Args:
+            target_vdu  (dict):     Details of VDU to be created
+            extra_dict  (dict):     Dictionary to be filled
+            ns_preffix  (str):      Prefix as string
+
+        Returns:
+
+            affinity_group_list (list):     Affinity group details
+
+        """
+        affinity_group_list = []
+
+        if target_vdu.get("affinity-or-anti-affinity-group-id"):
+            for affinity_group_id in target_vdu["affinity-or-anti-affinity-group-id"]:
+                affinity_group = {}
+                affinity_group_text = (
+                    ns_preffix + ":affinity-or-anti-affinity-group." + affinity_group_id
+                )
+
+                if not isinstance(extra_dict.get("depends_on"), list):
+                    raise NsException("Invalid extra_dict format.")
+
+                extra_dict["depends_on"].append(affinity_group_text)
+                affinity_group["affinity_group_id"] = "TASK-" + affinity_group_text
+                affinity_group_list.append(affinity_group)
+
+        return affinity_group_list
+
+    @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 = []
+
+        persistent_root_disk = {}
+        persistent_ordinary_disk = {}
+        vdu_instantiation_volumes_list = []
+        disk_list = []
+        vnfd_id = vnfr["vnfd-id"]
+        vnfd = db.get_one("vnfds", {"_id": vnfd_id})
+
+        # If the position info is provided for all the interfaces, it will be sorted
+        # according to position number ascendingly.
+        if all(
+            True if i.get("position") is not None else False
+            for i in target_vdu["interfaces"]
+        ):
+
+            Ns._sort_vdu_interfaces(target_vdu)
+
+        # 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:
+
+            Ns._partially_locate_vdu_interfaces(target_vdu)
+
+        # If the position info is not provided for the interfaces, interfaces will be attached
+        # according to the order in the VNFD.
+        Ns._prepare_vdu_interfaces(
+            target_vdu,
+            extra_dict,
+            ns_preffix,
+            vnf_preffix,
+            logger,
+            tasks_by_target_record_id,
+            net_list,
+        )
+
+        # cloud config
+        cloud_config = Ns._prepare_vdu_cloud_init(target_vdu, vdu2cloud_init, db, fs)
+
+        # Prepare VDU ssh keys
+        Ns._prepare_vdu_ssh_keys(target_vdu, ro_nsr_public_key, cloud_config)
+
+        if target_vdu.get("additionalParams"):
+            vdu_instantiation_volumes_list = (
+                target_vdu.get("additionalParams").get("OSM").get("vdu_volumes")
+            )
+
+        if vdu_instantiation_volumes_list:
+
+            # Find the root volumes and add to the disk_list
+            persistent_root_disk = Ns.find_persistent_root_volumes(
+                vnfd, target_vdu, vdu_instantiation_volumes_list, disk_list
+            )
+
+            # Find the ordinary volumes which are not added to the persistent_root_disk
+            # and put them to the disk list
+            Ns.find_persistent_volumes(
+                persistent_root_disk,
+                target_vdu,
+                vdu_instantiation_volumes_list,
+                disk_list,
+            )
+
+        else:
+            # Vdu_instantiation_volumes_list is empty
+            # First get add the persistent root disks to disk_list
+            Ns._add_persistent_root_disk_to_disk_list(
+                vnfd, target_vdu, persistent_root_disk, disk_list
+            )
+            # Add the persistent non-root disks to disk_list
+            Ns._add_persistent_ordinary_disks_to_disk_list(
+                target_vdu, persistent_root_disk, persistent_ordinary_disk, disk_list
+            )
+
+        affinity_group_list = Ns._prepare_vdu_affinity_group_list(
+            target_vdu, extra_dict, ns_preffix
+        )
+
+        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
@@ -1204,7 +1952,7 @@ class Ns(object):
                     target_record_id = "{}.{}".format(db_record, existing_item["id"])
                     item_ = item
 
-                    if target_vim.startswith("sdn"):
+                    if target_vim.startswith("sdn") or target_vim.startswith("wim"):
                         # item must be sdn-net instead of net if target_vim is a sdn
                         item_ = "sdn_net"
                         target_record_id += ".sdn"
@@ -1252,13 +2000,27 @@ class Ns(object):
                 target_record_id = "{}.{}".format(db_record, target_item["id"])
                 item_ = item
 
-                if target_vim.startswith("sdn"):
+                if target_vim.startswith("sdn") or target_vim.startswith("wim"):
                     # item must be sdn-net instead of net if target_vim is a sdn
                     item_ = "sdn_net"
                     target_record_id += ".sdn"
 
                 kwargs = {}
+                self.logger.debug(
+                    "ns.calculate_diff_items target_item={}".format(target_item)
+                )
+                if process_params == Ns._process_flavor_params:
+                    kwargs.update(
+                        {
+                            "db": self.db,
+                        }
+                    )
+                    self.logger.debug(
+                        "calculate_diff_items for flavor kwargs={}".format(kwargs)
+                    )
+
                 if process_params == Ns._process_vdu_params:
+                    self.logger.debug("calculate_diff_items self.fs={}".format(self.fs))
                     kwargs.update(
                         {
                             "vnfr_id": vnfr_id,
@@ -1272,6 +2034,7 @@ class Ns(object):
                             "ro_nsr_public_key": ro_nsr_public_key,
                         }
                     )
+                    self.logger.debug("calculate_diff_items kwargs={}".format(kwargs))
 
                 extra_dict = process_params(
                     target_item,
@@ -1342,7 +2105,7 @@ class Ns(object):
         changes_list = []
 
         # NS vld, image and flavor
-        for item in ["net", "image", "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,
@@ -1409,65 +2172,417 @@ class Ns(object):
                 extra_dict=change.get("extra_dict", None),
             )
 
-            tasks_by_target_record_id[change["target_record_id"]] = task
-            db_new_tasks.append(task)
+            self.logger.debug("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.debug("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.debug("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 change.get("common_id"):
-                task["common_id"] = change["common_id"]
+            if not db_vnfrs_list:
+                raise NsException("Cannot obtain associated VNF for ns")
 
-    def upload_all_tasks(
-        self,
-        db_new_tasks,
-        now,
-    ):
-        """Function to save all tasks in the common DB
+            for vnfr in db_vnfrs_list:
+                db_vnfrs[vnfr["_id"]] = vnfr
 
-        Args:
-            db_new_tasks (List): tasks list to be created
-            now (time): current time
+            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)
 
-        nb_ro_tasks = 0  # for logging
+            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,
+                )
 
-        for db_task in db_new_tasks:
-            target_id = db_task.pop("target_id")
-            common_id = db_task.get("common_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,
+                )
 
-            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
+                # 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,
+                                )
 
-            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
-                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)
+                step = "Updating database, Appending tasks to ro_tasks"
+                self.upload_recreate_tasks(
+                    db_new_tasks=db_new_tasks,
+                    now=now,
+                )
 
-        self.logger.debug(
-            "Created {} ro_tasks; {} tasks - db_new_tasks={}".format(
-                nb_ro_tasks, len(db_new_tasks), db_new_tasks
+            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))
@@ -1485,6 +2600,7 @@ class Ns(object):
         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
@@ -1497,6 +2613,7 @@ class Ns(object):
             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)
@@ -1676,8 +2793,11 @@ class Ns(object):
         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
@@ -1696,7 +2816,7 @@ class Ns(object):
                         error_text = "Error at {} {}: {}".format(
                             task["action"].lower(),
                             task["item"],
-                            ro_task["vim_info"].get("vim_details") or "unknown",
+                            ro_task["vim_info"].get("vim_message") or "unknown",
                         )
                         details.append(error_text)
                     elif task["status"] in ("SCHEDULED", "BUILD"):
@@ -1717,6 +2837,11 @@ class Ns(object):
 
         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(
@@ -1726,6 +2851,99 @@ class Ns(object):
 
         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 = []
@@ -1745,3 +2963,215 @@ class Ns(object):
                     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)
+
+    def verticalscale_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="verticalscale",
+            action="EXEC",
+            target_record=target_record,
+            target_record_id=target_record_id,
+            extra_dict=extra_dict,
+        )
+        return task
+
+    def verticalscale(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:
+            VnfFlavorData = indata.get("changeVnfFlavorData")
+            vnf_instance_id = VnfFlavorData["vnfInstanceId"]
+            step = "Getting vnfrs from db"
+            db_vnfr = self.db.get_one("vnfrs", {"_id": vnf_instance_id})
+            vduid = VnfFlavorData["additionalParams"]["vduid"]
+            vduCountIndex = VnfFlavorData["additionalParams"]["vduCountIndex"]
+            virtualMemory = VnfFlavorData["additionalParams"]["virtualMemory"]
+            numVirtualCpu = VnfFlavorData["additionalParams"]["numVirtualCpu"]
+            sizeOfStorage = VnfFlavorData["additionalParams"]["sizeOfStorage"]
+            flavor_dict = {
+                "name": vduid + "-flv",
+                "ram": virtualMemory,
+                "vcpus": numVirtualCpu,
+                "disk": sizeOfStorage,
+            }
+            db_new_tasks = []
+            step = "Creating Tasks for vertical scaling"
+            with self.write_lock:
+                for vdu_index, vdu in enumerate(db_vnfr["vdur"]):
+                    if (
+                        vdu["vdu-id-ref"] == vduid
+                        and vdu["count-index"] == vduCountIndex
+                    ):
+                        extra_dict["params"] = {
+                            "vim_vm_id": vdu["vim-id"],
+                            "flavor_dict": flavor_dict,
+                        }
+                        task = self.verticalscale_task(
+                            vdu,
+                            db_vnfr,
+                            vdu_index,
+                            action_id,
+                            nsr_id,
+                            task_index,
+                            extra_dict,
+                        )
+                        db_new_tasks.append(task)
+                        task_index += 1
+                        break
+                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)