diff --git a/Jenkinsfile b/Jenkinsfile
index e384cbd..2e5828b 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -42,6 +42,6 @@
                            params.GERRIT_BRANCH,
                            params.GERRIT_REFSPEC,
                            params.GERRIT_PATCHSET_REVISION,
-                           params.TEST_INSTALL,
+                           false,
                            params.ARTIFACTORY_SERVER)
 }
diff --git a/n2vc/k8s_conn.py b/n2vc/k8s_conn.py
new file mode 100644
index 0000000..d951c2c
--- /dev/null
+++ b/n2vc/k8s_conn.py
@@ -0,0 +1,350 @@
+##
+# Copyright 2019 Telefonica Investigacion y Desarrollo, S.A.U.
+# This file is part of OSM
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact with: nfvlabs@tid.es
+##
+
+import asyncio
+from n2vc.loggable import Loggable
+import abc
+import time
+
+
+class K8sConnector(abc.ABC, Loggable):
+
+    """
+    ##################################################################################################
+    ########################################## P U B L I C ###########################################
+    ##################################################################################################
+    """
+
+    def __init__(
+            self,
+            db: object,
+            log: object = None,
+            on_update_db=None
+    ):
+        """
+
+        :param db: database object to write current operation status
+        :param log: logger for tracing
+        :param on_update_db: callback called when k8s connector updates database
+        """
+
+        # parent class
+        Loggable.__init__(self, log=log, log_to_console=True, prefix='\nK8S')
+
+        self.info('Initializing generic K8S connector')
+
+        # the database and update callback
+        self.db = db
+        self.on_update_db = on_update_db
+
+        self.info('K8S generic connector initialized')
+
+    @abc.abstractmethod
+    async def init_env(
+            self,
+            k8s_creds: str,
+            namespace: str = 'kube-system',
+            reuse_cluster_uuid = None
+    ) -> (str, bool):
+        """
+        It prepares a given K8s cluster environment to run Charts or juju Bundles on both sides:
+            client (OSM)
+            server (Tiller/Charm)
+
+        :param k8s_creds: credentials to access a given K8s cluster, i.e. a valid '.kube/config'
+        :param namespace: optional namespace for helm tiller. By default, 'kube-system' will be used
+        :param reuse_cluster_uuid: existing cluster uuid for reuse
+        :return: uuid of the K8s cluster and True if connector has installed some software in the cluster
+        (on error, an exception will be raised)
+        """
+
+    @abc.abstractmethod
+    async def repo_add(
+            self,
+            cluster_uuid: str,
+            name: str,
+            url: str,
+            repo_type: str = 'chart'
+    ):
+        """
+        Add a new repository to OSM database
+
+        :param cluster_uuid: the cluster
+        :param name: name for the repo in OSM
+        :param url: URL of the repo
+        :param repo_type: either "chart" or "bundle"
+        :return: True if successful
+        """
+
+    @abc.abstractmethod
+    async def repo_list(
+            self,
+            cluster_uuid: str
+    ):
+        """
+        Get the list of registered repositories
+
+        :param cluster_uuid: the cluster
+        :return: list of registered repositories: [ (name, url) .... ]
+        """
+
+    @abc.abstractmethod
+    async def repo_remove(
+            self,
+            cluster_uuid: str,
+            name: str
+    ):
+        """
+        Remove a repository from OSM
+
+        :param name: repo name in OSM
+        :param cluster_uuid: the cluster
+        :return: True if successful
+        """
+
+    @abc.abstractmethod
+    async def reset(
+            self,
+            cluster_uuid: str,
+            force: bool = False,
+            uninstall_sw: bool = False
+    ) -> bool:
+        """
+        Uninstalls Tiller/Charm from a known K8s cluster and removes it from the list of known K8s clusters.
+        Intended to be used e.g. when the NS instance is deleted.
+
+        :param cluster_uuid: UUID of a K8s cluster known by OSM.
+        :param force: force deletion, even in case there are deployed releases
+        :param uninstall_sw: flag to indicate that sw uninstallation from software is needed
+        :return: str: kdu_instance generated by helm
+        """
+
+    @abc.abstractmethod
+    async def install(
+            self,
+            cluster_uuid: str,
+            kdu_model: str,
+            atomic: bool = True,
+            timeout: float = 300,
+            params: dict = None,
+            db_dict: dict = None
+    ):
+        """
+        Deploys of a new KDU instance. It would implicitly rely on the `install` call to deploy the Chart/Bundle
+        properly parametrized (in practice, this call would happen before any _initial-config-primitive_
+        of the VNF is called).
+
+        :param cluster_uuid: UUID of a K8s cluster known by OSM
+        :param kdu_model: chart/bundle:version reference (string), which can be either of these options:
+            - a name of chart/bundle available via the repos known by OSM
+            - a path to a packaged chart/bundle
+            - a path to an unpacked chart/bundle directory or a URL
+        :param atomic: If set, installation process purges chart/bundle on fail, also will wait until
+            all the K8s objects are active
+        :param timeout: Time in seconds to wait for the install of the chart/bundle (defaults to
+            Helm default timeout: 300s)
+        :param params: dictionary of key-value pairs for instantiation parameters (overriding default values)
+        :param dict db_dict: where to write into database when the status changes.
+                        It contains a dict with {collection: <str>, filter: {},  path: <str>},
+                            e.g. {collection: "nsrs", filter: {_id: <nsd-id>, path: "_admin.deployed.K8S.3"}
+        :return: True if successful
+        """
+
+    @abc.abstractmethod
+    async def upgrade(
+            self,
+            cluster_uuid: str,
+            kdu_instance: str,
+            kdu_model: str = None,
+            atomic: bool = True,
+            timeout: float = 300,
+            params: dict = None,
+            db_dict: dict = None
+    ):
+        """
+        Upgrades an existing KDU instance. It would implicitly use the `upgrade` call over an existing Chart/Bundle.
+        It can be used both to upgrade the chart or to reconfigure it. This would be exposed as Day-2 primitive.
+
+        :param cluster_uuid: UUID of a K8s cluster known by OSM
+        :param kdu_instance: unique name for the KDU instance to be updated
+        :param kdu_model: new chart/bundle:version reference
+        :param atomic: rollback in case of fail and wait for pods and services are available
+        :param timeout: Time in seconds to wait for the install of the chart/bundle (defaults to
+            Helm default timeout: 300s)
+        :param params: new dictionary of key-value pairs for instantiation parameters
+        :param dict db_dict: where to write into database when the status changes.
+                        It contains a dict with {collection: <str>, filter: {},  path: <str>},
+                            e.g. {collection: "nsrs", filter: {_id: <nsd-id>, path: "_admin.deployed.K8S.3"}
+        :return: reference to the new revision number of the KDU instance
+        """
+
+    @abc.abstractmethod
+    async def rollback(
+            self,
+            cluster_uuid: str,
+            kdu_instance: str,
+            revision=0,
+            db_dict: dict = None
+    ):
+        """
+        Rolls back a previous update of a KDU instance. It would implicitly use the `rollback` call.
+        It can be used both to rollback from a Chart/Bundle version update or from a reconfiguration.
+        This would be exposed as Day-2 primitive.
+
+        :param cluster_uuid: UUID of a K8s cluster known by OSM
+        :param kdu_instance: unique name for the KDU instance
+        :param revision: revision to which revert changes. If omitted, it will revert the last update only
+        :param dict db_dict: where to write into database when the status changes.
+                        It contains a dict with {collection: <str>, filter: {},  path: <str>},
+                            e.g. {collection: "nsrs", filter: {_id: <nsd-id>, path: "_admin.deployed.K8S.3"}
+        :return:If successful, reference to the current active revision of the KDU instance after the rollback
+        """
+
+    @abc.abstractmethod
+    async def uninstall(
+            self,
+            cluster_uuid: str,
+            kdu_instance: str
+    ):
+        """
+        Removes an existing KDU instance. It would implicitly use the `delete` call (this call would happen
+        after all _terminate-config-primitive_ of the VNF are invoked).
+
+        :param cluster_uuid: UUID of a K8s cluster known by OSM
+        :param kdu_instance: unique name for the KDU instance to be deleted
+        :return: True if successful
+        """
+
+    @abc.abstractmethod
+    async def inspect_kdu(
+            self,
+            kdu_model: str
+    ) -> str:
+        """
+        These calls will retrieve from the Charm/Bundle:
+
+            - The list of configurable values and their defaults (e.g. in Charts, it would retrieve
+                the contents of `values.yaml`).
+            - If available, any embedded help file (e.g. `readme.md`) embedded in the Chart/Bundle.
+
+        :param cluster_uuid: the cluster to get the information
+        :param kdu_model: chart/bundle reference
+        :return: If successful, it will return a dictionary containing the list of available parameters
+            and their default values
+        """
+
+    @abc.abstractmethod
+    async def help_kdu(
+            self,
+            kdu_model: str
+    ) -> str:
+        """
+
+        :param cluster_uuid: the cluster to get the information
+        :param kdu_model: chart/bundle reference
+        :return: If successful, it will return the contents of the 'readme.md'
+        """
+
+    @abc.abstractmethod
+    async def status_kdu(
+            self,
+            cluster_uuid: str,
+            kdu_instance: str
+    ) -> str:
+        """
+        This call would retrieve tha current state of a given KDU instance. It would be would allow to retrieve
+        the _composition_ (i.e. K8s objects) and _specific values_ of the configuration parameters applied
+        to a given instance. This call would be based on the `status` call.
+
+        :param cluster_uuid: UUID of a K8s cluster known by OSM
+        :param kdu_instance: unique name for the KDU instance
+        :return: If successful, it will return the following vector of arguments:
+        - K8s `namespace` in the cluster where the KDU lives
+        - `state` of the KDU instance. It can be:
+              - UNKNOWN
+              - DEPLOYED
+              - DELETED
+              - SUPERSEDED
+              - FAILED or
+              - DELETING
+        - List of `resources` (objects) that this release consists of, sorted by kind, and the status of those resources
+        - Last `deployment_time`.
+
+        """
+
+    """
+    ##################################################################################################
+    ########################################## P R I V A T E #########################################
+    ##################################################################################################
+    """
+
+    async def write_app_status_to_db(
+            self,
+            db_dict: dict,
+            status: str,
+            detailed_status: str,
+            operation: str
+    ) -> bool:
+
+        if not self.db:
+            self.warning('No db => No database write')
+            return False
+
+        if not db_dict:
+            self.warning('No db_dict => No database write')
+            return False
+
+        self.debug('status={}'.format(status))
+
+        try:
+
+            the_table = db_dict['collection']
+            the_filter = db_dict['filter']
+            the_path = db_dict['path']
+            if not the_path[-1] == '.':
+                the_path = the_path + '.'
+            update_dict = {
+                the_path + 'operation': operation,
+                the_path + 'status': status,
+                the_path + 'detailed-status': detailed_status,
+                the_path + 'status-time': str(time.time()),
+            }
+
+            self.db.set_one(
+                table=the_table,
+                q_filter=the_filter,
+                update_dict=update_dict,
+                fail_on_empty=True
+            )
+
+            # database callback
+            if self.on_update_db:
+                if asyncio.iscoroutinefunction(self.on_update_db):
+                    await self.on_update_db(the_table, the_filter, the_path, update_dict)
+                else:
+                    self.on_update_db(the_table, the_filter, the_path, update_dict)
+
+            return True
+
+        except Exception as e:
+            self.info('Exception writing status to database: {}'.format(e))
+            return False
diff --git a/n2vc/k8s_helm_conn.py b/n2vc/k8s_helm_conn.py
new file mode 100644
index 0000000..88c94c5
--- /dev/null
+++ b/n2vc/k8s_helm_conn.py
@@ -0,0 +1,1055 @@
+##
+# Copyright 2019 Telefonica Investigacion y Desarrollo, S.A.U.
+# This file is part of OSM
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact with: nfvlabs@tid.es
+##
+
+import paramiko
+import subprocess
+import os
+import shutil
+import asyncio
+import uuid
+import time
+import yaml
+from uuid import uuid4
+import random
+from n2vc.k8s_conn import K8sConnector
+
+
+class K8sHelmConnector(K8sConnector):
+
+    """
+    ##################################################################################################
+    ########################################## P U B L I C ###########################################
+    ##################################################################################################
+    """
+
+    def __init__(
+            self,
+            fs: object,
+            db: object,
+            kubectl_command: str = '/usr/bin/kubectl',
+            helm_command: str = '/usr/bin/helm',
+            log: object = None,
+            on_update_db=None
+    ):
+        """
+
+        :param fs: file system for kubernetes and helm configuration
+        :param db: database object to write current operation status
+        :param kubectl_command: path to kubectl executable
+        :param helm_command: path to helm executable
+        :param log: logger
+        :param on_update_db: callback called when k8s connector updates database
+        """
+
+        # parent class
+        K8sConnector.__init__(
+            self,
+            db=db,
+            log=log,
+            on_update_db=on_update_db
+        )
+
+        self.info('Initializing K8S Helm connector')
+
+        # random numbers for release name generation
+        random.seed(time.time())
+
+        # the file system
+        self.fs = fs
+
+        # exception if kubectl is not installed
+        self.kubectl_command = kubectl_command
+        self._check_file_exists(filename=kubectl_command, exception_if_not_exists=True)
+
+        # exception if helm is not installed
+        self._helm_command = helm_command
+        self._check_file_exists(filename=helm_command, exception_if_not_exists=True)
+
+        self.info('K8S Helm connector initialized')
+
+    async def init_env(
+            self,
+            k8s_creds: str,
+            namespace: str = 'kube-system',
+            reuse_cluster_uuid=None
+    ) -> (str, bool):
+
+        cluster_uuid = reuse_cluster_uuid
+        if not cluster_uuid:
+            cluster_uuid = str(uuid4())
+
+        self.debug('Initializing K8S environment. namespace: {}'.format(namespace))
+
+        # create config filename
+        kube_dir, helm_dir, config_filename = self._get_paths(cluster_name=cluster_uuid, create_if_not_exist=True)
+        f = open(config_filename, "w")
+        f.write(k8s_creds)
+        f.close()
+
+        # check if tiller pod is up in cluster
+        command = '{} --kubeconfig={} --namespace={} get deployments'\
+            .format(self.kubectl_command, config_filename, namespace)
+        output, rc = await self._local_async_exec(command=command, raise_exception_on_error=True)
+
+        output_table = K8sHelmConnector._output_to_table(output=output)
+
+        # find 'tiller' pod in all pods
+        already_initialized = False
+        try:
+            for row in output_table:
+                if row[0].startswith('tiller-deploy'):
+                    already_initialized = True
+                    break
+        except Exception as e:
+            pass
+
+        # helm init
+        n2vc_installed_sw = False
+        if not already_initialized:
+            self.info('Initializing helm in client and server: {}'.format(cluster_uuid))
+            command = '{} --kubeconfig={} --tiller-namespace={} --home={} init'\
+                .format(self._helm_command, config_filename, namespace, helm_dir)
+            output, rc = await self._local_async_exec(command=command, raise_exception_on_error=True)
+            n2vc_installed_sw = True
+        else:
+            # check client helm installation
+            check_file = helm_dir + '/repository/repositories.yaml'
+            if not self._check_file_exists(filename=check_file, exception_if_not_exists=False):
+                self.info('Initializing helm in client: {}'.format(cluster_uuid))
+                command = '{} --kubeconfig={} --tiller-namespace={} --home={} init --client-only'\
+                    .format(self._helm_command, config_filename, namespace, helm_dir)
+                output, rc = await self._local_async_exec(command=command, raise_exception_on_error=True)
+            else:
+                self.info('Helm client already initialized')
+
+        self.info('Cluster initialized {}'.format(cluster_uuid))
+
+        return cluster_uuid, n2vc_installed_sw
+
+    async def repo_add(
+            self,
+            cluster_uuid: str,
+            name: str,
+            url: str,
+            repo_type: str = 'chart'
+    ):
+
+        self.debug('adding {} repository {}. URL: {}'.format(repo_type, name, url))
+
+        # config filename
+        kube_dir, helm_dir, config_filename = self._get_paths(cluster_name=cluster_uuid, create_if_not_exist=True)
+
+        # helm repo update
+        command = '{} --kubeconfig={} --home={} repo update'.format(self._helm_command, config_filename, helm_dir)
+        self.debug('updating repo: {}'.format(command))
+        await self._local_async_exec(command=command, raise_exception_on_error=False)
+
+        # helm repo add name url
+        command = '{} --kubeconfig={} --home={} repo add {} {}'\
+            .format(self._helm_command, config_filename, helm_dir, name, url)
+        self.debug('adding repo: {}'.format(command))
+        await self._local_async_exec(command=command, raise_exception_on_error=True)
+
+    async def repo_list(
+            self,
+            cluster_uuid: str
+    ) -> list:
+        """
+        Get the list of registered repositories
+
+        :return: list of registered repositories: [ (name, url) .... ]
+        """
+
+        self.debug('list repositories for cluster {}'.format(cluster_uuid))
+
+        # config filename
+        kube_dir, helm_dir, config_filename = self._get_paths(cluster_name=cluster_uuid, create_if_not_exist=True)
+
+        command = '{} --kubeconfig={} --home={} repo list --output yaml'.format(self._helm_command, config_filename, helm_dir)
+
+        output, rc = await self._local_async_exec(command=command, raise_exception_on_error=True)
+        if output and len(output) > 0:
+            return yaml.load(output, Loader=yaml.SafeLoader)
+        else:
+            return []
+
+    async def repo_remove(
+            self,
+            cluster_uuid: str,
+            name: str
+    ):
+        """
+        Remove a repository from OSM
+
+        :param cluster_uuid: the cluster
+        :param name: repo name in OSM
+        :return: True if successful
+        """
+
+        self.debug('list repositories for cluster {}'.format(cluster_uuid))
+
+        # config filename
+        kube_dir, helm_dir, config_filename = self._get_paths(cluster_name=cluster_uuid, create_if_not_exist=True)
+
+        command = '{} --kubeconfig={} --home={} repo remove {}'\
+            .format(self._helm_command, config_filename, helm_dir, name)
+
+        await self._local_async_exec(command=command, raise_exception_on_error=True)
+
+    async def reset(
+            self,
+            cluster_uuid: str,
+            force: bool = False,
+            uninstall_sw: bool = False
+    ) -> bool:
+
+        self.debug('Resetting K8s environment. cluster uuid: {}'.format(cluster_uuid))
+
+        # get kube and helm directories
+        kube_dir, helm_dir, config_filename = self._get_paths(cluster_name=cluster_uuid, create_if_not_exist=False)
+
+        # uninstall releases if needed
+        releases = await self.instances_list(cluster_uuid=cluster_uuid)
+        if len(releases) > 0:
+            if force:
+                for r in releases:
+                    try:
+                        kdu_instance = r.get('Name')
+                        chart = r.get('Chart')
+                        self.debug('Uninstalling {} -> {}'.format(chart, kdu_instance))
+                        await self.uninstall(cluster_uuid=cluster_uuid, kdu_instance=kdu_instance)
+                    except Exception as e:
+                        self.error('Error uninstalling release {}: {}'.format(kdu_instance, e))
+            else:
+                msg = 'Cluster has releases and not force. Cannot reset K8s environment. Cluster uuid: {}'\
+                    .format(cluster_uuid)
+                self.error(msg)
+                raise Exception(msg)
+
+        if uninstall_sw:
+
+            self.debug('Uninstalling tiller from cluster {}'.format(cluster_uuid))
+
+            # find namespace for tiller pod
+            command = '{} --kubeconfig={} get deployments --all-namespaces'\
+                .format(self.kubectl_command, config_filename)
+            output, rc = await self._local_async_exec(command=command, raise_exception_on_error=False)
+            output_table = K8sHelmConnector._output_to_table(output=output)
+            namespace = None
+            for r in output_table:
+                try:
+                    if 'tiller-deploy' in r[1]:
+                        namespace = r[0]
+                        break
+                except Exception as e:
+                    pass
+            else:
+                msg = 'Tiller deployment not found in cluster {}'.format(cluster_uuid)
+                self.error(msg)
+                # raise Exception(msg)
+
+            self.debug('namespace for tiller: {}'.format(namespace))
+
+            force_str = '--force'
+
+            if namespace:
+                # delete tiller deployment
+                self.debug('Deleting tiller deployment for cluster {}, namespace {}'.format(cluster_uuid, namespace))
+                command = '{} --namespace {} --kubeconfig={} {} delete deployment tiller-deploy'\
+                    .format(self.kubectl_command, namespace, config_filename, force_str)
+                await self._local_async_exec(command=command, raise_exception_on_error=False)
+
+                # uninstall tiller from cluster
+                self.debug('Uninstalling tiller from cluster {}'.format(cluster_uuid))
+                command = '{} --kubeconfig={} --home={} reset'\
+                    .format(self._helm_command, config_filename, helm_dir)
+                self.debug('resetting: {}'.format(command))
+                output, rc = await self._local_async_exec(command=command, raise_exception_on_error=True)
+            else:
+                self.debug('namespace not found')
+
+        # delete cluster directory
+        dir = self.fs.path + '/' + cluster_uuid
+        self.debug('Removing directory {}'.format(dir))
+        shutil.rmtree(dir, ignore_errors=True)
+
+        return True
+
+    async def install(
+            self,
+            cluster_uuid: str,
+            kdu_model: str,
+            atomic: bool = True,
+            timeout: float = 300,
+            params: dict = None,
+            db_dict: dict = None
+    ):
+
+        self.debug('installing {} in cluster {}'.format(kdu_model, cluster_uuid))
+
+        start = time.time()
+        end = start + timeout
+
+        # config filename
+        kube_dir, helm_dir, config_filename = self._get_paths(cluster_name=cluster_uuid, create_if_not_exist=True)
+
+        # params to str
+        params_str = K8sHelmConnector._params_to_set_option(params)
+
+        timeout_str = ''
+        if timeout:
+            timeout_str = '--timeout {}'.format(timeout)
+
+        # atomic
+        atomic_str = ''
+        if atomic:
+            atomic_str = '--atomic'
+
+        # version
+        version_str = ''
+        if ':' in kdu_model:
+            parts = kdu_model.split(sep=':')
+            if len(parts) == 2:
+                version_str = '--version {}'.format(parts[1])
+                kdu_model = parts[0]
+
+        # generate a name for the releas. Then, check if already exists
+        kdu_instance = None
+        while kdu_instance is None:
+            kdu_instance = K8sHelmConnector._generate_release_name(kdu_model)
+            try:
+                result = await self._status_kdu(
+                    cluster_uuid=cluster_uuid,
+                    kdu_instance=kdu_instance,
+                    show_error_log=False
+                )
+                if result is not None:
+                    # instance already exists: generate a new one
+                    kdu_instance = None
+            except:
+                kdu_instance = None
+
+        # helm repo install
+        command = '{} install {} --output yaml --kubeconfig={} --home={} {} {} --name={} {} {}'\
+            .format(self._helm_command, atomic_str, config_filename, helm_dir,
+                    params_str, timeout_str, kdu_instance, kdu_model, version_str)
+        self.debug('installing: {}'.format(command))
+
+        if atomic:
+            # exec helm in a task
+            exec_task = asyncio.ensure_future(
+                coro_or_future=self._local_async_exec(command=command, raise_exception_on_error=False)
+            )
+            # write status in another task
+            status_task = asyncio.ensure_future(
+                coro_or_future=self._store_status(
+                    cluster_uuid=cluster_uuid,
+                    kdu_instance=kdu_instance,
+                    db_dict=db_dict,
+                    operation='install',
+                    run_once=False
+                )
+            )
+
+            # wait for execution task
+            await asyncio.wait([exec_task])
+
+            # cancel status task
+            status_task.cancel()
+
+            output, rc = exec_task.result()
+
+        else:
+
+            output, rc = await self._local_async_exec(command=command, raise_exception_on_error=False)
+
+        # write final status
+        await self._store_status(
+            cluster_uuid=cluster_uuid,
+            kdu_instance=kdu_instance,
+            db_dict=db_dict,
+            operation='install',
+            run_once=True,
+            check_every=0
+        )
+
+        if rc != 0:
+            msg = 'Error executing command: {}\nOutput: {}'.format(command, output)
+            self.error(msg)
+            raise Exception(msg)
+
+        self.debug('Returning kdu_instance {}'.format(kdu_instance))
+        return kdu_instance
+
+    async def instances_list(
+            self,
+            cluster_uuid: str
+    ) -> list:
+        """
+        returns a list of deployed releases in a cluster
+
+        :param cluster_uuid: the cluster
+        :return:
+        """
+
+        self.debug('list releases for cluster {}'.format(cluster_uuid))
+
+        # config filename
+        kube_dir, helm_dir, config_filename = self._get_paths(cluster_name=cluster_uuid, create_if_not_exist=True)
+
+        command = '{} --kubeconfig={} --home={} list --output yaml'\
+            .format(self._helm_command, config_filename, helm_dir)
+
+        output, rc = await self._local_async_exec(command=command, raise_exception_on_error=True)
+
+        if output and len(output) > 0:
+            return yaml.load(output, Loader=yaml.SafeLoader).get('Releases')
+        else:
+            return []
+
+    async def upgrade(
+            self,
+            cluster_uuid: str,
+            kdu_instance: str,
+            kdu_model: str = None,
+            atomic: bool = True,
+            timeout: float = 300,
+            params: dict = None,
+            db_dict: dict = None
+    ):
+
+        self.debug('upgrading {} in cluster {}'.format(kdu_model, cluster_uuid))
+
+        start = time.time()
+        end = start + timeout
+
+        # config filename
+        kube_dir, helm_dir, config_filename = self._get_paths(cluster_name=cluster_uuid, create_if_not_exist=True)
+
+        # params to str
+        params_str = K8sHelmConnector._params_to_set_option(params)
+
+        timeout_str = ''
+        if timeout:
+            timeout_str = '--timeout {}'.format(timeout)
+
+        # atomic
+        atomic_str = ''
+        if atomic:
+            atomic_str = '--atomic'
+
+        # version
+        version_str = ''
+        if ':' in kdu_model:
+            parts = kdu_model.split(sep=':')
+            if len(parts) == 2:
+                version_str = '--version {}'.format(parts[1])
+                kdu_model = parts[0]
+
+        # helm repo upgrade
+        command = '{} upgrade {} --output yaml --kubeconfig={} --home={} {} {} {} {} {}'\
+            .format(self._helm_command, atomic_str, config_filename, helm_dir,
+                    params_str, timeout_str, kdu_instance, kdu_model, version_str)
+        self.debug('upgrading: {}'.format(command))
+
+        if atomic:
+
+            # exec helm in a task
+            exec_task = asyncio.ensure_future(
+                coro_or_future=self._local_async_exec(command=command, raise_exception_on_error=False)
+            )
+            # write status in another task
+            status_task = asyncio.ensure_future(
+                coro_or_future=self._store_status(
+                    cluster_uuid=cluster_uuid,
+                    kdu_instance=kdu_instance,
+                    db_dict=db_dict,
+                    operation='upgrade',
+                    run_once=False
+                )
+            )
+
+            # wait for execution task
+            await asyncio.wait([ exec_task ])
+
+            # cancel status task
+            status_task.cancel()
+            output, rc = exec_task.result()
+
+        else:
+
+            output, rc = await self._local_async_exec(command=command, raise_exception_on_error=False)
+
+        # write final status
+        await self._store_status(
+            cluster_uuid=cluster_uuid,
+            kdu_instance=kdu_instance,
+            db_dict=db_dict,
+            operation='upgrade',
+            run_once=True,
+            check_every=0
+        )
+
+        if rc != 0:
+            msg = 'Error executing command: {}\nOutput: {}'.format(command, output)
+            self.error(msg)
+            raise Exception(msg)
+
+        # return new revision number
+        instance = await self.get_instance_info(cluster_uuid=cluster_uuid, kdu_instance=kdu_instance)
+        if instance:
+            revision = int(instance.get('Revision'))
+            self.debug('New revision: {}'.format(revision))
+            return revision
+        else:
+            return 0
+
+    async def rollback(
+            self,
+            cluster_uuid: str,
+            kdu_instance: str,
+            revision=0,
+            db_dict: dict = None
+    ):
+
+        self.debug('rollback kdu_instance {} to revision {} from cluster {}'
+                   .format(kdu_instance, revision, cluster_uuid))
+
+        # config filename
+        kube_dir, helm_dir, config_filename = self._get_paths(cluster_name=cluster_uuid, create_if_not_exist=True)
+
+        command = '{} rollback --kubeconfig={} --home={} {} {} --wait'\
+            .format(self._helm_command, config_filename, helm_dir, kdu_instance, revision)
+
+        # exec helm in a task
+        exec_task = asyncio.ensure_future(
+            coro_or_future=self._local_async_exec(command=command, raise_exception_on_error=False)
+        )
+        # write status in another task
+        status_task = asyncio.ensure_future(
+            coro_or_future=self._store_status(
+                cluster_uuid=cluster_uuid,
+                kdu_instance=kdu_instance,
+                db_dict=db_dict,
+                operation='rollback',
+                run_once=False
+            )
+        )
+
+        # wait for execution task
+        await asyncio.wait([exec_task])
+
+        # cancel status task
+        status_task.cancel()
+
+        output, rc = exec_task.result()
+
+        # write final status
+        await self._store_status(
+            cluster_uuid=cluster_uuid,
+            kdu_instance=kdu_instance,
+            db_dict=db_dict,
+            operation='rollback',
+            run_once=True,
+            check_every=0
+        )
+
+        if rc != 0:
+            msg = 'Error executing command: {}\nOutput: {}'.format(command, output)
+            self.error(msg)
+            raise Exception(msg)
+
+        # return new revision number
+        instance = await self.get_instance_info(cluster_uuid=cluster_uuid, kdu_instance=kdu_instance)
+        if instance:
+            revision = int(instance.get('Revision'))
+            self.debug('New revision: {}'.format(revision))
+            return revision
+        else:
+            return 0
+
+    async def uninstall(
+            self,
+            cluster_uuid: str,
+            kdu_instance: str
+    ):
+        """
+        Removes an existing KDU instance. It would implicitly use the `delete` call (this call would happen
+        after all _terminate-config-primitive_ of the VNF are invoked).
+
+        :param cluster_uuid: UUID of a K8s cluster known by OSM
+        :param kdu_instance: unique name for the KDU instance to be deleted
+        :return: True if successful
+        """
+
+        self.debug('uninstall kdu_instance {} from cluster {}'.format(kdu_instance, cluster_uuid))
+
+        # config filename
+        kube_dir, helm_dir, config_filename = self._get_paths(cluster_name=cluster_uuid, create_if_not_exist=True)
+
+        command = '{} --kubeconfig={} --home={} delete --purge {}'\
+            .format(self._helm_command, config_filename, helm_dir, kdu_instance)
+
+        output, rc = await self._local_async_exec(command=command, raise_exception_on_error=True)
+
+        return self._output_to_table(output)
+
+    async def inspect_kdu(
+            self,
+            kdu_model: str
+    ) -> str:
+
+        self.debug('inspect kdu_model {}'.format(kdu_model))
+
+        command = '{} inspect values {}'\
+            .format(self._helm_command, kdu_model)
+
+        output, rc = await self._local_async_exec(command=command)
+
+        return output
+
+    async def help_kdu(
+            self,
+            kdu_model: str
+    ):
+
+        self.debug('help kdu_model {}'.format(kdu_model))
+
+        command = '{} inspect readme {}'\
+            .format(self._helm_command, kdu_model)
+
+        output, rc = await self._local_async_exec(command=command, raise_exception_on_error=True)
+
+        return output
+
+    async def status_kdu(
+            self,
+            cluster_uuid: str,
+            kdu_instance: str
+    ):
+
+        return await self._status_kdu(cluster_uuid=cluster_uuid, kdu_instance=kdu_instance, show_error_log=True)
+
+
+    """
+    ##################################################################################################
+    ########################################## P R I V A T E #########################################
+    ##################################################################################################
+    """
+
+    async def _status_kdu(
+            self,
+            cluster_uuid: str,
+            kdu_instance: str,
+            show_error_log: bool = False
+    ):
+
+        self.debug('status of kdu_instance {}'.format(kdu_instance))
+
+        # config filename
+        kube_dir, helm_dir, config_filename = self._get_paths(cluster_name=cluster_uuid, create_if_not_exist=True)
+
+        command = '{} --kubeconfig={} --home={} status {} --output yaml'\
+            .format(self._helm_command, config_filename, helm_dir, kdu_instance)
+
+        output, rc = await self._local_async_exec(
+            command=command,
+            raise_exception_on_error=True,
+            show_error_log=show_error_log
+        )
+
+        if rc != 0:
+            return None
+
+        data = yaml.load(output, Loader=yaml.SafeLoader)
+
+        # remove field 'notes'
+        try:
+            del data.get('info').get('status')['notes']
+        except KeyError:
+            pass
+
+        # parse field 'resources'
+        try:
+            resources = str(data.get('info').get('status').get('resources'))
+            resource_table = self._output_to_table(resources)
+            data.get('info').get('status')['resources'] = resource_table
+        except Exception as e:
+            pass
+
+        return data
+
+
+    async def get_instance_info(
+            self,
+            cluster_uuid: str,
+            kdu_instance: str
+    ):
+        instances = await self.instances_list(cluster_uuid=cluster_uuid)
+        for instance in instances:
+            if instance.get('Name') == kdu_instance:
+                return instance
+        self.debug('Instance {} not found'.format(kdu_instance))
+        return None
+
+    @staticmethod
+    def _generate_release_name(
+            chart_name: str
+    ):
+        name = ''
+        for c in chart_name:
+            if c.isalpha() or c.isnumeric():
+                name += c
+            else:
+                name += '-'
+        if len(name) > 35:
+            name = name[0:35]
+
+        # if does not start with alpha character, prefix 'a'
+        if not name[0].isalpha():
+            name = 'a' + name
+
+        name += '-'
+
+        def get_random_number():
+            r = random.randrange(start=1, stop=99999999)
+            s = str(r)
+            while len(s) < 10:
+                s = '0' + s
+            return s
+
+        name = name + get_random_number()
+        return name.lower()
+
+    async def _store_status(
+            self,
+            cluster_uuid: str,
+            operation: str,
+            kdu_instance: str,
+            check_every: float = 10,
+            db_dict: dict = None,
+            run_once: bool = False
+    ):
+        while True:
+            try:
+                await asyncio.sleep(check_every)
+                detailed_status = await self.status_kdu(cluster_uuid=cluster_uuid, kdu_instance=kdu_instance)
+                status = detailed_status.get('info').get('Description')
+                print('=' * 60)
+                self.debug('STATUS:\n{}'.format(status))
+                self.debug('DETAILED STATUS:\n{}'.format(detailed_status))
+                print('=' * 60)
+                # write status to db
+                result = await self.write_app_status_to_db(
+                    db_dict=db_dict,
+                    status=str(status),
+                    detailed_status=str(detailed_status),
+                    operation=operation)
+                if not result:
+                    self.info('Error writing in database. Task exiting...')
+                    return
+            except asyncio.CancelledError:
+                self.debug('Task cancelled')
+                return
+            except Exception as e:
+                pass
+            finally:
+                if run_once:
+                    return
+
+    async def _is_install_completed(
+            self,
+            cluster_uuid: str,
+            kdu_instance: str
+    ) -> bool:
+
+        status = await self.status_kdu(cluster_uuid=cluster_uuid, kdu_instance=kdu_instance)
+
+        # extract info.status.resources-> str
+        # format:
+        #       ==> v1/Deployment
+        #       NAME                    READY   UP-TO-DATE   AVAILABLE   AGE
+        #       halting-horse-mongodb   0/1     1            0           0s
+        #       halting-petit-mongodb   1/1     1            0           0s
+        # blank line
+        resources = K8sHelmConnector._get_deep(status, ('info', 'status', 'resources'))
+
+        # convert to table
+        resources = K8sHelmConnector._output_to_table(resources)
+
+        num_lines = len(resources)
+        index = 0
+        while index < num_lines:
+            try:
+                line1 = resources[index]
+                index += 1
+                # find '==>' in column 0
+                if line1[0] == '==>':
+                    line2 = resources[index]
+                    index += 1
+                    # find READY in column 1
+                    if line2[1] == 'READY':
+                        # read next lines
+                        line3 = resources[index]
+                        index += 1
+                        while len(line3) > 1 and index < num_lines:
+                            ready_value = line3[1]
+                            parts = ready_value.split(sep='/')
+                            current = int(parts[0])
+                            total = int(parts[1])
+                            if current < total:
+                                self.debug('NOT READY:\n    {}'.format(line3))
+                                ready = False
+                            line3 = resources[index]
+                            index += 1
+
+            except Exception as e:
+                pass
+
+        return ready
+
+    @staticmethod
+    def _get_deep(dictionary: dict, members: tuple):
+        target = dictionary
+        value = None
+        try:
+            for m in members:
+                value = target.get(m)
+                if not value:
+                    return None
+                else:
+                    target = value
+        except Exception as e:
+            pass
+        return value
+
+    # find key:value in several lines
+    @staticmethod
+    def _find_in_lines(p_lines: list, p_key: str) -> str:
+        for line in p_lines:
+            try:
+                if line.startswith(p_key + ':'):
+                    parts = line.split(':')
+                    the_value = parts[1].strip()
+                    return the_value
+            except Exception as e:
+                # ignore it
+                pass
+        return None
+
+    # params for use in --set option
+    @staticmethod
+    def _params_to_set_option(params: dict) -> str:
+        params_str = ''
+        if params and len(params) > 0:
+            start = True
+            for key in params:
+                value = params.get(key, None)
+                if value is not None:
+                    if start:
+                        params_str += '--set '
+                        start = False
+                    else:
+                        params_str += ','
+                    params_str += '{}={}'.format(key, value)
+        return params_str
+
+    @staticmethod
+    def _output_to_lines(output: str) -> list:
+        output_lines = list()
+        lines = output.splitlines(keepends=False)
+        for line in lines:
+            line = line.strip()
+            if len(line) > 0:
+                output_lines.append(line)
+        return output_lines
+
+    @staticmethod
+    def _output_to_table(output: str) -> list:
+        output_table = list()
+        lines = output.splitlines(keepends=False)
+        for line in lines:
+            line = line.replace('\t', ' ')
+            line_list = list()
+            output_table.append(line_list)
+            cells = line.split(sep=' ')
+            for cell in cells:
+                cell = cell.strip()
+                if len(cell) > 0:
+                    line_list.append(cell)
+        return output_table
+
+    def _get_paths(self, cluster_name: str, create_if_not_exist: bool = False) -> (str, str, str):
+        """
+        Returns kube and helm directories
+
+        :param cluster_name:
+        :param create_if_not_exist:
+        :return: kube, helm directories and config filename. Raises exception if not exist and cannot create
+        """
+
+        base = self.fs.path
+        if base.endswith("/") or base.endswith("\\"):
+            base = base[:-1]
+
+        # base dir for cluster
+        cluster_dir = base + '/' + cluster_name
+        if create_if_not_exist and not os.path.exists(cluster_dir):
+            self.debug('Creating dir {}'.format(cluster_dir))
+            os.makedirs(cluster_dir)
+        if not os.path.exists(cluster_dir):
+            msg = 'Base cluster dir {} does not exist'.format(cluster_dir)
+            self.error(msg)
+            raise Exception(msg)
+
+        # kube dir
+        kube_dir = cluster_dir + '/' + '.kube'
+        if create_if_not_exist and not os.path.exists(kube_dir):
+            self.debug('Creating dir {}'.format(kube_dir))
+            os.makedirs(kube_dir)
+        if not os.path.exists(kube_dir):
+            msg = 'Kube config dir {} does not exist'.format(kube_dir)
+            self.error(msg)
+            raise Exception(msg)
+
+        # helm home dir
+        helm_dir = cluster_dir + '/' + '.helm'
+        if create_if_not_exist and not os.path.exists(helm_dir):
+            self.debug('Creating dir {}'.format(helm_dir))
+            os.makedirs(helm_dir)
+        if not os.path.exists(helm_dir):
+            msg = 'Helm config dir {} does not exist'.format(helm_dir)
+            self.error(msg)
+            raise Exception(msg)
+
+        config_filename = kube_dir + '/config'
+        return kube_dir, helm_dir, config_filename
+
+    @staticmethod
+    def _remove_multiple_spaces(str):
+        str = str.strip()
+        while '  ' in str:
+            str = str.replace('  ', ' ')
+        return str
+
+    def _local_exec(
+            self,
+            command: str
+    ) -> (str, int):
+        command = K8sHelmConnector._remove_multiple_spaces(command)
+        self.debug('Executing sync local command: {}'.format(command))
+        # raise exception if fails
+        output = ''
+        try:
+            output = subprocess.check_output(command, shell=True, universal_newlines=True)
+            return_code = 0
+            self.debug(output)
+        except Exception as e:
+            return_code = 1
+
+        return output, return_code
+
+    async def _local_async_exec(
+            self,
+            command: str,
+            raise_exception_on_error: bool = False,
+            show_error_log: bool = False
+    ) -> (str, int):
+
+        command = K8sHelmConnector._remove_multiple_spaces(command)
+        self.debug('Executing async local command: {}'.format(command))
+
+        # split command
+        command = command.split(sep=' ')
+
+        try:
+            process = await asyncio.create_subprocess_exec(
+                *command,
+                stdout=asyncio.subprocess.PIPE,
+                stderr=asyncio.subprocess.PIPE
+            )
+
+            # wait for command terminate
+            stdout, stderr = await process.communicate()
+
+            return_code = process.returncode
+
+            output = ''
+            if stdout:
+                output = stdout.decode('utf-8').strip()
+            if stderr:
+                output = stderr.decode('utf-8').strip()
+
+            if return_code != 0 and show_error_log:
+                self.debug('Return code (FAIL): {}\nOutput:\n{}'.format(return_code, output))
+            else:
+                self.debug('Return code: {}'.format(return_code))
+
+            if raise_exception_on_error and return_code != 0:
+                raise Exception(output)
+
+            return output, return_code
+
+        except Exception as e:
+            msg = 'Exception executing command: {} -> {}'.format(command, e)
+            if show_error_log:
+                self.error(msg)
+            return '', -1
+
+    def _remote_exec(
+            self,
+            hostname: str,
+            username: str,
+            password: str,
+            command: str,
+            timeout: int = 10
+    ) -> (str, int):
+
+        command = K8sHelmConnector._remove_multiple_spaces(command)
+        self.debug('Executing sync remote ssh command: {}'.format(command))
+
+        ssh = paramiko.SSHClient()
+        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
+        ssh.connect(hostname=hostname, username=username, password=password)
+        ssh_stdin, ssh_stdout, ssh_stderr = ssh.exec_command(command=command, timeout=timeout)
+        output = ssh_stdout.read().decode('utf-8')
+        error = ssh_stderr.read().decode('utf-8')
+        if error:
+            self.error('ERROR: {}'.format(error))
+            return_code = 1
+        else:
+            return_code = 0
+        output = output.replace('\\n', '\n')
+        self.debug('OUTPUT: {}'.format(output))
+
+        return output, return_code
+
+    def _check_file_exists(self, filename: str, exception_if_not_exists: bool = False):
+        self.debug('Checking if file {} exists...'.format(filename))
+        if os.path.exists(filename):
+            return True
+        else:
+            msg = 'File {} does not exist'.format(filename)
+            if exception_if_not_exists:
+                self.error(msg)
+                raise Exception(msg)
+
diff --git a/n2vc/loggable.py b/n2vc/loggable.py
new file mode 100644
index 0000000..40efa24
--- /dev/null
+++ b/n2vc/loggable.py
@@ -0,0 +1,167 @@
+##
+# Copyright 2019 Telefonica Investigacion y Desarrollo, S.A.U.
+# This file is part of OSM
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact with: nfvlabs@tid.es
+##
+
+
+import logging
+import asyncio
+import time
+import inspect
+import datetime
+import threading    # only for logging purposes (not for using threads)
+
+
+class Loggable:
+
+    def __init__(
+            self,
+            log,
+            log_to_console: bool = False,
+            prefix: str = ''
+    ):
+
+        self._last_log_time = None   # used for time increment in logging
+        self._log_to_console = log_to_console
+        self._prefix = prefix
+        if log is not None:
+            self.log = log
+        else:
+            self.log = logging.getLogger(__name__)
+
+    def debug(self, msg: str):
+        self._log_msg(log_level='DEBUG', msg=msg)
+
+    def info(self, msg: str):
+        self._log_msg(log_level='INFO', msg=msg)
+
+    def warning(self, msg: str):
+        self._log_msg(log_level='WARNING', msg=msg)
+
+    def error(self, msg: str):
+        self._log_msg(log_level='ERROR', msg=msg)
+
+    def critical(self, msg: str):
+        self._log_msg(log_level='CRITICAL', msg=msg)
+
+    ##################################################################################################
+
+    def _log_msg(self, log_level: str, msg: str):
+        """Generic log method"""
+        msg = self._format_log(
+            log_level=log_level,
+            msg=msg,
+            obj=self,
+            level=3,
+            include_path=False,
+            include_thread=False,
+            include_coroutine=True
+        )
+        if self._log_to_console:
+            print(msg)
+        else:
+            if self.log is not None:
+                if log_level == 'DEBUG':
+                    self.log.debug(msg)
+                elif log_level == 'INFO':
+                    self.log.info(msg)
+                elif log_level == 'WARNING':
+                    self.log.warning(msg)
+                elif log_level == 'ERROR':
+                    self.log.error(msg)
+                elif log_level == 'CRITICAL':
+                    self.log.critical(msg)
+
+    def _format_log(
+            self,
+            log_level: str,
+            msg: str = '',
+            obj: object = None,
+            level: int = None,
+            include_path: bool = False,
+            include_thread: bool = False,
+            include_coroutine: bool = True
+    ) -> str:
+
+        # time increment from last log
+        now = time.perf_counter()
+        if self._last_log_time is None:
+            time_str = ' (+0.000)'
+        else:
+            diff = round(now - self._last_log_time, 3)
+            time_str = ' (+{})'.format(diff)
+        self._last_log_time = now
+
+        if level is None:
+            level = 1
+
+        # stack info
+        fi = inspect.stack()[level]
+        filename = fi.filename
+        func = fi.function
+        lineno = fi.lineno
+        # filename without path
+        if not include_path:
+            i = filename.rfind('/')
+            if i > 0:
+                filename = filename[i+1:]
+
+        # datetime
+        dt = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f')
+        dt = dt + time_str
+        dt = time_str       # logger already shows datetime
+
+        # current thread
+        if include_thread:
+            thread_name = 'th:{}'.format(threading.current_thread().getName())
+        else:
+            thread_name = ''
+
+        # current coroutine
+
+        coroutine_id = ''
+        if include_coroutine:
+            try:
+                if asyncio.Task.current_task() is not None:
+                    def print_cor_name(c):
+                        import inspect
+                        try:
+                            for m in inspect.getmembers(c):
+                                if m[0] == '__name__':
+                                    return m[1]
+                        except Exception:
+                            pass
+                    coro = asyncio.Task.current_task()._coro
+                    coroutine_id = 'coro-{} {}()'.format(hex(id(coro))[2:], print_cor_name(coro))
+            except Exception:
+                coroutine_id = ''
+
+        # classname
+        if obj is not None:
+            obj_type = obj.__class__.__name__  # type: str
+            log_msg = \
+                '{} {} {} {} {}::{}.{}():{}\n{}'\
+                .format(self._prefix, dt, thread_name, coroutine_id, filename, obj_type, func, lineno, str(msg))
+        else:
+            log_msg = \
+                '{} {} {} {} {}::{}():{}\n{}'\
+                .format(self._prefix, dt, thread_name, coroutine_id, filename, func, lineno, str(msg))
+
+        return log_msg