X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=functest%2Fopnfv_tests%2Fvnf%2Fepc%2Fjuju_epc.py;h=1cf240b80810ce5ea90e97de0a3ba7b8a8632bd7;hb=4fdbdd34fb5fea55571a18b2438ececa953928ff;hp=9e5f8d33b39e9dfd2d242aa3193a7169d2a13c9b;hpb=2185f7ba88abae4c5b575a98cffd1fe9cfcfb42d;p=functest.git

diff --git a/functest/opnfv_tests/vnf/epc/juju_epc.py b/functest/opnfv_tests/vnf/epc/juju_epc.py
index 9e5f8d33b..1cf240b80 100644
--- a/functest/opnfv_tests/vnf/epc/juju_epc.py
+++ b/functest/opnfv_tests/vnf/epc/juju_epc.py
@@ -13,33 +13,17 @@ import logging
 import os
 import time
 import json
+import re
 import sys
-import uuid
+
 from copy import deepcopy
-from urlparse import urljoin
 import pkg_resources
-import yaml
+import scp
 
-from functest.core import vnf
-from functest.opnfv_tests.openstack.snaps import snaps_utils
+from functest.core import singlevm
 from functest.utils import config
 from functest.utils import env
-
-from snaps.config.flavor import FlavorConfig
-from snaps.config.image import ImageConfig
-from snaps.config.network import NetworkConfig, SubnetConfig
-from snaps.config.router import RouterConfig
-from snaps.config.security_group import (
-    Direction, Protocol, SecurityGroupConfig, SecurityGroupRuleConfig)
-from snaps.config.user import UserConfig
-from snaps.openstack.create_flavor import OpenStackFlavor
-from snaps.openstack.create_image import OpenStackImage
-from snaps.openstack.create_network import OpenStackNetwork
-from snaps.openstack.create_router import OpenStackRouter
-from snaps.openstack.create_security_group import OpenStackSecurityGroup
-from snaps.openstack.create_user import OpenStackUser
-from snaps.openstack.utils import keystone_utils
-from snaps.openstack.utils import nova_utils
+from functest.utils import functest_utils
 
 __author__ = "Amarendra Meher <amarendra@rebaca.com>"
 __author__ = "Soumaya K Nayek <soumaya.nayek@rebaca.com>"
@@ -58,180 +42,186 @@ CREDS_TEMPLATE2 = """credentials:
     default-credential: abot-epc
     abot-epc:
       auth-type: userpass
-      password: {pass}
+      password: '{pass}'
       project-domain-name: {project_domain_n}
       tenant-name: {tenant_n}"""
 
-CREDS_TEMPLATE3 = """credentials:
+CREDS_TEMPLATE = """credentials:
   abot-epc:
     default-credential: abot-epc
     abot-epc:
       auth-type: userpass
-      password: {pass}
+      password: '{pass}'
       project-domain-name: {project_domain_n}
       tenant-name: {tenant_n}
       user-domain-name: {user_domain_n}
       username: {user_n}"""
 
 
-class JujuEpc(vnf.VnfOnBoarding):
+class JujuEpc(singlevm.SingleVm2):
     # pylint:disable=too-many-instance-attributes
     """Abot EPC deployed with JUJU Orchestrator Case"""
 
     __logger = logging.getLogger(__name__)
 
+    cidr = '192.168.120.0/24'
+
+    filename = ('/home/opnfv/functest/images/'
+                'ubuntu-16.04-server-cloudimg-amd64-disk1.img')
+    filename_alt = ('/home/opnfv/functest/images/'
+                    'ubuntu-14.04-server-cloudimg-amd64-disk1.img')
+
+    flavor_ram = 2048
+    flavor_vcpus = 1
+    flavor_disk = 10
+    flavor_alt_ram = 4096
+    flavor_alt_vcpus = 1
+    flavor_alt_disk = 10
+    username = 'ubuntu'
+    juju_timeout = '4800'
+
     def __init__(self, **kwargs):
         if "case_name" not in kwargs:
             kwargs["case_name"] = "juju_epc"
-        super(JujuEpc, self).__init__(**kwargs)
+        super().__init__(**kwargs)
 
         # Retrieve the configuration
         self.case_dir = pkg_resources.resource_filename(
             'functest', 'opnfv_tests/vnf/epc')
         try:
             self.config = getattr(
-                config.CONF, 'vnf_{}_config'.format(self.case_name))
-        except Exception:
-            raise Exception("VNF config file not found")
+                config.CONF, f'vnf_{self.case_name}_config')
+        except Exception as exc:
+            raise Exception("VNF config file not found") from exc
         self.config_file = os.path.join(self.case_dir, self.config)
-        self.orchestrator = dict(requirements=get_config(
-            "orchestrator.requirements", self.config_file))
+        self.orchestrator = dict(
+            requirements=functest_utils.get_parameter_from_yaml(
+                "orchestrator.requirements", self.config_file))
 
         self.created_object = []
         self.details['orchestrator'] = dict(
-            name=get_config("orchestrator.name", self.config_file),
-            version=get_config("orchestrator.version", self.config_file),
+            name=functest_utils.get_parameter_from_yaml(
+                "orchestrator.name", self.config_file),
+            version=functest_utils.get_parameter_from_yaml(
+                "orchestrator.version", self.config_file),
             status='ERROR',
             result=''
         )
 
         self.vnf = dict(
-            descriptor=get_config("vnf.descriptor", self.config_file),
-            requirements=get_config("vnf.requirements", self.config_file)
+            descriptor=functest_utils.get_parameter_from_yaml(
+                "vnf.descriptor", self.config_file),
+            requirements=functest_utils.get_parameter_from_yaml(
+                "vnf.requirements", self.config_file)
         )
         self.details['vnf'] = dict(
             descriptor_version=self.vnf['descriptor']['version'],
-            name=get_config("vnf.name", self.config_file),
-            version=get_config("vnf.version", self.config_file),
+            name=functest_utils.get_parameter_from_yaml(
+                "vnf.name", self.config_file),
+            version=functest_utils.get_parameter_from_yaml(
+                "vnf.version", self.config_file),
         )
         self.__logger.debug("VNF configuration: %s", self.vnf)
 
         self.details['test_vnf'] = dict(
-            name=get_config("vnf_test_suite.name", self.config_file),
-            version=get_config("vnf_test_suite.version", self.config_file),
-            tag_name=get_config("vnf_test_suite.tag_name", self.config_file)
+            name=functest_utils.get_parameter_from_yaml(
+                "vnf_test_suite.name", self.config_file),
+            version=functest_utils.get_parameter_from_yaml(
+                "vnf_test_suite.version", self.config_file),
+            tag_name=functest_utils.get_parameter_from_yaml(
+                "vnf_test_suite.tag_name", self.config_file)
         )
-        self.public_auth_url = None
 
         self.res_dir = os.path.join(
             getattr(config.CONF, 'dir_results'), self.case_name)
 
-    def _bypass_juju_network_discovery_bug(self, name):
-        user_creator = OpenStackUser(
-            self.snaps_creds,
-            UserConfig(
-                name=name,
-                password=str(uuid.uuid4()),
-                project_name=self.tenant_name,
-                domain=self.snaps_creds.user_domain_name,
-                roles={'_member_': self.tenant_name}))
-        user_creator.create()
-        self.created_object.append(user_creator)
-        return user_creator
+        try:
+            self.public_auth_url = self.get_public_auth_url(self.orig_cloud)
+            if not self.public_auth_url.endswith(('v3', 'v3/')):
+                self.public_auth_url = f"{self.public_auth_url}/v3"
+        except Exception:  # pylint: disable=broad-except
+            self.public_auth_url = None
+        self.sec = None
+        self.image_alt = None
+        self.flavor_alt = None
+
+    def _install_juju(self):
+        (_, stdout, stderr) = self.ssh.exec_command(
+            'sudo snap install juju --channel=2.3/stable --classic')
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        return not stdout.channel.recv_exit_status()
+
+    def _install_juju_wait(self):
+        (_, stdout, stderr) = self.ssh.exec_command(
+            'sudo apt-get update && sudo apt-get install python3-pip -y && '
+            'sudo pip3 install juju_wait===2.6.4')
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        return not stdout.channel.recv_exit_status()
 
     def _register_cloud(self):
+        assert self.public_auth_url
         self.__logger.info("Creating Cloud for Abot-epc .....")
         clouds_yaml = os.path.join(self.res_dir, "clouds.yaml")
-        # It allows gating APEX and ensures this testcase is working till
-        # https://jira.opnfv.org/browse/APEX-570 is fixed in APEX.
-        # It must be removed as soon as possible to disable per installer
-        # processing in Functest.
-        region = self.snaps_creds.region_name
-        if not region and env.get('INSTALLER_TYPE') == 'apex':
-            region = "regionOne"
         cloud_data = {
             'url': self.public_auth_url,
-            'region': region}
-        with open(clouds_yaml, 'w') as yfile:
+            'region': self.cloud.region_name if self.cloud.region_name else (
+                'RegionOne')}
+        with open(clouds_yaml, 'w', encoding='utf-8') as yfile:
             yfile.write(CLOUD_TEMPLATE.format(**cloud_data))
-        if os.system(
-                'juju add-cloud abot-epc -f {} --replace'.format(clouds_yaml)):
-            raise vnf.VnfPreparationException
-
-    def _register_credentials_v2(self):
-        self.__logger.info("Creating Credentials for Abot-epc .....")
-        user_creator = self._bypass_juju_network_discovery_bug(
-            'juju_network_discovery_bug')
-        snaps_creds = user_creator.get_os_creds(self.snaps_creds.project_name)
-        self.__logger.debug("snaps creds: %s", snaps_creds)
-        credentials_yaml = os.path.join(self.res_dir, "credentials.yaml")
-        creds_data = {
-            'pass': snaps_creds.password,
-            'tenant_n': snaps_creds.project_name,
-            'user_n': snaps_creds.username}
-        with open(credentials_yaml, 'w') as yfile:
-            yfile.write(CREDS_TEMPLATE2.format(**creds_data))
-        if os.system(
-                'juju add-credential abot-epc -f {} --replace'.format(
-                    credentials_yaml)):
-            raise vnf.VnfPreparationException
-
-    def _register_credentials_v3(self):
+        scpc = scp.SCPClient(self.ssh.get_transport())
+        scpc.put(clouds_yaml, remote_path='~/')
+        (_, stdout, stderr) = self.ssh.exec_command(
+            '/snap/bin/juju add-cloud abot-epc -f clouds.yaml --replace')
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        return not stdout.channel.recv_exit_status()
+
+    def _register_credentials(self):
         self.__logger.info("Creating Credentials for Abot-epc .....")
-        user_creator = self._bypass_juju_network_discovery_bug(
-            'juju_network_discovery_bug')
-        snaps_creds = user_creator.get_os_creds(self.snaps_creds.project_name)
-        self.__logger.debug("snaps creds: %s", snaps_creds)
         credentials_yaml = os.path.join(self.res_dir, "credentials.yaml")
         creds_data = {
-            'pass': snaps_creds.password,
-            'tenant_n': snaps_creds.project_name,
-            'user_n': snaps_creds.username,
-            'project_domain_n': snaps_creds.project_domain_name,
-            'user_domain_n': snaps_creds.user_domain_name}
-        with open(credentials_yaml, 'w') as yfile:
-            yfile.write(CREDS_TEMPLATE3.format(**creds_data))
-        if os.system(
-                'juju add-credential abot-epc -f {} --replace'.format(
-                    credentials_yaml)):
-            raise vnf.VnfPreparationException
-
-    def _add_custom_rule(self, sec_grp_name):
-        """ To add custom rule for SCTP Traffic """
-        sec_grp_rules = list()
-        sec_grp_rules.append(
-            SecurityGroupRuleConfig(
-                sec_grp_name=sec_grp_name, direction=Direction.ingress,
-                protocol=Protocol.sctp))
-        security_group = OpenStackSecurityGroup(
-            self.snaps_creds,
-            SecurityGroupConfig(
-                name=sec_grp_name,
-                rule_settings=sec_grp_rules))
-        security_group.create()
-        self.created_object.append(security_group)
-
-    def prepare(self):
-        """Prepare testcase (Additional pre-configuration steps)."""
-        self.__logger.info("Additional pre-configuration steps")
-        super(JujuEpc, self).prepare()
-        try:
-            os.makedirs(self.res_dir)
-        except OSError as ex:
-            if ex.errno != errno.EEXIST:
-                self.__logger.exception("Cannot create %s", self.res_dir)
-                raise vnf.VnfPreparationException
-        self.public_auth_url = keystone_utils.get_endpoint(
-            self.snaps_creds, 'identity')
-        # it enforces a versioned public identity endpoint as juju simply
-        # adds /auth/tokens wich fails vs an unversioned endpoint.
-        if not self.public_auth_url.endswith(('v3', 'v3/', 'v2.0', 'v2.0/')):
-            self.public_auth_url = urljoin(self.public_auth_url, 'v3')
-        self._register_cloud()
-        if self.snaps_creds.identity_api_version == 3:
-            self._register_credentials_v3()
-        else:
-            self._register_credentials_v2()
+            'pass': self.project.password,
+            'tenant_n': self.project.project.name,
+            'user_n': self.project.user.name,
+            'project_domain_n': self.cloud.auth.get(
+                "project_domain_name", "Default"),
+            'user_domain_n': self.cloud.auth.get(
+                "user_domain_name", "Default")}
+        with open(credentials_yaml, 'w', encoding='utf-8') as yfile:
+            yfile.write(CREDS_TEMPLATE.format(**creds_data))
+        scpc = scp.SCPClient(self.ssh.get_transport())
+        scpc.put(credentials_yaml, remote_path='~/')
+        (_, stdout, stderr) = self.ssh.exec_command(
+            '/snap/bin/juju add-credential abot-epc -f credentials.yaml '
+            ' --replace --debug')
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        return not stdout.channel.recv_exit_status()
+
+    def _publish_image(self):
+        region_name = self.cloud.region_name if self.cloud.region_name else (
+            'RegionOne')
+        (_, stdout, stderr) = self.ssh.exec_command(
+            '/snap/bin/juju metadata generate-image -d /home/ubuntu '
+            f'-i {self.image.id} -s xenial -r {region_name} '
+            f'-u {self.public_auth_url}')
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        return not stdout.channel.recv_exit_status()
+
+    def publish_image_alt(self, name=None):
+        image_alt = super().publish_image_alt(name)
+        region_name = self.cloud.region_name if self.cloud.region_name else (
+            'RegionOne')
+        (_, stdout, stderr) = self.ssh.exec_command(
+            '/snap/bin/juju metadata generate-image -d /home/ubuntu '
+            f'-i {image_alt.id} -s trusty -r {region_name} '
+            f'-u {self.public_auth_url}')
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        return image_alt
 
     def deploy_orchestrator(self):  # pylint: disable=too-many-locals
         """
@@ -239,204 +229,181 @@ class JujuEpc(vnf.VnfOnBoarding):
 
         Bootstrap juju
         """
-        self.__logger.info("Deployed Orchestrator")
-        private_net_name = getattr(
-            config.CONF, 'vnf_{}_private_net_name'.format(self.case_name))
-        private_subnet_name = '{}-{}'.format(
-            getattr(config.CONF,
-                    'vnf_{}_private_subnet_name'.format(self.case_name)),
-            self.uuid)
-        private_subnet_cidr = getattr(
-            config.CONF, 'vnf_{}_private_subnet_cidr'.format(self.case_name))
-        abot_router = '{}-{}'.format(
-            getattr(config.CONF,
-                    'vnf_{}_external_router'.format(self.case_name)),
-            self.uuid)
-        self.__logger.info("Creating full network ...")
-        subnet_settings = SubnetConfig(
-            name=private_subnet_name, cidr=private_subnet_cidr)
-        network_settings = NetworkConfig(
-            name=private_net_name, subnet_settings=[subnet_settings])
-        network_creator = OpenStackNetwork(self.snaps_creds, network_settings)
-        net_id = network_creator.create().id
-        self.created_object.append(network_creator)
-
-        ext_net_name = snaps_utils.get_ext_net_name(self.snaps_creds)
-        self.__logger.info("Creating network Router ....")
-        router_creator = OpenStackRouter(
-            self.snaps_creds, RouterConfig(
-                name=abot_router,
-                external_gateway=ext_net_name,
-                internal_subnets=[subnet_settings.name]))
-        router_creator.create()
-        self.created_object.append(router_creator)
-        self.__logger.info("Creating Flavor ....")
-        flavor_settings = FlavorConfig(
-            name=self.orchestrator['requirements']['flavor']['name'],
-            ram=self.orchestrator['requirements']['flavor']['ram_min'],
-            disk=10, vcpus=1)
-        flavor_creator = OpenStackFlavor(self.snaps_creds, flavor_settings)
-        flavor_creator.create()
-        self.created_object.append(flavor_creator)
-        self.__logger.info("Upload some OS images if it doesn't exist")
-        images = get_config("tenant_images", self.config_file)
-        self.__logger.info("Images needed for vEPC: %s", images)
-        for image_name, image_file in images.iteritems():
-            self.__logger.info("image: %s, file: %s", image_name, image_file)
-            if image_file and image_name:
-                image_creator = OpenStackImage(self.snaps_creds, ImageConfig(
-                    name=image_name, image_user='cloud', img_format='qcow2',
-                    image_file=image_file))
-                image_id = image_creator.create().id
-                # It allows gating APEX and ensures this testcase is working
-                # till https://jira.opnfv.org/browse/APEX-570 is fixed in APEX.
-                # It must be removed as soon as possible to disable per
-                # installer processing in Functest.
-                region = self.snaps_creds.region_name
-                if not region and env.get('INSTALLER_TYPE') == 'apex':
-                    region = "regionOne"
-                os.system(
-                    'juju metadata generate-image -d ~ -i {} -s {} -r '
-                    '{} -u {}'.format(
-                        image_id, image_name, region,
-                        self.public_auth_url))
-                self.created_object.append(image_creator)
-        self.__logger.info("Network ID  : %s", net_id)
-        juju_bootstrap_command = (
-            'juju bootstrap abot-epc abot-controller --config network={} '
-            '--metadata-source ~  --config ssl-hostname-verification=false '
+        self._publish_image()
+        self.image_alt = self.publish_image_alt()
+        self.flavor_alt = self.create_flavor_alt()
+        self.__logger.info("Starting Juju Bootstrap process...")
+        region_name = self.cloud.region_name if self.cloud.region_name else (
+            'RegionOne')
+        (_, stdout, stderr) = self.ssh.exec_command(
+            f'timeout {JujuEpc.juju_timeout} '
+            f'/snap/bin/juju bootstrap abot-epc/{region_name} abot-controller '
+            '--agent-version 2.3.9 --metadata-source /home/ubuntu '
             '--constraints mem=2G --bootstrap-series xenial '
-            '--config use-floating-ip=true --debug '
-            '--config use-default-secgroup=true'.format(net_id))
-        os.system(juju_bootstrap_command)
+            f'--config network={self.network.id} '
+            '--config ssl-hostname-verification=false '
+            f'--config external-network={self.ext_net.id} '
+            '--config use-floating-ip=true '
+            '--config use-default-secgroup=true '
+            '--debug')
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        return not stdout.channel.recv_exit_status()
+
+    def check_app(self, name='abot-epc-basic', status='active'):
+        """Check application status."""
+        for i in range(10):
+            (_, stdout, stderr) = self.ssh.exec_command(
+                f'/snap/bin/juju status --format short {name}')
+            output = stdout.read().decode("utf-8")
+            self.__logger.debug("stdout:\n%s", output)
+            self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+            if stdout.channel.recv_exit_status():
+                continue
+            ret = re.search(
+                rf'(?=workload:({status})\))', output)
+            if ret:
+                self.__logger.info("%s workload is %s", name, status)
+                break
+            self.__logger.info(
+                "loop %d: %s workload differs from %s", i + 1, name, status)
+            time.sleep(60)
+        else:
+            self.__logger.error("%s workload differs from %s", name, status)
+            return False
         return True
 
     def deploy_vnf(self):
         """Deploy ABOT-OAI-EPC."""
         self.__logger.info("Upload VNFD")
-        descriptor = self.vnf['descriptor']
-        self.__logger.info("Get or create flavor for all Abot-EPC")
-        flavor_settings = FlavorConfig(
-            name=self.vnf['requirements']['flavor']['name'],
-            ram=self.vnf['requirements']['flavor']['ram_min'],
-            disk=10,
-            vcpus=1)
-        flavor_creator = OpenStackFlavor(self.snaps_creds, flavor_settings)
-        flavor_creator.create()
-        self.created_object.append(flavor_creator)
+        scpc = scp.SCPClient(self.ssh.get_transport())
+        scpc.put(
+            '/src/epc-requirements/abot_charm', remote_path='~/',
+            recursive=True)
         self.__logger.info("Deploying Abot-epc bundle file ...")
-        os.system('juju deploy {}'.format('/' + descriptor.get('file_name')))
-        self.__logger.info("Waiting for instances .....")
-        status = os.system('juju-wait')
-        self.__logger.info("juju wait completed: %s", status)
-        self.__logger.info("Deployed Abot-epc on Openstack")
-        nova_client = nova_utils.nova_client(self.snaps_creds)
-        if status == 0:
-            instances = get_instances(nova_client)
-            self.__logger.info("List of Instance: %s", instances)
-            for items in instances:
-                metadata = get_instance_metadata(nova_client, items)
-                if 'juju-units-deployed' in metadata:
-                    sec_group = ('juju-' +
-                                 metadata['juju-controller-uuid'] +
-                                 '-' + metadata['juju-model-uuid'])
-                    self.__logger.info("Instance: %s", sec_group)
-                    break
-            self.__logger.info("Adding Security group rule....")
-            # This will add sctp rule to a common Security Group Created
-            # by juju and shared to all deployed units.
-            self._add_custom_rule(sec_group)
-            self.__logger.info("Copying the feature files to Abot_node ")
-            os.system('juju scp -- -r {}/featureFiles abot-'
-                      'epc-basic/0:~/'.format(self.case_dir))
-            self.__logger.info("Copying the feature files in Abot_node ")
-            os.system("juju ssh abot-epc-basic/0 'sudo rsync -azvv "
-                      "~/featureFiles /etc/rebaca-test-suite"
-                      "/featureFiles'")
-            count = 0
-            while count < 10:
-                epcstatus = os.system('juju status oai-epc | '
-                                      'grep {} | grep {} | grep {}'
-                                      .format('EPC', 'is', 'running'))
-                if epcstatus == 0:
-                    break
-                else:
-                    time.sleep(60)
-                    count = count + 1
-            os.system('juju-wait')
-            return True
-        return False
+        (_, stdout, stderr) = self.ssh.exec_command(
+            'sudo mkdir -p /src/epc-requirements && '
+            'sudo mv abot_charm /src/epc-requirements/abot_charm && '
+            '/snap/bin/juju deploy '
+            '/src/epc-requirements/abot_charm/functest-abot-epc-bundle/'
+            'bundle.yaml')
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        if stdout.channel.recv_exit_status():
+            return not stdout.channel.recv_exit_status()
+        (_, stdout, stderr) = self.ssh.exec_command(
+            'PATH=/snap/bin/:$PATH '
+            f'timeout {JujuEpc.juju_timeout} juju-wait')
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        if stdout.channel.recv_exit_status():
+            return not stdout.channel.recv_exit_status()
+        self.__logger.info("Checking status of ABot and EPC units ...")
+        (_, stdout, stderr) = self.ssh.exec_command('/snap/bin/juju status')
+        output = stdout.read().decode("utf-8")
+        self.__logger.debug("stdout:\n%s", output)
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        if stdout.channel.recv_exit_status():
+            return not stdout.channel.recv_exit_status()
+        for app in ['abot-epc-basic', 'oai-epc', 'oai-hss']:
+            if not self.check_app(app):
+                return False
+        scpc = scp.SCPClient(self.ssh.get_transport())
+        scpc.put(
+            f'{self.case_dir}/featureFiles', remote_path='~/',
+            recursive=True)
+        (_, stdout, stderr) = self.ssh.exec_command(
+            f'timeout {JujuEpc.juju_timeout} /snap/bin/juju scp -- -r -v '
+            '~/featureFiles abot-epc-basic/0:/etc/rebaca-test-suite/')
+        output = stdout.read().decode("utf-8")
+        self.__logger.debug("stdout:\n%s", output)
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        return not stdout.channel.recv_exit_status()
 
     def test_vnf(self):
         """Run test on ABoT."""
         start_time = time.time()
-        self.__logger.info("Running VNF Test cases....")
-        os.system('juju run-action abot-epc-basic/0 run '
-                  'tagnames={}'.format(self.details['test_vnf']['tag_name']))
-        os.system('juju-wait')
+        (_, stdout, stderr) = self.ssh.exec_command(
+            "/snap/bin/juju run-action abot-epc-basic/0 "
+            f"run tagnames={self.details['test_vnf']['tag_name']}")
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        if stdout.channel.recv_exit_status():
+            return not stdout.channel.recv_exit_status()
+        (_, stdout, stderr) = self.ssh.exec_command(
+            'PATH=/snap/bin/:$PATH '
+            f'timeout {JujuEpc.juju_timeout} juju-wait')
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        if stdout.channel.recv_exit_status():
+            return not stdout.channel.recv_exit_status()
         duration = time.time() - start_time
         self.__logger.info("Getting results from Abot node....")
-        os.system('juju scp abot-epc-basic/0:/var/lib/abot-'
-                  'epc-basic/artifacts/TestResults.json {}/.'
-                  .format(self.case_dir))
+        (_, stdout, stderr) = self.ssh.exec_command(
+            f'timeout {JujuEpc.juju_timeout} /snap/bin/juju scp '
+            '-- -v abot-epc-basic/0:'
+            '/var/lib/abot-epc-basic/artifacts/TestResults.json .')
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        if stdout.channel.recv_exit_status():
+            return not stdout.channel.recv_exit_status()
+        scpc = scp.SCPClient(self.ssh.get_transport())
+        scpc.get('TestResults.json', self.res_dir)
         self.__logger.info("Parsing the Test results...")
-        res = (process_abot_test_result('{}/TestResults.'
-                                        'json'.format(self.case_dir)))
+        res = process_abot_test_result(f'{self.res_dir}/TestResults.json')
         short_result = sig_test_format(res)
         self.__logger.info(short_result)
-        self.details['test_vnf'].update(status='PASS',
-                                        result=short_result,
-                                        full_result=res,
-                                        duration=duration)
-
-        self.__logger.info("Test VNF result: Passed: %d, Failed:"
-                           "%d, Skipped: %d", short_result['passed'],
-                           short_result['failures'], short_result['skipped'])
+        self.details['test_vnf'].update(
+            status='PASS', result=short_result, full_result=res,
+            duration=duration)
+        self.__logger.info(
+            "Test VNF result: Passed: %d, Failed:%d, Skipped: %d",
+            short_result['passed'],
+            short_result['failures'], short_result['skipped'])
         return True
 
-    def clean(self):
-        """Clean created objects/functions."""
+    def execute(self):
+        """Prepare testcase (Additional pre-configuration steps)."""
+        assert self.public_auth_url
+        self.__logger.info("Additional pre-configuration steps")
+        try:
+            os.makedirs(self.res_dir)
+        except OSError as ex:
+            if ex.errno != errno.EEXIST:
+                self.__logger.exception("Cannot create %s", self.res_dir)
+                raise Exception from ex
+        self.__logger.info("ENV:\n%s", env.string())
         try:
-            if not self.orchestrator['requirements']['preserve_setup']:
-                self.__logger.info("Removing deployment files...")
-                testresult = os.path.join(self.case_dir, 'TestResults.json')
-                if os.path.exists(testresult):
-                    os.remove(testresult)
-                self.__logger.info("Destroying Orchestrator...")
-                os.system('juju destroy-controller -y abot-controller '
-                          '--destroy-all-models')
+            assert self._install_juju()
+            assert self._install_juju_wait()
+            assert self._register_cloud()
+            assert self._register_credentials()
+            assert self.deploy_orchestrator()
+            assert self.deploy_vnf()
+            assert self.test_vnf()
         except Exception:  # pylint: disable=broad-except
-            self.__logger.warn("Some issue during the undeployment ..")
-            self.__logger.warn("Tenant clean continue ..")
+            self.__logger.exception("juju_epc failed")
+            return 1
+        return 0
 
-        if not self.orchestrator['requirements']['preserve_setup']:
-            self.__logger.info('Remove the Abot_epc OS object ..')
-            super(JujuEpc, self).clean()
-
-        return True
-
-
-# ----------------------------------------------------------
-#
-#               YAML UTILS
-#
-# -----------------------------------------------------------
-def get_config(parameter, file_path):
-    """
-    Returns the value of a given parameter in file.yaml
-    parameter must be given in string format with dots
-    Example: general.openstack.image_name
-    """
-    with open(file_path) as config_file:
-        file_yaml = yaml.safe_load(config_file)
-    config_file.close()
-    value = file_yaml
-    for element in parameter.split("."):
-        value = value.get(element)
-        if value is None:
-            raise ValueError("The parameter %s is not defined in"
-                             " reporting.yaml" % parameter)
-    return value
+    def clean(self):
+        """Clean created objects/functions."""
+        (_, stdout, stderr) = self.ssh.exec_command(
+            '/snap/bin/juju debug-log --replay --no-tail')
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        (_, stdout, stderr) = self.ssh.exec_command(
+            '/snap/bin/juju destroy-controller -y abot-controller '
+            '--destroy-all-models')
+        self.__logger.debug("stdout:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.debug("stderr:\n%s", stderr.read().decode("utf-8"))
+        for fip in self.cloud.list_floating_ips():
+            self.cloud.delete_floating_ip(fip.id)
+        if self.image_alt:
+            self.cloud.delete_image(self.image_alt)
+        if self.flavor_alt:
+            self.orig_cloud.delete_flavor(self.flavor_alt.id)
+        super().clean()
 
 
 def sig_test_format(sig_test):
@@ -462,7 +429,7 @@ def sig_test_format(sig_test):
 
 def process_abot_test_result(file_path):
     """ Process ABoT Result """
-    with open(file_path) as test_result:
+    with open(file_path, encoding='utf-8') as test_result:
         data = json.load(test_result)
         res = []
         for tests in data:
@@ -472,7 +439,7 @@ def process_abot_test_result(file_path):
                 for steps in flatten_steps:
                     steps['result'] = steps['step_status']
                     res.append(steps)
-            except:
+            except Exception:  # pylint: disable=broad-except
                 logging.error("Could not post data to ElasticSearch host")
                 raise
         return res
@@ -514,23 +481,3 @@ def update_data(obj):
         raise
 
     return obj
-
-
-def get_instances(nova_client):
-    """ To get all vm info of a project """
-    try:
-        instances = nova_client.servers.list()
-        return instances
-    except Exception as exc:  # pylint: disable=broad-except
-        logging.error("Error [get_instances(nova_client)]: %s", exc)
-        return None
-
-
-def get_instance_metadata(nova_client, instance):
-    """ Get instance Metadata - Instance ID """
-    try:
-        instance = nova_client.servers.get(instance.id)
-        return instance.metadata
-    except Exception as exc:  # pylint: disable=broad-except
-        logging.error("Error [get_instance_status(nova_client)]: %s", exc)
-        return None