Add LBaaSv2 volume-based Amphora test

Enable Amphora to run instances booted from a volume by flipping the
config option `enable-volume-based-amphora` to True and checking volumes
attached to the amphora instances.

Depends-On: https://review.opendev.org/c/openstack/charm-octavia/+/810567
Related-Bug: https://launchpad.net/bugs/1901732

zaza/openstack/charm_tests/octavia/setup.py

@@ -35,6 +35,7 @@ def ensure_lts_images():
     glance_setup.add_lts_image(image_name='bionic', release='bionic')
     glance_setup.add_lts_image(image_name='focal', release='focal')
     glance_setup.add_lts_image(image_name='jammy', release='jammy')
+    glance_setup.add_lts_image(image_name='noble', release='noble')
 
 
 def add_amphora_image(image_url=None):

zaza/openstack/charm_tests/octavia/tests.py

@@ -14,6 +14,7 @@
 
 """Encapsulate octavia testing."""
 
+import json
 import logging
 import subprocess
 import tenacity
@@ -34,6 +35,7 @@
     LoadBalancerUnexpectedState,
     LoadBalancerUnrecoverableError,
 )
+from zaza.openstack.utilities.os_versions import CompareOpenStack
 
 LBAAS_ADMIN_ROLE = 'load-balancer_admin'
 
@@ -202,6 +204,8 @@ def setUpClass(cls):
             openstack_utils.get_neutron_session_client(cls.keystone_session))
         cls.octavia_client = ObjectRetrierWraps(
             openstack_utils.get_octavia_session_client(cls.keystone_session))
+        cls.cinder_client = ObjectRetrierWraps(
+            openstack_utils.get_cinder_session_client(cls.keystone_session))
         cls.RESOURCE_PREFIX = 'zaza-octavia'
 
         # NOTE(fnordahl): in the event of a test failure we do not want to run
@@ -456,7 +460,7 @@ def _get_payload(ip):
              'http://{}/'.format(ip)],
             universal_newlines=True)
 
-    def test_create_loadbalancer(self):
+    def create_loadbalancer(self, ensure_volume_backed=False):
         """Create load balancer."""
         # Prepare payload instances
         # First we allow communication to port 80 by adding a security group
@@ -526,11 +530,56 @@ def test_create_loadbalancer(self):
                          .format(snippet, provider,
                                  lb_fp['floating_ip_address']))
 
+            if ensure_volume_backed:
+                amphora_list = self.octavia_client.amphora_list()
+                self.assertTrue(len(amphora_list) > 0)
+                attached_volumes = []
+                for amphora in amphora_list.get('amphorae', []):
+                    server_id = amphora['compute_id']
+                    logging.info("Checking amphora {} server {} for attached "
+                                 "volumes".format(amphora['id'], server_id))
+                    volumes = self.nova_client.volumes.get_server_volumes(
+                        server_id)
+                    logging.info('amphora {} server {} has volumes={}'.
+                                 format(amphora['id'],
+                                        server_id, volumes))
+                    attached_volumes.append(json.dumps(vars(volumes)))
+
+                self.assertTrue(len(attached_volumes) > 0)
+                logging.info("Amphora volumes creation successful: {}".format(
+                             attached_volumes))
+
         # If we get here, it means the tests passed
         self.run_resource_cleanup = True
 
+    def test_create_loadbalancer(self):
+        """Test creating a load balancer."""
+        self.create_loadbalancer()
+
 
 class OctaviaTempestTestK8S(tempest_tests.TempestTestScaleK8SBase):
     """Test octavia k8s scale out and scale back."""
 
     application_name = "octavia"
+
+
+class VolumeBasedAmphoraTest(LBAASv2Test):
+    """LBaaSv2 Volume-based Amphora tests."""
+
+    @classmethod
+    def setUpClass(cls):
+        """Run class setup for LBaaSv2 Volume-based amphora tests."""
+        super(VolumeBasedAmphoraTest, cls).setUpClass()
+        os_versions = openstack_utils.get_current_os_versions(['octavia'])
+        if CompareOpenStack(os_versions['octavia']) < 'ussuri':
+            cls.skipTest('Run only for Openstack Ussuri and newer releases.')
+            return
+
+    def test_volume_based_amphora(self):
+        """Test creating a load balancer that uses volume-based amphora."""
+        default_charm_config = {'enable-volume-based-amphora': False}
+        alternate_charm_config = {'enable-volume-based-amphora': True}
+        with self.config_change(default_charm_config,
+             alternate_charm_config, reset_to_charm_default=True):
+            logging.info("Testing create volume-backed amphora loadbalancer")
+            self.create_loadbalancer(ensure_volume_backed=True)