Fix backup using customized container image registry

Change-Id: Ib35743e1c315bb7fd4d0fbd99eaa409a4bf5c792
Story: 2008996
Task: 42658

releasenotes/notes/xena-fix-backup-custom-image-registry.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - Fixed backup creation failed issue when using custom container image
+    registry.

trove/guestagent/datastore/mysql/service.py

@@ -67,7 +67,7 @@ class MySqlApp(service.BaseMySqlApp):
         to openstacktrove/db-backup-mysql5.7:1.0.0
         """
         image = cfg.get_configuration_property('backup_docker_image')
-        name, tag = image.split(':', 1)
+        name, tag = image.rsplit(':', 1)
 
         # Get minor version
         cur_ver = semantic_version.Version.coerce(CONF.datastore_version)

trove/guestagent/utils/docker.py

@@ -91,11 +91,16 @@ def run_container(client, image, name, network_mode="host", volumes={},
     """
     try:
         container = client.containers.get(name)
+        LOG.debug(f'Removing existing container {name}')
         container.remove(force=True)
     except docker.errors.NotFound:
         pass
 
     try:
+        LOG.info(
+            f'Running container {name}, image: {image}, '
+            f'network_mode: {network_mode}, volumes: {volumes}, '
+            f'command: {command}')
         output = client.containers.run(
             image,
             name=name,