Support docker live-restore option

Change-Id: Ifc17d132322f84e92655c7ee45dd3566a32ef4b2
Story: 2001783
Task: 12496

ansible/roles/docker/defaults/main.yml

@@ -34,6 +34,9 @@ docker_registry_ca:
 # MTU to pass through to containers not using net=host
 docker_daemon_mtu: 1500
 
+# Enable live-restore on docker daemon
+docker_daemon_live_restore: true
+
 # Upper constraints file which is passed to pip when installing packages
 # into a venv.
 docker_upper_constraints_file:

ansible/roles/docker/templates/daemon.json.j2

@@ -2,6 +2,9 @@
   "storage-driver": "{% if docker_storage_driver == 'devicemapper' %}devicemapper{% else %}overlay{% endif %}",
 {% if docker_daemon_mtu %}
   "mtu": {{ docker_daemon_mtu }},
+{% endif %}
+{% if docker_daemon_live_restore %}
+  "live-restore": {{ docker_daemon_live_restore | to_json }},
 {% endif %}
   "storage-opts": [
 {% if docker_storage_driver == 'devicemapper' %}

doc/source/release-notes.rst

@@ -10,6 +10,9 @@ Features
 
 * Adds support for configuration of custom repositories. ``yum_custom_repos``
   should be a dict of repositories.
+* Adds support for configuration of live-restore option in docker. This is
+  enabled by setting the variable ``docker_daemon_live_restore``. Option is
+  set to true by default.
 
 Upgrade Notes
 -------------

etc/kayobe/docker.yml

@@ -28,6 +28,9 @@
 # CA of docker registry
 #docker_registry_ca:
 
+# Enable live-restore on docker daemon
+#docker_daemon_live_restore:
+
 ###############################################################################
 # Dummy variable to allow Ansible to accept this file.
 workaround_ansible_issue_8743: yes