Allow to configure docker for Zun

Change-Id: Icf3f01516185afb7b9f642407b06a0204c36ecbe
Closes-Bug: #1840315
Signed-off-by: Radosław Piliszek <radoslaw.piliszek@gmail.com>

ansible/group_vars/all.yml

@@ -106,6 +106,10 @@ docker_restart_policy: "unless-stopped"
 # '0' means unlimited retries (applies only to 'on-failure' policy)
 docker_restart_policy_retry: "10"
 
+# Extra docker options for Zun
+docker_configure_for_zun: "no"
+docker_zun_options: -H fd:// -H tcp://{{ api_interface_address }}:2375 --cluster-store=etcd://{% for host in groups['etcd'] %}{{ hostvars[host]['ansible_' + hostvars[host]['api_interface']]['ipv4']['address'] }}:{{ hostvars[host]['etcd_client_port'] }}{% if not loop.last %},{% endif %}{% endfor %}
+
 # Common options used throughout Docker
 docker_common_options:
   auth_email: "{{ docker_registry_email }}"

ansible/roles/baremetal/templates/docker_systemd_service.j2

@@ -1,3 +1,3 @@
 [Service]
 ExecStart=
-ExecStart=/usr/bin/{{ docker_binary_name|default("docker daemon", true) }}{% if docker_registry_insecure | bool %} --insecure-registry {{ docker_registry }}{% endif %}{% if docker_storage_driver %} --storage-driver {{ docker_storage_driver }}{% endif %}{% if docker_runtime_directory %} --graph {{ docker_runtime_directory }}{% endif %}{% if docker_custom_option %} {{ docker_custom_option }}{% endif %} --log-opt max-file={{ docker_log_max_file }} --log-opt max-size={{ docker_log_max_size }}
+ExecStart=/usr/bin/{{ docker_binary_name|default("docker daemon", true) }}{% if docker_registry_insecure | bool %} --insecure-registry {{ docker_registry }}{% endif %}{% if docker_storage_driver %} --storage-driver {{ docker_storage_driver }}{% endif %}{% if docker_runtime_directory %} --graph {{ docker_runtime_directory }}{% endif %}{% if docker_custom_option %} {{ docker_custom_option }}{% endif %}{% if docker_configure_for_zun|bool %} {{ docker_zun_options }}{% endif %} --log-opt max-file={{ docker_log_max_file }} --log-opt max-size={{ docker_log_max_size }}

doc/source/reference/compute/zun-guide.rst

@@ -11,23 +11,8 @@ For more details about Zun, see `OpenStack Zun Documentation
 Preparation and Deployment
 --------------------------
 
-Zun requires kuryr and etcd services, for more information about how to
-configure kuryr refer to :doc:`../containers/kuryr-guide`.
-
-To allow Zun Compute connect to the Docker Daemon, add the following in the
-``docker.service`` file on each zun-compute node.
-
-.. code-block:: ini
-
-   ExecStart= -H tcp://<DOCKER_SERVICE_IP>:2375 -H unix:///var/run/docker.sock --cluster-store=etcd://<DOCKER_SERVICE_IP>:2379 --cluster-advertise=<DOCKER_SERVICE_IP>:2375
-
-.. note::
-
-   ``DOCKER_SERVICE_IP`` is zun-compute host IP address. ``2375`` is port that
-   allows Docker daemon to be accessed remotely.
-
-By default zun is disabled in the ``group_vars/all.yml``.
-In order to enable it, you need to edit the file globals.yml and set the
+By default Zun and its dependencies are disabled.
+In order to enable Zun, you need to edit globals.yml and set the
 following variables:
 
 .. code-block:: yaml
@@ -35,8 +20,20 @@ following variables:
    enable_zun: "yes"
    enable_kuryr: "yes"
    enable_etcd: "yes"
+   docker_configure_for_zun: "yes"
 
-Deploy the OpenStack cloud and zun.
+Docker reconfiguration requires reboostrapping before deploy.
+Make sure you understand the consequences of restarting Docker.
+Please see :ref:`rebootstrapping` for details.
+If it's initial deploy, then there is nothing to worry about
+because it's initial bootstrapping as well and there are no
+running services to affect.
+
+.. code-block:: console
+
+   $ kolla-ansible bootstrap-servers
+
+Finally deploy:
 
 .. code-block:: console
 

doc/source/reference/deployment-and-bootstrapping/bootstrap-servers.rst

@@ -51,6 +51,8 @@ to override the inventory defaults:
 
    kolla-ansible bootstrap-servers -i INVENTORY -e ansible_user=<bootstrap user> -e ansible_python_interpreter=/usr/bin/python
 
+.. _rebootstrapping:
+
 Subsequent bootstrap considerations
 -----------------------------------
 

etc/kolla/globals.yml

@@ -58,6 +58,8 @@
 #docker_registry_username: "sam"
 #docker_registry_password: "correcthorsebatterystaple"
 
+#docker_configure_for_zun: "no"
+
 ###################
 # Messaging options
 ###################

releasenotes/notes/configure-docker-for-zun-8b4e647d883da42f.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Kolla Ansible can now configure deployed docker for Zun.
+    Enable docker_configure_for_zun (disabled by default to retain backwards
+    compatibility).