roles: docker: Add support for SUSE distributions

Add support for installing Docker on SUSE distributions. The Docker
repository at https://yum.dockerproject.org/repo/main/ does not support
recent openSUSE distributions so the only alternative is to use the
packages from the distro repositories. This however renders the
'docker_version' Ansible variable useless on SUSE.

roles/docker/tasks/main.yml

@@ -15,6 +15,14 @@
   tags:
     - facts
 
+# https://yum.dockerproject.org/repo/main/opensuse/ contains packages for an EOL
+# openSUSE version so we can't use it. The only alternative is to use the docker
+# packages from the distribution repositories.
+- name: Warn about Docker version on SUSE
+  debug:
+    msg: "SUSE distributions always install Docker from the distro repos"
+  when: ansible_pkg_mgr == 'zypper'
+
 - include_tasks: set_facts_dns.yml
   when: dns_mode != 'none' and resolvconf_mode == 'docker_dns'
   tags:
@@ -43,7 +51,7 @@
   retries: 4
   delay: "{{ retry_stagger | random + 3 }}"
   with_items: "{{ docker_repo_key_info.repo_keys }}"
-  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS", "RedHat"] or is_atomic)
+  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS", "RedHat", "Suse"] or is_atomic)
 
 - name: ensure docker-ce repository is enabled
   action: "{{ docker_repo_info.pkg_repo }}"
@@ -51,7 +59,7 @@
     repo: "{{item}}"
     state: present
   with_items: "{{ docker_repo_info.repos }}"
-  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS", "RedHat"] or is_atomic) and (docker_repo_info.repos|length > 0)
+  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS", "RedHat", "Suse"] or is_atomic) and (docker_repo_info.repos|length > 0)
 
 - name: ensure docker-engine repository public key is installed
   action: "{{ dockerproject_repo_key_info.pkg_key }}"
@@ -64,7 +72,7 @@
   retries: 4
   delay: "{{ retry_stagger | random + 3 }}"
   with_items: "{{ dockerproject_repo_key_info.repo_keys }}"
-  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS", "RedHat"] or is_atomic)
+  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS", "RedHat", "Suse"] or is_atomic)
 
 - name: ensure docker-engine repository is enabled
   action: "{{ dockerproject_repo_info.pkg_repo }}"
@@ -72,7 +80,7 @@
     repo: "{{item}}"
     state: present
   with_items: "{{ dockerproject_repo_info.repos }}"
-  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS", "RedHat"] or is_atomic) and (dockerproject_repo_info.repos|length > 0)
+  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS", "RedHat", "Suse"] or is_atomic) and (dockerproject_repo_info.repos|length > 0)
 
 - name: Configure docker repository on RedHat/CentOS
   template:

roles/docker/templates/docker.service.j2

@@ -7,6 +7,9 @@ Wants=docker-storage-setup.service
 {% elif ansible_os_family == "Debian" %}
 After=network.target docker.socket
 Wants=docker.socket
+{% elif ansible_os_family == "Suse" %}
+After=network.target containerd.socket containerd.service
+Requires=containerd.socket containerd.service
 {% endif %}
 
 [Service]
@@ -19,6 +22,9 @@ ExecReload=/bin/kill -s HUP $MAINPID
 Delegate=yes
 KillMode=process
 ExecStart={{ docker_bin_dir }}/docker{% if installed_docker_version.stdout|version_compare('17.03', '<') %} daemon{% else %}d{% endif %} \
+{% if ansible_os_family == "Suse" %}
+          --containerd /run/containerd/containerd.sock --add-runtime oci=/usr/bin/docker-runc \
+{% endif %}
           $DOCKER_OPTS \
           $DOCKER_STORAGE_OPTIONS \
           $DOCKER_NETWORK_OPTIONS \

roles/docker/vars/suse.yml

@@ -0,0 +1,15 @@
+---
+docker_kernel_min_version: '0'
+
+docker_package_info:
+  pkg_mgr: zypper
+  pkgs:
+    - name: docker
+
+docker_repo_key_info:
+  pkg_key: ''
+  repo_keys: []
+
+docker_repo_info:
+  pkg_repo: ''
+  repos: []