Docker 1.10 Upgrade

Adds a separate playbook for Docker 1.10 upgrade that can be run
standalone on a pre-existing 3.2 cluster. The upgrade will take each
node out of rotation, and remove *all* containers and images on it, as
this is reportedly faster and more storage efficient than performing the
in place 1.10 upgrade.

This process is integrated into the 3.1 to 3.2 upgrade process.

Normal config playbooks now become 3.2 only, and require Docker 1.10.
Users of older environments will have to use an appropriate
openshift-ansible version.

Config playbooks no longer are in the business of upgrading or
downgrading docker.

1 files changed, 30 insertions, 29 deletions

diff --git a/roles/docker/tasks/main.yml b/roles/docker/tasks/main.yml
index b9b2666fb..f002dbc01 100644
--- a/roles/docker/tasks/main.yml
+++ b/roles/docker/tasks/main.yml
@@ -1,41 +1,42 @@
 ---
-# tasks file for docker
-
-- name: Get current installed version if docker_version is specified
+# Going forward we require Docker 1.10 or greater. If the user has a lesser version installed they must run a separate upgrade process.
+- name: Get current installed Docker version
   command: "{{ repoquery_cmd }} --installed --qf '%{version}' docker"
-  when:  not openshift.common.is_atomic | bool and docker_version != ''
-  register: docker_version_result
+  when:  not openshift.common.is_atomic | bool
+  register: curr_docker_version
   changed_when: false
 
-- stat: path=/etc/sysconfig/docker-storage
-  register: docker_storage_check
+# TODO: The use of upgrading var will be removed in the coming upgrade refactor. This is a temporary
+# fix to wory around the fact that right now, this role is called during upgrade, before we're
+# ready to upgrade Docker.
+- name: Fail if Docker upgrade is required
+  fail:
+    msg: "Docker {{ curr_docker_version.stdout }} must be upgraded to Docker 1.10 or greater"
+  when: not upgrading | bool and not curr_docker_version | skipped and curr_docker_version.stdout | default('0.0', True) | version_compare('1.10', '<')
 
-- name: Remove deferred deletion for downgrades from 1.9
+- name: Get latest available version of Docker
   command: >
-    sed -i 's/--storage-opt dm.use_deferred_deletion=true//' /etc/sysconfig/docker-storage
-  when: docker_storage_check.stat.exists | bool and not docker_version_result | skipped and docker_version_result.stdout | default('0.0', True) | version_compare('1.9', '>=') and docker_version | version_compare('1.9', '<')
-
-- name: Downgrade docker if necessary
-  command: "{{ ansible_pkg_mgr }} swap -y docker-* docker-*{{ docker_version }}"
-  register: docker_downgrade_result
-  when: not docker_version_result | skipped and docker_version_result.stdout | default('0.0', True) | version_compare(docker_version, 'gt')
+    {{ repoquery_cmd }} --qf '%{version}' "docker"
+  register: avail_docker_version
+  failed_when: false
+  changed_when: false
+  when: not openshift.common.is_atomic | bool
 
-- name: Install docker
-  action: "{{ ansible_pkg_mgr }} name=docker{{ '-' + docker_version if docker_version is defined and docker_version != '' else '' }} state=present"
-  when: not openshift.common.is_atomic | bool and docker_downgrade_result | skipped
+- name: Verify Docker >= 1.10 is available
+  fail:
+    msg: "Docker {{ avail_docker_version.stdout }} is available, but 1.10 or greater is required"
+  when: not avail_docker_version | skipped and avail_docker_version.stdout | default('0.0', True) | version_compare('1.10', '<')
 
-# If docker were enabled and started before we downgraded it may have entered a
-# failed state. Check for that and clear it if necessary.
-- name: Check that docker hasn't entered failed state
-  command: systemctl show docker
-  register: docker_state
-  changed_when: False
+- stat: path=/etc/sysconfig/docker-storage
+  register: docker_storage_check
 
-- name: Reset docker service state
-  command: systemctl reset-failed docker.service
-  when: " 'ActiveState=failed' in docker_state.stdout "
+# Make sure Docker is installed, but does not update a running version.
+# Docker upgrades are handled by a separate playbook.
+- name: Install Docker
+  action: "{{ ansible_pkg_mgr }} name=docker state=present"
+  when: not openshift.common.is_atomic | bool
 
-- name: Start the docker service
+- name: Start the Docker service
   service:
     name: docker
     enabled: yes
@@ -86,7 +87,7 @@
   notify:
     - restart docker
 
-- name: Set various docker options
+- name: Set various Docker options
   lineinfile:
     dest: /etc/sysconfig/docker
     regexp: '^OPTIONS=.*$'