Merge branch '562-limit-logsize' into 'master'

Resolve "Huge docker log files fills up cluster space"

Closes #562

See merge request openappstack/openappstack!272

ansible/roles/prepare_node/handlers/main.yml

+---
+- name: restart docker
+  service:
+    name: "docker"
+    state: restarted

ansible/roles/prepare_node/tasks/docker.yml

@@ -32,7 +32,7 @@
     - docker
   template:
     dest: /etc/apt/preferences.d/docker
-    src: docker-preferences
+    src: docker/docker-preferences
 
 # Until https://github.com/ansible/ansible/pull/33677 gets implemented, there's
 # no way of downgrading a deb package, so we simply uninstall them first
@@ -66,3 +66,12 @@
       - "docker-ce={{ docker_version }}"
       - "docker-ce-cli={{ docker_version }}"
   become: true
+
+- name: Deploy /etc/docker/daemon.json
+  tags:
+    - docker
+  template:
+    src: docker/daemon.json
+    dest: /etc/docker/daemon.json
+  notify:
+    - restart docker

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

+{
+  "log-driver": "json-file",
+  "log-opts": {
+    "max-size": "50m",
+    "max-file": "2"
+  }
+}