ansible-scylla-monitoring: Allow adding a custom dockerd configuration

Fixes #382

ansible-scylla-monitoring/defaults/main.yml

@@ -89,3 +89,7 @@ prometheus_url: 'https://github.com/prometheus/prometheus/releases/download/v2.3
 
 # Additional arguments to pass to the prometheus binary
 #prometheus_args: "--web.enable-admin-api --storage.tsdb.retention.size=50G"
+
+# Use this variable for setting any custom configuration allowed by dockerd (https://docs.docker.com/reference/cli/dockerd/#on-linux)
+# The content of this variable will be coppied to /etc/docker/daemon.json
+# docker_daemon_custom_config: { "bip": "172.17.0.1/24" }

ansible-scylla-monitoring/tasks/docker.yml

@@ -2,6 +2,13 @@
 - name: Populate service facts
   service_facts:
 
+- name: Add custom dockerd config
+  copy:
+    content: "{{ docker_daemon_custom_config }}"
+    dest: "/etc/docker/daemon.json"
+  become: true
+  when: docker_daemon_custom_config is defined
+
 - name: restart the docker daemon again
   service:
     name: docker