provides initial docker options support

inventory/group_vars/all.yml

@@ -128,3 +128,7 @@ dns_server: "{{ kube_service_addresses|ipaddr('net')|ipaddr(2)|ipaddr('address')
 #http_proxy: ""
 #https_proxy: ""
 #no_proxy: ""
+
+##A string of extra options to pass to the docker daemon.
+##This string should be exactly as you wish it to appear.
+#docker_options: ""

roles/network_plugin/calico/templates/docker

 # Deployed by Ansible
 {% if ansible_service_mgr in ["sysvinit","upstart"] and kube_network_plugin == "flannel" and ansible_os_family == "Debian" %}
-DOCKER_OPTS="--bip={{ flannel_subnet }} --mtu={{ flannel_mtu }}"
+DOCKER_OPTS="--bip={{ flannel_subnet }} --mtu={{ flannel_mtu }} {% if docker_options is defined %}{{ docker_options }}{% endif %}"
 {% elif kube_network_plugin == "flannel" and ansible_os_family == "RedHat" %}
-DOCKER_NETWORK_OPTIONS="--bip={{ flannel_subnet }} --mtu={{ flannel_mtu }}"
+DOCKER_NETWORK_OPTIONS="--bip={{ flannel_subnet }} --mtu={{ flannel_mtu }} {% if docker_options is defined %}{{ docker_options }}{% endif %}"
 {% elif kube_network_plugin == "flannel" %}
-OPTIONS="--bip={{ flannel_subnet }} --mtu={{ flannel_mtu }}"
+OPTIONS="--bip={{ flannel_subnet }} --mtu={{ flannel_mtu }} {% if docker_options is defined %}{{ docker_options }}{% endif %}"
 {% endif %}

roles/network_plugin/flannel/templates/docker

 # Deployed by Ansible
 {% if (ansible_service_mgr in ["sysvinit","upstart"] and kube_network_plugin == "flannel" and ansible_os_family == "Debian") or
    (kube_network_plugin == "flannel" and ansible_os_family == "CoreOS") %}
-DOCKER_OPTS="--bip={{ flannel_subnet }} --mtu={{ flannel_mtu }}"
+DOCKER_OPTS="--bip={{ flannel_subnet }} --mtu={{ flannel_mtu }} {% if docker_options is defined %}{{ docker_options }}{% endif %}"
 {% elif kube_network_plugin == "flannel" %}
-OPTIONS="--bip={{ flannel_subnet }} --mtu={{ flannel_mtu }}"
+OPTIONS="--bip={{ flannel_subnet }} --mtu={{ flannel_mtu }} {% if docker_options is defined %}{{ docker_options }}{% endif %}"
 {% endif %}

roles/network_plugin/weave/templates/docker

 # Deployed by Ansible
-DOCKER_OPTS=""
+DOCKER_OPTS="{% if docker_options is defined %}{{ docker_options }}{% endif %}"