parametrized iptables options for docker daemon

inventory/sample/group_vars/k8s-cluster.yml

@@ -140,6 +140,9 @@ dns_domain: "{{ cluster_name }}"
 # Path used to store Docker data
 docker_daemon_graph: "/var/lib/docker"
 
+## Used to set docker daemon iptables options to true
+#docker_iptables_enabled: "true"
+
 ## A string of extra options to pass to the docker daemon.
 ## This string should be exactly as you wish it to appear.
 ## An obvious use case is allowing insecure-registry access

roles/docker/defaults/main.yml

@@ -40,3 +40,6 @@ dockerproject_rh_repo_base_url: 'https://yum.dockerproject.org/repo/main/centos/
 dockerproject_rh_repo_gpgkey: 'https://yum.dockerproject.org/gpg'
 dockerproject_apt_repo_base_url: 'https://apt.dockerproject.org/repo'
 dockerproject_apt_repo_gpgkey: 'https://apt.dockerproject.org/gpg'
+
+# Used to set docker daemon iptables options
+docker_iptables_enabled: "false"

roles/docker/templates/docker-options.conf.j2

@@ -1,5 +1,5 @@
 [Service]
-Environment="DOCKER_OPTS={{ docker_options|default('') }} --iptables=false"
+Environment="DOCKER_OPTS={{ docker_options|default('') }} --iptables={{ docker_iptables_enabled | default('false') }}"
 {% if docker_mount_flags is defined and docker_mount_flags != "" %}
 MountFlags={{ docker_mount_flags }}
 {% endif %}