kubespray/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 }}"
{% elif kube_network_plugin == "flannel" %}
OPTIONS="--bip={{ flannel_subnet }} --mtu={{ flannel_mtu }}"
{% endif %}