c12s-kubespray/roles/container-engine/docker/templates/docker-options.conf.j2

[Service]
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 %}