ansible-role-docker_host/templates/daemon.json.j2

{
  "data-root": "{{ docker_host_data_dir }}",
  "default-address-pools": [
    { "base": "172.18.0.0/16", "size": 24 }
  ]{% if docker_host_user_namespaces is true %},
  "userns-remap": "default"
{% endif %}

}