Install docker-dns-gen on Ubuntu artful

docker-dns-gen.yml

---
- hosts: all

  become: true
  become_method: sudo
  become_user: root

  handlers:
  - name: Restart
    notify: Restart dnsmasq
    shell: systemctl daemon-reload

  - name: Restart dnsmasq
    notify: Restart docker
    service: name=dnsmasq state=restarted

  - name: Restart docker
    service: name=docker state=restarted

  tasks:
  - name: Remove bind9 if present
    failed_when: false
    apt:
      name: bind9
      state: absent

  - name: Install dnsmasq
    apt:
      name: dnsmasq
      state: present

  - name: Run docker-dns
    docker_container:
      name: dns
      image: jderusse/dns-gen
      restart_policy: always
      published_ports: ['54:53/udp']
      capabilities: [NET_BIND_SERVICE]
      volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro

  - name: /etc/systemd/system/docker.service.d/override.conf
    copy:
      dest: /etc/systemd/system/docker.service.d/override.conf
      content: |
        [Service]
        ExecStart=
        ExecStart=/usr/bin/dockerd -H fd:// --bip=172.17.0.1/16 --dns=172.17.0.1

  - name: /etc/systemd/system/dnsmasq.service.d/override.conf
    notify: Restart
    copy:
      dest: /etc/systemd/system/dnsmasq.service.d/override.conf
      content: |
        [Unit]
        After=docker.service

  - name: /etc/dnsmasq.d/upstream.conf
    notify: Restart
    copy:
      dest: /etc/dnsmasq.d/upstream.conf
      content: server=8.8.8.8

  - name: /etc/dnsmasq.d/docker.conf
    notify: Restart
    copy:
      dest: /etc/dnsmasq.d/docker.conf
      content: |
        bind-interfaces
        interface=lo
        interface=docker0
        server=/docker/127.0.0.1#54

  - name: /etc/dnsmasq.d/local.conf
    when: dns_local_resolve is defined
    notify: Restart
    copy:
      dest: /etc/dnsmasq.d/local.conf
      content: |
        {% for dns in dns_local_resolve.split(',') %}
        server=/{{ dns }}/127.0.0.1#54
        {% endfor %}

  - name: Configure /etc/resolv.conf
    copy:
      dest: /etc/resolv.conf
      content: |
        search docker
        nameserver 127.0.0.1

@jpic I'm trying to do this setup by hand (I don't have Ansible, and it doesn't match the advanced setup in the README for docker-dns-gen). But I don't quite grok the code in "/etc/dnsmasq.d/local.conf" - which subsystem is supposed to handle the for loop there? Is it Ansible syntax? I can't find any documentation on dns_local_resolve.split().