ansible/roles/ifupdown2/tasks/main.yml

---
- name: Gather package facts
  package_facts:
    manager: apt

- name: Check if ifupdown2 is installed
  set_fact:
    must_mask: "{{ 'ifupdown2' not in ansible_facts.packages }}"

- name: Mask networking before installing ifupdown2
  systemd:
    name: networking.service
    masked: true
  when: must_mask

- name: Install ifupdown2 (debian version)
  apt:
    name: ifupdown2
  when: "not ifupdown2__need_upstream_version"

# FIXME: ifupdown2 3.1.0-1 is not yet available, but is needed for its
# better VxLAN support
# See https://github.com/CumulusNetworks/ifupdown2/issues/211
- name: Install upstream version of ifupdown2
  block:
    - name: Upload .deb file
      copy:
        src: ifupdown2_3.1.0-1_all.deb
        dest: /tmp/ifupdown2_3.1.0-1_all.deb
    - name: Install .deb file
      apt:
        deb: /tmp/ifupdown2_3.1.0-1_all.deb
  when: "ifupdown2__need_upstream_version"

- name: Unmask networking now that ifupdown2 is installed
  systemd:
    name: networking.service
    masked: false
  when: must_mask

- name: Configure ifupdown2
  template:
    src: interfaces.j2
    dest: /etc/network/interfaces
    owner: root
    group: root
    mode: u=rw,g=r,o=
  notify:
    - Restart networking
    - Bring all interfaces up

- name: Enable and start networking
  systemd:
    name: networking.service
    state: started
    enabled: true
...