kubespray/roles/network_plugin/weave/tasks/seed.yml

---
- name: Weave seed | Set seed if first time
  set_fact:
    seed: '{% for host in groups["k8s-cluster"] %}{{ hostvars[host]["ansible_default_ipv4"]["macaddress"] }}{% if not loop.last %},{% endif %}{% endfor %}'
  when: "weave_seed == 'uninitialized'"
  run_once: true
  tags:
    - confweave

- name: Weave seed | Set seed if not first time
  set_fact:
    seed: '{{ weave_seed }}'
  when: "weave_seed != 'uninitialized'"
  run_once: true
  tags:
    - confweave

- name: Weave seed | Set peers if fist time
  set_fact:
    peers: '{{ weave_ip_current_cluster }}'
  when: "weave_peers == 'uninitialized'"
  run_once: true
  tags:
    - confweave

- name: Weave seed | Set peers if existing peers
  set_fact:
    peers: '{{ weave_peers }}{% for ip in weave_ip_current_cluster.split(" ") %}{% if ip not in weave_peers.split(" ") %} {{ ip }}{% endif %}{% endfor %}'
  when: "weave_peers != 'uninitialized'"
  run_once: true
  tags:
    - confweave

- name: Weave seed | Save seed
  lineinfile:
    dest: "./inventory/group_vars/k8s-cluster.yml"
    state: present
    regexp: '^weave_seed:'
    line: 'weave_seed: {{ seed }}'
  become: no
  delegate_to: 127.0.0.1
  run_once: true
  tags:
    - confweave

- name: Weave seed | Save peers
  lineinfile:
    dest: "./inventory/group_vars/k8s-cluster.yml"
    state: present
    regexp: '^weave_peers:'
    line: 'weave_peers: {{ peers }}'
  become: no
  delegate_to: 127.0.0.1
  run_once: true
  tags:
    - confweave