19.addetcd.yml

# add new-etcd node, one at a time
- hosts:
  - new-etcd
  tasks:
  - name: add a new etcd member
    shell: "ETCDCTL_API=3 {{ bin_dir }}/etcdctl member add {{ NODE_NAME }} --peer-urls=https://{{ inventory_hostname }}:2380"
    delegate_to: "{{ groups.etcd[0] }}"
    when: "inventory_hostname == groups['new-etcd'][0]"

# start the new-etcd node
- hosts:
  - new-etcd
  roles:
  - { role: chrony, when: "hostvars[groups.deploy[0]]['NTP_ENABLED'] == 'yes' and inventory_hostname == groups['new-etcd'][0]" } 
  - { role: prepare, when: "inventory_hostname == groups['new-etcd'][0]" }
  - { role: new-etcd, when: "inventory_hostname == groups['new-etcd'][0]" }

# restart the original etcd cluster with the new configuration 
- hosts:
  - etcd
  roles:
  - { role: new-etcd, when: "groups['new-etcd']|length > 0" }

# modify the ansible hosts file
- hosts:
  - new-etcd
  tasks:
  - name: tag new-etcd's node FINISHED=yes
    lineinfile:
      dest: "{{ base_dir }}/hosts"
      state: present
      regexp: '{{ NODE_NAME }}'
      line: "{{ inventory_hostname }} NODE_NAME={{ NODE_NAME }} FINISHED=yes"
    connection: local
    when: "inventory_hostname == groups['new-etcd'][0]"

  - name: cp new-etcd's node to etcd group
    lineinfile:
      dest: "{{ base_dir }}/hosts"
      state: present
      insertafter: '^\[etcd'
      firstmatch: yes
      line: "{{ inventory_hostname }} NODE_NAME={{ NODE_NAME }}"
    connection: local
    when: "inventory_hostname == groups['new-etcd'][0]"

- hosts: deploy
  tasks:
  - name: rm new-etcd's node
    lineinfile:
      dest: "{{ base_dir }}/hosts"
      state: absent
      regexp: 'FINISHED=yes'
    connection: local