mongo_upgrade_hidden_secondaries.yml

# Upgrades the hidden secondary in a mongo cluster if one exists
#
# This is useful for using the hidden secondary to sniff out any problems with
# your point upgrade before you upgrade your primary/secondary servers using the
# mongo_rolling_upgrade.yml play
#
# This play expects to have access to a config file where MONGO_RS_CONFIG, as described
# in the mongo_3_0 role, is defined, as well as MONGO_ADMIN_USER and MONGO_ADMIN_PASSWORD.
#
# ansible-playbook -i 127.0.0.1, mongo_upgrade_hidden_secondaries.yml -e@/path/to/config-file.yml
#
# This play uses MONGO_RS_CONFIG to find a host to connect to and fetch replset config and build an
# inventory, so you can just target localhost.
#
# If there are no hidden secondaries, the 'Upgrade hidden members' task will just skip.

- name: Find hidden secondaries
  hosts: 127.0.0.1
  connection: local
  gather_facts: False
  tasks:
    - name: Get configuration of mongo cluster
      mongodb_rs_config:
        host: "{{ (MONGO_RS_CONFIG.members|map(attribute='host')|list)[0] }}"
        username: "{{ MONGO_ADMIN_USER }}"
        password: "{{ MONGO_ADMIN_PASSWORD }}"
      register: rs_config
    - name: Build inventory of hidden secondaries
      add_host:
        hostname: "{{ (item.host.split(':'))[0] }}"
        instance_id: "{{ item._id }}"
        groups: hidden_hosts
        ansible_ssh_user: ubuntu
      with_items:
        - "{{ rs_config.hidden }}"

- name: Upgrade hidden members
  hosts: hidden_hosts
  gather_facts: True
  become: True
  vars_files:
    - ../roles/mongo_3_0/defaults/main.yml
  tasks:
    - name: install mongo server and recommends
      apt:
        pkg: "{{ item }}"
        state: present
        install_recommends: yes
        force: yes
        update_cache: yes
      with_items: "{{ mongodb_debian_pkgs }}"
    - name: wait for mongo server to start
      wait_for:
        port: 27017
        delay: 2
    - name: Wait for the replica set to update and (if needed) elect a primary
      mongodb_rs_status:
          host: "{{ ansible_default_ipv4['address'] }}"
          username: "{{ MONGO_ADMIN_USER }}"
          password: "{{ MONGO_ADMIN_PASSWORD }}"
      register: status
      until: status.status is defined and 'PRIMARY' in status.status.members|map(attribute='stateStr')|list
      retries: 5
      delay: 2
      run_once: true