Ansible way to stop a service only if it needs to be upgraded

Question

In an ansible playbook I want to stop MariaDB if an upgrade is needed (restart from the RPM package does not always work in my situation). I\'m quite new to ansible.

Answer 1

You can hide warning with:

- name: "Check if MariaDB needs to be upgraded"
  shell: "yum check-update MariaDB-server|grep MariaDB|wc -l"
  args:
    warn: false
  register: needs_update

Or you can trick Ansible to execute yum task in check_mode:

- name: "Check if MariaDB needs to be upgraded (CHECK MODE!)"
  yum:
    name: MariaDB-server
    state: latest
  check_mode: yes
  register: needs_update_check

- name: "Stop mysql service"
  service:
    name: mysql
    state: stopped
  when: needs_update_check | changed

Please, test this code before use.

Answer 2

The best way to handle this is use a "handler" eg something along the lines of

tasks:
  - name: Update db
    yum: name=MariaDB-server state=latest
    notify:
      - stop db

handlers:
  -  name: stop db  
     service: name=MariaDB-server state=stopped

You can specify multiple handlers if you need to do multiple things, but if you just want to restart the db, use restarted instead of stopped

http://docs.ansible.com/ansible/playbooks_best_practices.html