ansible quick tips for some modules

ansbile_tips.yml

 # Check existing
 - name: Ansible check file exists.
    stat:
      path: /etc/filename
    register: file_status
  - debug:
      msg: "File exists..."
    when: file_status.stat.exists
  - debug:
      msg: "File not found"
    when: not file_status.stat.exists
    
- name: check phantomjs executable is present
  shell: "which phantomjs"
  register: result
  ignore_errors: true

- fail:
    msg: "PhantomJS is not found! You need to install it first."
  when: result.rc != 0


# Set owner for the directory recursively
- file:
  path: "/path/to/directory"
  owner: "{{ ansible_user }}"
  group: "{{ ansible_user }}"
  recurse: true
become: true
  
# Trigger handlers always
- name: restart app with supervisor
  command: "/bin/true"
  notify:
    - restart app
    
-  debug: msg="trigger nginx-restart"
   notify: nginx-restart
   changed_when: true
   
# Check command output to match
- name: Check which python version is installed
  shell: "python3 --version"
  register: python_output
  ignore_errors: true
  
  - debug:
      var: python_output
    when: python_output.stdout != "Python {{ python_version }}"
    
# Define variable
- set_fact:
    one_fact: something
    other_fact: "{{ local_var * 2 }}"
    another_fact: "{{ some_registered_var.results | map(attribute='ansible_facts.some_fact') | list }}"