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====== Ansible tips and tricks ======

===== Replacement in a file =====

==== Replace inplace ====

Replace inplace sshd_config param (at same position)

Ex: 
  #Port 22
  by
  Port 2222
  or 
  Port 2233

<code>
---
- hosts: webservers
  tasks:
    - name: Update SSH configuration to be more secure.
      lineinfile:
        dest: /ansible/sshd_config
        regexp: "{{ item.regexp }}"
        line: "{{ item.line }}"
        state: present
      with_items:
        - regexp: '^(.*)PasswordAuthentication (.*)$'
          line: "PasswordAuthentication no"
        - regexp: '^(.*)PermitRootLogin (.*)$'
          line: "PermitRootLogin no"
        - regexp: '^(.*)Port (.*)$'
          line: "Port 2849"
</code>

==== Insert after / before ====

Use **insertafter** or **insertbefore**
<code>
 tasks:
  - name: add to ansible hosts file
    lineinfile:
      dest: /ansible/sshd_config
      insertafter: '^\[ansible_ssh_host\]'
      line: " test ansible_ssh_host=172.0.0.3"
</code>

==== Comment the all lines of a file ====

<code>
  tasks:
    - replace:
        path: /ansible/sshd_config
        regexp: '^(?!#)'
        replace: '#'
</code>

===== Copy / backup file =====

<code>
 - name: Ansible Copy using Conditional Statements
   hosts: test_group
   tasks:
 	#The env variables can be passed in:
 	#ex: ansible-playbook ~/playbook.yml -e "env=prod"
     - name: Copy Apache config for production
   	 copy:
     	   src: prod_httpd.conf
     	   dest: /etc/httpd/conf/httpd.conf
   	 when: env == 'prod'
</code>
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