CHAPTER 5 : Implementing Task Control

 

 

Simple Loops :

[root@control]mkdir playbook_test &&  cd playbook

[root@control]vim /playbook_test/cusers_playbook.yml

[root@control]$ vi create_users.yaml

- hosts: centos_webserver
  become: yes
  tasks:
    - name: Create new users
      user:
        name: '{{ item.name }}'
        uid: '{{ item.uid }}'
        state: present

      loop:
        - name: tiya
          uid: 1020
        - name: riya
          uid: 1030
        - name: jack
          uid: 1040 

[root@control]$ansible-playbook   create_user.yml

Example of start service

 [root@control]$vim  service_start.yml 

- name: Postfix and Dovecot are running 
  service:
    name: "{{ item }}"
    state: started
  with_items:
   - postfix 
   - dovecot    

 

[root@control]$ansible-playbook   service_start.yml

Nested Loops

[root@control]$vim  user_for_dbs.yml   

tasks: 

- name: All DB users have privileges on all databases
     mysql_user:  
     name: "{{ item[0] }}"
       priv: "{{ item[1] }}.*:ALL"
        append_privs: yes
        password: redhat
     with_nested:
        [ 'joe', 'jane' ]
        [ 'clientdb', 'employeedb', 'providerdb' ]

 Example of install webserver : 

without loop : 

[root@control]$vim  webserver_install.yml 

- hosts: all 

     vars: 

     run_my_task: true 

     tasks: 

   - name: httpd package is installed 

       yum: 

        name: httpd 

       when: run_my_task

 

Example With Loop

[root@control]$vim  webserver_install.yml 

- hosts: all 

     vars: 

       my_service: httpd

     tasks: 

      - name: "{{ my_service }} package is installed"

        yum: 

         name: "{{ my_service }}"

        when: my_service is defined