ansible conditionals

When 사용하기

예제1: OS 에 따라 package manager(apt / yum) 을 각각 다르게 사용하기

- name: Install NGINX
  hosts: web_servers
  tasks:
    - name: Install NGINX on Debian
      apt:
        name: nginx
        state: present
      when: ansible_os_family == "Debian" and ansible_distribution_version == "16.04"

    - name: Install NGINX on Redhat
      yum:
        name: nginx
        state: present
      when: ansible_os_family == "RedHat" or ansible_os_family == "SUSE"

ansible_os_family, ansible_distribution_version 은 ansible 내부에 이미 정의된 variable 

 

예제2

- name: 'Am I an Adult or a Child?'
  hosts: web_servers
  vars:
    age: 25
  tasks:
    - command: 'echo "I am a Child"'
      when: "age < 18"
    - command: 'echo "I am an Adult"'
      when: "age >= 18"

 

Conditionals in Loops

- name: Install Softwares
  hosts: web_servers
  vars:
    packages:
      - name: nginx
        required: True
      - name: mysql
        required: True
      - name: apache
        required: False
  tasks:
    - name: Install "{{ item.name }} on Debian
      apt:
        name: "{{ item.name }}"
        state: present
      when: item.required == True
      loop: "{{ packages }}"

 

Conditionals and Register

- name: Check status of a service and email if its down
  hosts: web_servers
  tasks:
    - command: service httpd status
      register: result
    - mail:
      to: admin@company.com
      subject: Service Alert
      body: Httpd service is down
      when: result.stdout.find('down') != -1

 

참고: https://www.udemy.com/course/learn-ansible/