条件&循环

https://docs.ansible.com/ansible/latest/user_guide/playbooks_conditionals.html

01.条件：when

1.1 when测试

• 只有 192.168.56.65 机器才会执行

[root@k8s-node2 ~]# vim when.yaml 
---
- hosts: webservers 
  gather_facts: yes

  tasks:
    - name: test
      debug: msg={{ansible_default_ipv4.address}}
      when: ansible_default_ipv4.address=='192.168.56.65'

• 执行

[root@k8s-node2 ~]# ansible-playbook when.yaml 
TASK [test] *************************************************************************************************************************************************
ok: [192.168.56.65] => {
    "msg": "192.168.56.65"
}
skipping: [192.168.56.66]
PLAY RECAP **************************************************************************************************************************************************
192.168.56.65              : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
192.168.56.66              : ok=1    changed=0    unreachable=0    failed=0    skipped=1    rescued=0    ignored=0   

1.2 when安装httpd

• 管理工具是yum用yum安装，管理工具为apt，用apt安装

[root@k8s-node2 ~]# cat when2.html 
- hosts: webservers
  tasks:
    - name: Update apache version - yum
      yum: name=httpd state=present
      when: ansible_pkg_mgr == 'yum'
      notify: restart httpd

    - name: Update apache version - apt
      apt: name=apache2 state=present update_cache=yes
      when: ansible_pkg_mgr == 'apt'
      notify: restart apache2

  handlers:
    - name: restart httpd
      service: name=httpd state=restarted

    - name: restart apache2
      service: name=apache2 state=restarted

• 运行

[root@k8s-node2 ~]# ansible-playbook when2.html

02 循环

2.1 with_list

[root@k8s-node2 ~]# vim with-list1.yaml

---
- hosts: 192.168.56.66
  remote_user: root
  gather_facts: no
  tasks:
  - debug:
      msg: "{{item}}"
    with_list:
    - [1,2,3]
    - [a,b]

2.2 loop

[root@k8s-node2 ~]# vim loop.yaml

---
- hosts: 192.168.56.66
  remote_user: root
  gather_facts: no
  tasks:
  - debug:
      msg: "{{item}}"
    loop:
    - [1,2,3]
    - [a,b]

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