ansible-playbook-logic逻辑实现

1.when

根据某一判断条件（变量、执行结果等）来实现逻辑

查看whwen_ansible.yml

[root@localhost logic]# cat whwen_ansible.yml 
---
 - hosts: webservers
   remote_user: root
   tasks:
    - name: test
      debug: 
       msg: "测试"
      when: ansible_os_family == "Debian"

执行whwen_ansible.yml

[root@localhost logic]# ansible-playbook -C whwen_ansible.yml 

PLAY [webservers] ********************************************************************************************************

TASK [Gathering Facts] ********************************************************************************************************
ok: [43.143.98.52]
ok: [192.168.235.152]

TASK [test] ********************************************************************************************************
skipping: [43.143.98.52]
skipping: [192.168.235.152]

PLAY RECAP ********************************************************************************************************
192.168.235.152            : ok=1    changed=0    unreachable=0    failed=0    skipped=1    rescued=0    ignored=0   
43.143.98.52               : ok=1    changed=0    unreachable=0    failed=0    skipped=1    rescued=0    ignored=0   

修改whwen_ansible.yml中when: ansible_os_family == "RedHat"，再次查看whwen_ansible.yml

[root@localhost logic]# cat whwen_ansible.yml 
---
 - hosts: webservers
   remote_user: root
   tasks:
    - name: test
      debug: 
       msg: "测试"
      when: ansible_os_family == "RedHat"

执行whwen_ansible.yml

[root@localhost logic]# ansible-playbook -C whwen_ansible.yml 

PLAY [webservers] **************************************************************************************************

TASK [Gathering Facts] *********************************************************************************************
ok: [43.143.98.52]
ok: [192.168.235.152]

TASK [test] ********************************************************************************************************
ok: [192.168.235.152] => {
    "msg": "测试"
}
ok: [43.143.98.52] => {
    "msg": "测试"
}

PLAY RECAP ********************************************************************************************************
192.168.235.152            : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
43.143.98.52               : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

 ansible_os_family是一个facts的一个变量。要查看ansible_os_family变量的值，你可以使用ansible all -m setup | grep ansible_os_family命令。这个命令将在所有主机上运行setup模块，并从输出中过滤出ansible_os_family的值。或者是

ansible all -m setup -a 'filter=ansible_os_family'