ansible

---
- name: a play example
  hosts: all
  remote_user: root
  tasks:
    - name: install nginx package
      yum: name=nginx state=present
    - name: copy nginx.conf to remote server
      copy: src="/a2020/img/data-img.jpg" data-src=nginx.conf dest=/etc/nginx/nginx.conf
    - name: start nginx server
      service:
        name: nginx
        enabled: true
        state: started
...
[root@bogon ~]# ansible-playbook facts.yaml

PLAY [a play example] *****************************************************************************************************************************************************************************************************************

TASK [Gathering Facts] ****************************************************************************************************************************************************************************************************************
ok: [192.168.216.134]
ok: [192.168.216.132]

TASK [install nginx package] **********************************************************************************************************************************************************************************************************
ok: [192.168.216.132]

若在整个PlayBook 的执行过程中，完全未使用过 Facts 变量，此时我们可以将其关闭，以加快PlayBook的执行速度sVV拜客生活常识网

[root@bogon ~]# cat factsout.yaml
---
- name: a play example
  hosts: webservers
  # 关闭 facts 变量收集功能
  gather_facts: no
  remote_user: root
  tasks:
    - name: install nginx package
      yum: name=nginx state=present
    - name: copy nginx.conf to remote server
      copy: src="/a2020/img/data-img.jpg" data-src=nginx.conf dest=/etc/nginx/nginx.conf
    - name: start nginx server
      service:
        name: nginx
        enabled: true
        state: started
...

[root@bogon ~]# ansible-playbook factsout.yaml
[WARNING]: Could not match supplied host pattern, ignoring: webservers

PLAY [a play example] *****************************************************************************************************************************************************************************************************************
skipping: no hosts matched

PLAY RECAP ****************************************************************************************************************************************************************************************************************************

注册变量
通常用于保存一个task任务的执行结果，便于debug使用
或者将此次的task任务结果作为下一task任务的条件
注册变量在playbook中通过register关键字去实现sVV拜客生活常识网

[root@bogon ~]# cat  zuce.yaml
---
- name: install a package and print the result
  hosts: webservers
  remote_user: root
  tasks:
    - name: install nginx package
      yum: name=nginx state=present
      register: install_result  #变量名称
    - name: print result
      debug: var=install_result   #输出结果
...

[root@bogon ~]# ansible-playbook zuce.yaml
[WARNING]: Could not match supplied host pattern, ignoring: webservers

PLAY [install a package and print the result] *****************************************************************************************************************************************************************************************
skipping: no hosts matched

PLAY RECAP ****************************************************************************************************************************************************************************************************************************

变量的优先权
变量这一篇加上，上一篇变量
一大堆
有全局变量，剧本，资产，Facts变量，注册变量
其中facts变量不需要人为声明赋值，注册变量只需要register去声明，而不需要赋值
全局变量，剧本及资产则完全需要人为的声明赋值
*当一个变量同时在全局变量、剧本变量和资产变量中定义时，优先级最高的是全局变量；其次是剧本变量；最后才是资产变量。sVV拜客生活常识网

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