Playbook忽略错误

默认playbook会检测task执行的返回状态，如果遇到错误则会立即终止playbook的后续task执行，然鹅有些时候playbook即使执行错误了也要让其继续执行。

加入参数：ignore_errors:yes 忽略错误

[root@m01 ~]# cat ignore.yml
---
- hosts: all
  tasks:
    - name: Ignore False
      command: /bin/false
      ignore_errors: yes
      
    - name: touch new file
      file:
        path: /tmp/lzd.txt
        state: touch

playbook错误处理

如上所述，当task执行失败时，playbook将不再继续执行，包括如果在task中设置了handler也不会被执行。

但是我们可以采取强制措施...

### 强制调用handler
[root@m01 ~]# cat handler.yml 
- hosts: web_group
  vars:
    - http_port: 8080
  force_handlers: yes  ### 强制调用
  tasks:
    - name: config httpd server
      template:
        src: ./httpd.j2
        dest: /etc/httpd/conf
      notify: 
        - Restart Httpd Server
        - Restart PHP Server
 
    - name: Install Http Server
      apt:
        name: nginx
        state: present
 
    - name: start httpd server
      service:
        name: nginx
        state: started
        enabled: yes
 
  handlers:
    - name: Restart Httpd Server
      systemd:
        name: nginx
        state: restarted 
 
    - name: Restart PHP Server
      systemd:
        name: php-fpm
        state: restarted

###  抑制changed
被管理主机没有发生变化，可以使用参数将change状态改为ok

[root@m01 ~]# cat handler.yml 
- hosts: web_group
  vars:
    - http_port: 8080
  force_handlers: yes
  tasks:
    - name: shell
      shell: netstat -lntup|grep httpd
      register: check_httpd
      changed_when: false
 
    - name: debug
      debug: msg={{ check_httpd.stdout.lines }}


cat changed_when.yml 
- hosts: aa_group
  vars:
    - http_port: 8080
  tasks:
    - name: configure httpd server
      template:
        src: ./httpd.j2
        dest: /etc/httpd/conf/httpd.conf
      notify: Restart Httpd Server
 
    - name: Check HTTPD
      shell: /usr/sbin/nginx -t
      register: httpd_check
      changed_when: 
        - httpd_check.stdout.find('OK')
        - false
 
    - name: start httpd server
      service:
        name: httpd
        state: started
        enabled: yes
 
  handlers:
    - name: Restart Httpd Server
      systemd:
        name: httpd
        state: restarted 


########### 
- name: Check HTTPD
  shell: /usr/sbin/httpd -t
  register: httpd_check
  changed_when: 
    - httpd_check.stdout.find('OK')
    - false

使用 shell 模块运行 HTTPD 的语法检查命令 /usr/sbin/httpd -t。
结果保存在 httpd_check 变量中。
changed_when 语句用于确定该任务是否被视为更改。这里的逻辑是：如果输出中包含 "OK"，则不视为更改。