4.Ansible Task控制

1.tag标签(调试)

--skip-tags install_nfs 跳过此标签
-t 指定标签名

[root@manager tasks]# cat task_nfs.yml 
- hosts: webservers
  tasks:

        #对一个任务打多个标签
    - name: Install Nfs Server
      yum: 
        name: nfs-utils
        state: present
      tags:
        - install_nfs
        - install_nfs-server


        #对一个任务打一个标签
    - name: Service Nfs Server
      service:
        name: nfs-server 
        state: started
        enabled: yes
      tags: start_nfs-server


ansible-playbook -i ../hosts  task_nfs.yml  -t start_nfs-server123
ansible-playbook -i ../hosts  task_nfs.yml  --skip-tags install_nfs-server

2.include包含

[root@manager tasks]# cat restart_nginx.yml 
- name: Restart Nginx Server
  systemd:
    name: nginx
    state: restarted

[root@manager tasks]# cat a_project.yml 
- hosts: webservers
  tasks:

    - name: A Project command
      command: echo "A"

    - name: Restart nginx
      include: ./restart_nginx.yml

[root@manager tasks]# cat b_project.yml 
- hosts: webservers
  tasks:

    - name: B Project command
      command: echo "B"

    - name: Restart nginx
      include: ./restart_nginx.yml

3.错误处理 ignore_errors: yes

[root@manager tasks]# cat task_ignore.yml 
- hosts: webservers
  tasks:

        #明确知道该TASK可能会报错,及时报错也希望不影响后续的TASK任务时
    - name: Ignore False
      command: /bin/false
      ignore_errors: yes

    - name: touch new file
      file: path=/tmp/bgx_ignore state=touch


changed_when: false    --->针对shell命令
force_handlers: yes    --->强行调用handlers

4.异常处理

1.每次状态都是changed,纵使没有修改过被控端

        #Check_Redis_Status=$(netstat -lntp | grep redis) 
    - name: Check Redis Status
      shell: netstat -lntp | grep redis
      register: Check_Redis_Status
      changed_when: false

        #echo ${Check_Redis_Status}
    - name: Debug Check_Redis Variables
      debug:
        msg: "Redis Status: {{ Check_Redis_Status.stdout_lines }}" 

2.nginx推送配置文件后,没有任何的检查功能

###low版
[root@manager tasks]# cat task_nginx.yml 
- hosts: webservers
  tasks:

        #安装nginx
    - name: Installed nginx Server
      yum: 
        name: nginx
        state: present

        #配置nginx
    - name: Configure nginx Server
      template:
        src: ./file/nginx.conf.j2
        dest: /etc/nginx/nginx.conf


        #检查nginx (Check_Nginx_Status=$(nginx -t))
    - name: Check Nginx Configure File
      shell: nginx -t
      register: Check_Nginx_Status
      ignore_errors: yes
      changed_when: false

        #启动Nginx
    - name: Systemd Nginx Server
      systemd:
        name: nginx
        state: started
        enabled: yes 
      when: ( Check_Nginx_Status.rc == 0 )  #只有Check_Nginx_Status.rc=0时,才会执行启动操作
      
      
#####new版
[root@manager tasks]# cat task_nginx.yml 
- hosts: webservers
  tasks:
        #安装nginx
    - name: Installed nginx Server
      yum: 
        name: nginx
        state: present

        #配置nginx
    - name: Configure nginx Server
      template:
        src: ./file/nginx.conf.j2
        dest: /etc/nginx/nginx.conf


        #检查nginx (Check_Nginx_Status=$(nginx -t))
    - name: Check Nginx Configure File
      shell: nginx -t
      register: Check_Nginx_Status
      changed_when: 
        - Check_Nginx_Status.stdout.find('successful')
        - false
   
        #启动Nginx
    - name: Systemd Nginx Server
      systemd:
        name: nginx
        state: started
        enabled: yes
        
###new版       
[root@manager tasks]# cat task_nginx.yml 
- hosts: webservers
  tasks:
        #安装nginx
    - name: Installed nginx Server
      yum: 
        name: nginx
        state: present

        #配置nginx
    - name: Configure nginx Server
      template:
        src: ./file/nginx.conf.j2
        dest: /etc/nginx/nginx.conf


        #检查nginx (Check_Nginx_Status=$(nginx -t))
    - name: Check Nginx Configure File
      shell: nginx -t
   
        #启动Nginx
    - name: Systemd Nginx Server
      systemd:
        name: nginx
        state: started
        enabled: yes      

3.强制调用handlers 触发器

[root@manager tasks]# cat task_nginx.yml 
- hosts: webservers
  force_handlers: yes	#无论tasks失败与否,只要通过过handlers,那me一定会执行
  tasks:
        #安装nginx
    - name: Installed nginx Server
      yum: 
        name: nginx
        state: present

        #配置nginx
    - name: Configure nginx Server
      template:
        src: ./file/nginx.conf.j2
        dest: /etc/nginx/nginx.conf
      notify: Restart Nginx Server

        #检查nginx (Check_Nginx_Status=$(nginx -t))
    - name: Check Nginx Configure File
      shell: nginx -t

        #启动Nginx
    - name: Systemd Nginx Server
      systemd:
        name: nginx
        state: started
        enabled: yes 

  handlers:
    - name: Restart Nginx Server
      systemd: 
        name: nginx
        state: restarted

总结: Ansible Task 控制

• 1.判断语句 when
• 2.循环语句 with_items
• 3.触发器 handlers
• 4.标签 tag
• 5.忽略错误 ignore_errors
• 6.异常处理
  • 1.关闭TASK的changed状态 -->让该TASK一直处理OK状态 changed_when: false
  • 2.强制调用handlers: 当正常task调用过handlers,则无论后续的task成功还是失败,都会调用handlers触发器执行任务.
  • 3........ Check_Nginx_Status.stdout.find('successful')