智一面gtalent之Ansible playbook复用

在之前写playbook的过程中，我们发现，写多个playbook没有办法，一键执行，这样我们还要单个playbook挨个去执行，很笨。所以在playbook中有一个功能，叫做include用来动态调用task任务列表。

# 0.编写脚本使用（笨办法）
[root@m01 ~]# cat lnmp.sh 
#! /bin/bash
ansible-playbook lnmp.yml  &&\
ansible-playbook lnmp1.yml &&\
ansible-playbook lnmp2.yml &&\
ansible-playbook lnmp3.yml &&\
ansible-playbook lnmp4.yml &&\
ansible-playbook lnmp5.yml

1.NFS机器上安装nginx --原来的方法 （单复用）

# 1.创建目录
[root@m01 ~ ]# mkdir nginx
# 2.编写安装nginx.yml文件
[root@m01 nginx]# cat nginx.yml  
- hosts: nfs_group
  tasks:
    - name: install nginx server
      yum:
        name: nginx
        state: present
# 3.编写启动start.yml文件
[root@m01 nginx]# cat start.yml 
- hosts: nfs_group
  tasks: 
    - name: start nginx server
      systemd:
        name: nginx
        state: started
        enabled: yes
# 4.验证并查看nginx.yml文件
[root@m01 nginx]# ll
total 8
-rw-r--r-- 1 root root 115 May  8 11:59 nginx.yml
-rw-r--r-- 1 root root 161 May  7 12:05 start.yml
[root@m01 nginx]# ansible-playbook --syntax-check nginx.yml 

playbook: nginx.yml
[root@m01 nginx]# ansible-playbook --syntax-check start.yml 

playbook: start.yml
# 5.运行nginx.yml文件
[root@m01 nginx]# ansible-playbook nginx.yml 
[root@m01 nginx]# ansible-playbook start.yml 

 2.playbook复用的配置

# 1、编辑两个剧本
[root@m01 nginx]# cat nginx.yml  
    - name: install nginx server
      yum:
        name: nginx
        state: present
  
[root@m01 nginx]# cat statr.yml 
    - name: start nginx server
      systemd:
        name: nginx
        state: started
        enabled: yes

# 2、编写复用剧本的文件
[root@m01 ~]# vim main.yml
- hosts: nfs_group
  tasks:
    - include_tasks: /root/nginx/nginx.yml
    - include_tasks: /root/nginx/stare.yml
    
 # 剧本复用：
    就是上面的剧本从name开始，下面直接调用即可,单独使用就不允许。

3.直接复用写好的palybook文件

[root@m01 ~]# cat main.yml 
- import_playbook: ./lnmp.yml
- import_playbook: ./lnmp1.yml
- import_playbook: ./lnmp2.yml
- import_playbook: ./lnmp3.yml
- import_playbook: ./lnmp4.yml
- import_playbook: ./lnmp5.yml

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

[root@m01 ~]# cat main.yml 
...
- hosts: nfs_group
  tasks:
    - name: Check Httpd Server
      #使用命令检查服务启动状态时，如果服务没有启动则会得到错误结果，剧本会停止运行
      command: systemctl is-active httpd
      #配置忽略错误可以继续执行剧本
      ignore_errors: yes
      register: check_httpd

    - name: debug outprint
      debug: 
        msg: "{{ check_httpd }}"

    - name: Httpd Restart
      service:
        name: httpd
        state: restarted
      when: check_httpd.rc == 0
      ...

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...

[root@m01 ~]# cat handler.yml 
- hosts: web_group
  vars:
    - http_port: 8012
  force_handlers: yes
  tasks:
    - name: config httpd server
      template:
        src: ./httpd.j2
        dest: /etc/httpd/conf
      notify: 
        - Restart Httpd Server
        - Restart PHP Server

    - name: Install Http Server
      yum:
        name: htttpd
        state: present

    - name: start httpd server
      service:
        name:httpd
        state: started
        enabled: yes

  handlers:
    - name: Restart Httpd Server
      systemd:
        name: httpd
        state: restarted

    - name: Restart PHP Server
      systemd:
        name: php-fpm
        state: restarted

被管理主机没有发生变化，可以使用参数将change状态改为ok
    - name: Check php Install Status
      shell: "rpm -qa | grep php | wc -l"
      register: get_php_instll_status
      changed_when: false