Ansible中的任务执行控制

循环

简单循环

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{{item}} 迭代变量名称
loop:
- value1
- value2
- ...                 //赋值列表


{{item}}        //迭代变量名称

循环散列或字典列表

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- name: create file
  hosts: host1
  tasks:
  - name: file moudle
    service:
      name: "{{ item.name }}"
      state: "{{ item.state }}"
    loop:
    - name: httpd
      state: started
    - name: vsftpd
      state: stopped
~

条件

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when:
 - 条件1
 - 条件2

条件判断

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=	        //value == "字符串",value == 数字	解释
<	        //value < 数字	
>	        //value > 数字	
<=	        //value <= 数字	
>=	        //value >= 数字	
!=	        //value != 数字	
is defined value	        //value is defined	变量存在
is not defined	            //value is not defined	变量不存在
in	            //value is in value	变量为
not in	            //value is not in value	变量不为
bool变量 为true	    value	    //value的值为true
bool变量 false	    not value	//value的值为false

多条条件组合

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when：
 条件1 and 条件2
 - 条件1
 - 条件2            //当条件1和条件2都为真

when:
 条件1 or 条件2        //满足其中一个

when: >
 条件1
 or
 条件2                //满足其中一个

创建两个用户 user1 和 user2， user1 的 UID 是 6666，注释是 user1 comment，user2 的 UID 是 7777，没有注释。

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vim userlist.yml
userlist:
  - name: user1
    id: 6666
    comment: user1 comment
  - name: user2
    id: 7777

vim usercreate.yml
- name: create user
  hosts: all
  vars_files: ./userlist.yml
  tasks:
    - name: create user with comment
      user:
        name: "{{item.name}}"
        uid: "{{item.id}}"
        comment: "{{item.comment}}"
        state: present
      when: item.comment is defined
      loop:
        "{{userlist}}"

    - name: create user without comment
      user:
        name: "{{item.name}}"
        uid: "{{item.id}}"
        state: present
      when: item.comment is not defined
      loop:
        "{{userlist}}"

触发器

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notify:         //触发器当遇到更改是触发handlers
handlers：             //触发器触发后执行的动作

在指定的服务器上部署网站，并创建一个简单的主页

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vim webs.yml
webs:
  - name: bbs.westos.org
    doc: /var/www/virtual/westos.org/bbs/html
    index: "bbs.westos.org's page"

  - name: login.westos.org
    doc: /var/www/virtual/westos.org/login/html
    index: "login.westos.org's page"

  - name: www.westos.org
    doc: /var/www/html
    index: "www.westos.org's page"

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vim html.j2
{% for web in webs %}
{% if web.name is not defined %}
<VirtualHost _default_:80>
{% elif web.name is defined %}
<VirtualHost *:80>
        ServerName {{web.name}}
{% endif %}
        DocumentRoot {{web.doc}}
</VirtualHost>
{% endfor %}

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vim web.yml
- name: Create website index page
  hosts: all
  vars_files: ./webs.yml

  tasks:
    - name: install httpd
      yum:
        name: httpd
        state: present

    - name: service
      service:
        name: httpd
        state: started
        enabled: no

    - name: Create index.html for each website
      template:
        src: ./html.j2
        dest: "/etc/httpd/conf.d/vhost.conf"
      notify: restart httpd

    - name: create directory
      lineinfile:
        path: "{{item.doc}}/index.html"
        line: "{{ item.index }}"
        create: yes
      loop: "{{webs}}"

  handlers:
    - name: restarted httpd
      service:
        name: httpd
        state: restarted