Ansible中的任务执行控制

循环

简单循环

{{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

- name: create filehosts: host1tasks:- name: file moudleservice:name: "{{ item.name }}"state: "{{ item.state }}"loop:- name: httpdstate: started- name: vsftpdstate: stopped
~

条件

when:- 条件1- 条件2

 

 条件判断

=	        //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

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1or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。

vim userlist.yml
userlist:- name: user1id: 6666comment: user1 comment- name: user2id: 7777vim usercreate.yml
- name: create userhosts: allvars_files: ./userlist.ymltasks:- name: create user with commentuser:name: "{{item.name}}"uid: "{{item.id}}"comment: "{{item.comment}}"state: presentwhen: item.comment is definedloop:"{{userlist}}"- name: create user without commentuser:name: "{{item.name}}"uid: "{{item.id}}"state: presentwhen: item.comment is not definedloop:"{{userlist}}"

 

触发器

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

vim webs.yml
webs:- name: bbs.westos.orgdoc: /var/www/virtual/westos.org/bbs/htmlindex: "bbs.westos.org's page"- name: login.westos.orgdoc: /var/www/virtual/westos.org/login/htmlindex: "login.westos.org's page"- name: www.westos.orgdoc: /var/www/htmlindex: "www.westos.org's page"

 

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 %}

 

vim web.yml
- name: Create website index pagehosts: allvars_files: ./webs.ymltasks:- name: install httpdyum:name: httpdstate: present- name: serviceservice:name: httpdstate: startedenabled: no- name: Create index.html for each websitetemplate:src: ./html.j2dest: "/etc/httpd/conf.d/vhost.conf"notify: restart httpd- name: create directorylineinfile:path: "{{item.doc}}/index.html"line: "{{ item.index }}"create: yesloop: "{{webs}}"handlers:- name: restarted httpdservice:name: httpdstate: restarted