前沿：

   在一些个特定环境下，用ansible做集群管理还是很棒的，这两天看了他的模块，官方提供了很多，就算不够，你也可以自定义定制。 话说我挺喜欢他的modules模块的，够直接 ！！！  

我这里就说些常见的ansible的modules吧。

最近爬虫TAI牛逼，标记下原文地址，blog.xiaorui.cc

下面的ansible service一看大家就懂了，就是服务状态的管理模块

[root@devops-ruifengyun ~ ]ansible web -m service -a "name=nginx state=started"
10.150.145.53 | success >> {
    "changed": false,
    "name": "nginx",
    "state": "started"
}
[root@devops-ruifengyun ~ ]

紧接着我们想知道他是否真的启动了，调用command模块，用来执行系统的命令。 lsof -i :80   返回值告诉我们，nginx已经ok了。

ansible web -m command -a “你要推送的命令”

[root@devops-ruifengyun ~ ]ansible web -a "lsof -i :80" 
10.150.145.53 | success | rc=0 。。
COMMAND   PID  USER   FD   TYPE    DEVICE SIZE/OFF NODE NAME
nginx   17996  root    6u  IPv4 130868107      0t0  TCP *:http (LISTEN)
nginx   18030 nginx    6u  IPv4 130868107      0t0  TCP *:http (LISTEN)
nginx   18031 nginx    6u  IPv4 130868107      0t0  TCP *:http (LISTEN)
nginx   18032 nginx    6u  IPv4 130868107      0t0  TCP *:http (LISTEN)
nginx   18033 nginx    6u  IPv4 130868107      0t0  TCP *:http (LISTEN)
[root@devops-ruifengyun ~ ]

但是貌似command模块不识别管道，这个有点郁闷。

Run cmd
command:
*  variables like $HOME and operations like "<", ">", "|", and "&" will not work in command.
ansible lamp -m command -a 'iptables -nL'

不信可以试试！标记下原文地址，blog.xiaorui.cc

[root@devops-ruifengyun ansible ]$ ansible web -m command -a "ps aux|grep nginx"
10.150.145.53 | FAILED | rc=1 。。
ERROR: Unsupported option (BSD syntax)
********* simple selection *********  ********* selection by list *********
-A all processes                      -C by command name
-N negate selection                   -G by real group ID (supports names)
-a all w/ tty except session leaders  -U by real user ID (supports names)
-d all except session leaders         -g by session OR by effective group name
-e all processes                      -p by process ID
T  all processes on this terminal     -s processes in the sessions given
a  all w/ tty, including other users  -t by tty
g  OBSOLETE -- DO NOT USE             -u by effective user ID (supports names)
r  only running processes             U  processes for specified users

除了自己写模块外，还可以调用shell、raw模块来解决这个问题

[root@devops-ruifengyun ansible ]$ ansible web -m shell -a "ps aux|grep nginx"
10.150.145.53 | success | rc=0 ..
root     14526  0.0  0.0 106088  1144 ?        S    10:04   0:00 /bin/sh -c ps aux|grep nginx
root     14528  0.0  0.0 103240   844 ?        S    10:04   0:00 grep nginx
root     17996  0.0  0.2  99424  4752 ?        Ss   May14   0:00 nginx: master process nginx
nginx    18030  0.5  0.3 103436  7228 ?        S    May14  14:41 nginx: worker process
nginx    18031  0.5  0.3 103916  7284 ?        S    May14  14:50 nginx: worker process
nginx    18032  0.5  0.3 103436  7240 ?        S    May14  14:49 nginx: worker process
nginx    18033  0.5  0.3 104140  7328 ?        S    May14  14:54 nginx: worker process

关于ping模块，其实这个没啥讲解的。。。

[root@devops-ruifengyun ~ ]$ ansible web -m ping
10.150.145.53 | success 。。 {
    "changed": false,
    "ping": "pong"
}

关于业务的redis的模块

标记下原文地址，blog.xiaorui.cc

[root@devops-ruifengyun ~ ]$ ansible web -m redis -a "command=flush flush_mode=all"
10.150.145.53 | success  {
    "changed": true,
    "flushed": true
}

官方给的一些例子还是很全面的。

# Set local redis instance to be slave of melee.island on port 6377
- redis: command=slave master_host=melee.island master_port=6377
# Deactivate slave mode
- redis: command=slave slave_mode=master
# Flush all the redis db
- redis: command=flush flush_mode=all
# Flush only one db in a redis instance
- redis: command=flush db=1 flush_mode=db
# Configure local redis to have 10000 max clients
- redis: command=config name=maxclients value=10000
# Configure local redis to have lua time limit of 100 ms
- redis: command=config name=lua-time-limit value=100

再来搞噶ansible cron计划任务模块的使用 !

在l.yaml里面加入

tasks:
- cron: name="check dirs" hour="5,2" job="ls -alh > /dev/null"
- name: create {{ user }} on web                             
  user: name="{{ user }}"

如果咱们想看下 一个模块的使用方法，需要调用ansible-doc的命令。

[root@devops-ruifengyun ansible ]$ ansible-doc ping
> PING
  A trivial test module, this module always returns `pong' on
  successful contact. It does not make sense in playbooks, but it is
  useful from `/usr/bin/ansible'
Example:
ansible webservers -m ping

在这里有大量的模块，大家可以好好看看，当然ansible也是可以自己开发模块的。   他的写法和saltstack有些相像。。。。

这是ansible官方的modules模块index地址： (里面有很多很多的模块)

http://docs.ansible.com/modules.html

一会会做相关的补充

#添加一个用户，shell环境指定到/bin/bash 
- user: name=james shell=/bin/bash groups=admins,developers append=yes
# 删除一个用户
- user: name=johnd state=absent remove=yes
# 创建ssh key
- user: name=jsmith generate_ssh_key=yes ssh_key_bits=2048

# 开启路由转发的功能
- sysctl: name="net.ipv4.ip_forward" value=1 sysctl_set=yes

#下载
- name: download foo.conf
  get_url: url=http://xiaorui.cc/path/file.conf dest=/etc/foo.conf mode=0440