ansible 远程执行命令
更改配置文件
建立一个主机组，可以针对这一整个组去执行命令
[root@server ~]# vim /etc/ansible/hosts
[testhosts]
127.0.0.1
#192.168.56.128 //IP和域名选填一种
client.test.com
远程执行一个命令：
[root@server ~]# ansible testhosts -m command -a 'w'
192.168.56.128 | SUCCESS | rc=0 >>
23:03:41 up 13:29, 2 users, load average: 0.00, 0.00, 0.00
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/0 192.168.56.1 22:12 9:43 0.03s 0.03s -bash
root pts/1 server.test.com 23:03 0.00s 0.04s 0.00s /bin/sh -c LANG
127.0.0.1 | SUCCESS | rc=0 >>
23:03:34 up 13:28, 2 users, load average: 0.08, 0.02, 0.01
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/0 192.168.56.1 22:12 1.00s 0.49s 0.26s /usr/bin/python
root pts/3 localhost 23:03 0.00s 0.03s 0.00s /bin/sh -c LANG
[root@server ~]# ansible testhosts -m command -a 'hostname'
192.168.56.128 | SUCCESS | rc=0 >>
client
127.0.0.1 | SUCCESS | rc=0 >>
server
这样就可以批量执行命令了。这里的testhosts为主机组名，-m后边是模块名字，-a后面是命令。也可以直接写一个ip，针对某一台机器来执行命令。
[root@server ~]# ansible 192.168.56.128 -m command -a 'hostname'
192.168.56.128 | SUCCESS | rc=0 >>
client
[root@server ~]# ansible client.test.com -m command -a 'hostname'
client.test.com | SUCCESS | rc=0 >>
client
注意：有可能遇到错误："msg":"Aborting,target uses selinux but python bindings (libselinux-python) aren't installed!"
解决：yum install -y libselinx-python
还有一个模块shell同样能实现远程执行命令
[root@server ~]# ansible client.test.com -m shell -a 'hostname'
client.test.com | SUCCESS | rc=0 >>
client
command模块与shell模块的区别：
[root@server ~]# ansible client.test.com -m command -a 'cat /etc/passwd|grep root'
client.test.com | FAILED | rc=1 >>
cat: /etc/passwd|grep: 没有那个文件或目录
cat: root: 没有那个文件或目录
[root@server ~]# ansible client.test.com -m shell -a 'cat /etc/passwd|grep root'
client.test.com | SUCCESS | rc=0 >>
root:x:0:0:root:/root:/bin/bash
operator:x:11:0:operator:/root:/sbin/nologin
shell的作用是远程执行一个脚本，也能执行这种管道符式的组合命令
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