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pssh
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===
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批量管理执行
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## 补充说明
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**pssh命令** 是一个python编写可以在多台服务器上执行命令的工具，同时支持拷贝文件，是同类工具中很出色的，类似pdsh，个人认为相对pdsh更为简便，使用必须在各个服务器上配置好密钥认证访问。
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### 安装pssh
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在CentOS系统环境下，介绍yum的安装和源码安装的方式：
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**yum方法**
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```
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yum install pssh
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```
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**编译安装**
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```
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wget http://parallel-ssh.googlecode.com/files/pssh-2.3.1.tar.gz
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tar xf pssh-2.3.1.tar.gz
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cd pssh-2.3.1/
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python setup.py install
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```
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### 选项
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```
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--version：查看版本
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--help：查看帮助，即此信息
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-h：主机文件列表，内容格式”[user@]host[:port]”
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-H：主机字符串，内容格式”[user@]host[:port]”
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-：登录使用的用户名
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-p：并发的线程数【可选】
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-o：输出的文件目录【可选】
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-e：错误输入文件【可选】
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-t：TIMEOUT 超时时间设置，0无限制【可选】
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-O：SSH的选项
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-v：详细模式
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-A：手动输入密码模式
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-x：额外的命令行参数使用空白符号，引号，反斜线处理
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-X：额外的命令行参数，单个参数模式，同-x
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-i：每个服务器内部处理信息输出
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-P：打印出服务器返回信息
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```
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### 实例
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获取每台服务器的uptime：
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```
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# pssh -h ip.txt -i uptime
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[1] 11:15:03 [SUCCESS] Mar.mars.he
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11:15:11 up 4 days, 16:25, 1 user, load average: 0.00, 0.00, 0.00
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[2] 11:15:03 [SUCCESS] Jan.mars.he
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11:15:12 up 3 days, 23:26, 0 users, load average: 0.00, 0.00, 0.00
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[3] 11:15:03 [SUCCESS] Feb.mars.he
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11:15:12 up 4 days, 16:26, 2 users, load average: 0.08, 0.02, 0.01
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```
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查看每台服务器上mysql复制IO/SQL线程运行状态信息：
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```
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# pssh -h IP.txt -i "/usr/local/mysql/bin/mysql -e 'show slave status \G'"|grep Running:
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Slave_IO_Running: yes
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Slave_SQL_Running: Yes
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Slave_IO_Running: Yes
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Slave_SQL_Running: Yes
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Slave_IO_Running: Yes
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Slave_SQL_Running: Yes
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```
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保存每台服务器运行的结果：
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```
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# pssh -h IP.txt -i -o /tmp/pssh/ uptime
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[1] 11:19:47 [SUCCESS] Feb.mars.he
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11:19:55 up 4 days, 16:31, 2 users, load average: 0.02, 0.03, 0.00
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[2] 11:19:47 [SUCCESS] Jan.mars.he
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11:19:56 up 3 days, 23:30, 0 users, load average: 0.01, 0.00, 0.00
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[3] 11:19:47 [SUCCESS] Mar.mars.he
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11:19:56 up 4 days, 16:30, 1 user, load average: 0.00, 0.00, 0.00
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```
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我们来看一下/tmp/pssh/下的文件及其内容
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```
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# ll /tmp/pssh/
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总用量 12
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-rw-r--r--. 1 root root 70 12月 1 11:19 Feb.mars.he
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-rw-r--r--. 1 root root 70 12月 1 11:19 Jan.mars.he
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-rw-r--r--. 1 root root 69 12月 1 11:19 Mar.mars.he
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# cat /tmp/pssh/*
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11:19:55 up 4 days, 16:31, 2 users, load average: 0.02, 0.03, 0.00
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11:19:56 up 3 days, 23:30, 0 users, load average: 0.01, 0.00, 0.00
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11:19:56 up 4 days, 16:30, 1 user, load average: 0.00, 0.00, 0.00
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```
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上面介绍的是pssh命令很少的一部分，大家可以将其用到适合自己的场景，发挥它的最大功效。
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->
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