1、先决条件：安装pssh工具要求python版本大于2.4即可。
安装pssh工具的主机针对远程主机需要配置免秘钥认证：
ssh-keygen -t rsa
ssh-copy-id [remotehost]
2、下载pssh工具安装介质：
https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/parallel-ssh/pssh-2.3.1.tar.gz
3、安装pssh：
tar -zxvf pssh-2.3.1.tar.gz
cd pssh-2.3.1
python setup.py install
安装完成后默认生成5个linux命令：
Parallel ssh (pssh)
Parallel scp (pscp)
Parallel rsync (prsync)
Parallel nuke (pnuke)
Parallel slurp (pslurp)
4、pssh使用案例讲解：
1）pssh使用案例：
pssh --help可以查看命令帮助文档。
$ pssh --help
Usage: pssh [OPTIONS] command [...]
Options:
--version show program's version number and exit
--help show this help message and exit
-h HOST_FILE, --hosts=HOST_FILE
hosts file (each line "[user@]host[:port]")
-H HOST_STRING, --host=HOST_STRING
additional host entries ("[user@]host[:port]")
-l USER, --user=USER username (OPTIONAL)
-p PAR, --par=PAR max number of parallel threads (OPTIONAL)
-o OUTDIR, --outdir=OUTDIR
output directory for stdout files (OPTIONAL)
-e ERRDIR, --errdir=ERRDIR
output directory for stderr files (OPTIONAL)
-t TIMEOUT, --timeout=TIMEOUT
timeout (secs) (0 = no timeout) per host (OPTIONAL)
-O OPTION, --option=OPTION
SSH option (OPTIONAL)
-v, --verbose turn on warning and diagnostic messages (OPTIONAL)
-A, --askpass Ask for a password (OPTIONAL)
-x ARGS, --extra-args=ARGS
Extra command-line arguments, with processing for
spaces, quotes, and backslashes
-X ARG, --extra-arg=ARG
Extra command-line argument
-i, --inline inline aggregated output and error for each server
--inline-stdout inline standard output for each server
-I, --send-input read from standard input and send as input to ssh
-P, --print print output as we get it
1）pssh简单案例：
$ pssh -H hadoop@db02 -P date
db02: Thu Oct 5 23:56:25 CST 2017
[1] 23:56:25 [SUCCESS] hadoop@db02
$ pssh -H hadoop@db02 -i date
[1] 23:56:30 [SUCCESS] hadoop@db02
Thu Oct 5 23:56:30 CST 2017
2）批量查看远程服务器负载：
more remotehosts
db01
db02
db03
db04
$ pssh -i -O "StrictHostKeyChecking=no" -h remotehosts "uptime"
[1] 00:29:42 [SUCCESS] db02
00:29:42 up 1 day, 12:33, 3 users, load average: 0.03, 0.02, 0.10
[2] 00:29:42 [SUCCESS] db01
00:29:42 up 1 day, 12:33, 4 users, load average: 0.02, 0.02, 0.05
[3] 00:29:42 [SUCCESS] db03
16:27:00 up 1 day, 12:32, 1 user, load average: 0.00, 0.01, 0.05
[4] 00:29:42 [SUCCESS] db04
16:27:00 up 1 day, 12:32, 0 users, load average: 0.01, 0.02, 0.05
pssh通过tar命令解压远程主机文件：
pssh -i -h remotehosts "sudo "tar -zxvf /root/pssh-2.3.1.tar.gz -C /root/""
pssh -i -h remotehosts "sudo "ls -l /root/""
pssh -i -h remotehosts "rm -rf pssh-2.3.1"
pssh批量启停远程服务器服务：
pssh -i -h remotehosts "sudo "service ntpd restart""
pssh -i -h remotehosts "sudo "service ntpd status""
2）pscp使用案例：
pscp -h remotehosts /mnt/pssh-2.3.1.tar.gz /tmp/
pscp -h remotehosts -r /mnt/pssh-2.3.1 /tmp/
3）pslurp使用案例：
pslurp -h remotehosts -L /home/hadoop/ /tmp/pssh-2.3.1.tar.gz pssh.tar
pslurp -h remotehosts -r -L /home/hadoop/ /tmp/pssh-2.3.1 pssh
$ll
total 4
drwxrwxr-x 3 hadoop hadoop 34 Oct 5 23:21 db01
drwxrwxr-x 3 hadoop hadoop 34 Oct 5 23:21 db02
drwxrwxr-x 3 hadoop hadoop 34 Oct 5 23:21 db03
drwxrwxr-x 3 hadoop hadoop 34 Oct 5 23:21 db04
4）prsync使用案例：
prsync -h remotehosts -l hadoop -a -r /mnt/software/php-5.6.22 /tmp/
prsync -h remotehosts -l hadoop -az -r /mnt/software/httpd-2.2.31 /tmp/
5）pnuke使用案例：
pnuke -h remotehosts "ntpd"