Use Parallel SSH

Use Parallel SSH 2015/04/15

	Install Parallel SSH to connect to multiple hosts.
[1]	Install PSSH.

# install from EPEL [root@dlp ~]#  yum --enablerepo=epel -y install pssh

[2]	How to use PSSH. This is the case for key-pair authentication without passphrase. If passphrase is set in key-pair, start SSH-Agent first to automate inputting passphrase.

# connect to hosts and execute hostname command [cent@dlp ~]$  pssh -H "10.0.0.51 10.0.0.52" -i "hostname"  [1] 17:28:02 [SUCCESS] 10.0.0.51 node01.server.world [2] 17:28:02 [SUCCESS] 10.0.0.52 node02.server.world # it's possible to read host list fron a file [cent@dlp ~]$  vi pssh_hosts.txt # write hosts per line like follows cent@10.0.0.51 cent@10.0.0.52 [cent@dlp ~]$  pssh -h pssh_hosts.txt -i "uptime"  [1] 19:37:59 [SUCCESS] cent@10.0.0.52 19:37:59 up 1:35, 0 users, load average: 0.00, 0.00, 0.00 [2] 19:37:59 [SUCCESS] cent@10.0.0.51 19:37:59 up 1:35, 0 users, load average: 0.00, 0.00, 0.00

[3]	It's possible to connect with password authentication too, but it needs passwords on all hosts are the same one.

[cent@dlp ~]$  pssh -h pssh_hosts.txt -A -O PreferredAuthentications=password -i "uname -r"  Warning: do not enter your password if anyone else has superuser privileges or access to your account. Password:  # input password [1] 12:54:06 [SUCCESS] cent@10.0.0.51 2.6.32-504.12.2.el6.x86_64 [2] 12:54:06 [SUCCESS] cent@10.0.0.52 2.6.32-504.12.2.el6.x86_64

[4]	By the way, PSSH package includes pscp.pssh, prsync, pslurp, pnuke commands and you can use them with the same usage of pssh.