Ubuntu 14.04
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Use Parallel SSH2015/12/23

 
Install Parallel SSH to connect to multiple hosts.
[1] Install PSSH.
root@dlp:~#
apt-get -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

ubuntu@dlp:~$
parallel-ssh -H "10.0.0.51 10.0.0.52" -i "hostname"

[1] 17:28:02 [SUCCESS] 10.0.0.51
node01.srv.world
[2] 17:28:02 [SUCCESS] 10.0.0.52
node02.srv.world
# it's possible to read host list fron a file

ubuntu@dlp:~$
vi pssh_hosts.txt
# write hosts per line like follows

ubuntu@10.0.0.51
ubuntu@10.0.0.52
ubuntu@dlp:~$
parallel-ssh -h pssh_hosts.txt -i "uptime"

[1] 19:37:59 [SUCCESS] ubuntu@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] ubuntu@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.
ubuntu@dlp:~$
parallel-ssh -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:    
# password

[1] 12:54:06 [SUCCESS] ubuntu@10.0.0.51
2.6.32-504.12.2.el6.x86_64
[2] 12:54:06 [SUCCESS] ubuntu@10.0.0.52
2.6.32-504.12.2.el6.x86_64
[4]
By the way, PSSH package includes parallel-scp, parallel-rsync, parallel-slurp, parallel-nuke commands and you can use them with the same usage of pssh.
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