OpenSSH : Use Parallel SSH2020/04/27

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

root@dlp:~#

apt -y install pssh

[2]	This is the basic usage for 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 from 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:

# input 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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