CentOS Stream 9
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OpenSSH : Use Parallel SSH2022/01/07

 
Use PSSH (Parallel Secure Shell) to connect to multiple hosts via SSH.
[1] Install PSSH.
# install from EPEL

[root@dlp ~]#
dnf --enablerepo=epel -y install pssh
[2] Basic usage for PSSH.
This is based on the environment you set SSH key-pair to target Hosts without passphrase.
If set passphrase, run SSH-Agent and set passphrase on it first.
# specify target hosts and access via SSH

[cent@dlp ~]$
pssh -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
# possible to read hosts-list from a file

[cent@dlp ~]$
vi pssh_hosts.txt
# write a host 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] 13:34:44 [SUCCESS] cent@10.0.0.51
5.14.0-34.el9.x86_64
[2] 13:34:44 [SUCCESS] cent@10.0.0.52
5.14.0-34.el9.x86_64
[4]
PSSH package includes pscp.pssh, prsync, pslurp, pnuke commands and you can use them with the same usage of pssh.
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