OpenSSH : Use Parallel SSH2024/04/26 |
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Install Parallel SSH to connect to multiple hosts.
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| [1] | Install PSSH. |
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ubuntu@dlp:~# apt -y install pssh
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| [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. |
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# connect to hosts and execute [hostname] command ubuntu@dlp:~$ parallel-ssh -H "10.0.0.51 10.0.0.52" -i "hostname" [1] 07:50:51 [SUCCESS] 10.0.0.51 node01.srv.world [2] 07:50:51 [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 parallel-ssh -h pssh_hosts.txt -i "uptime" [1] 07:53:11 [SUCCESS] ubuntu@10.0.0.51 07:53:11 up 21 min, 2 users, load average: 0.08, 0.02, 0.01 [2] 07:53:11 [SUCCESS] ubuntu@10.0.0.52 07:53:11 up 3 min, 2 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. |
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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] 07:53:58 [SUCCESS] ubuntu@10.0.0.51 6.8.0-31-generic [2] 07:53:58 [SUCCESS] ubuntu@10.0.0.52 6.8.0-31-generic |
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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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