OpenSSH : Use Parallel SSH2020/08/17 |
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Use PSSH (Parallel Secure Shell) to connect to multiple hosts via SSH.
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| [1] | Install PSSH. |
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root@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 debian@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
debian@dlp:~$
vi pssh_hosts.txt # write hosts per line like follows debian@10.0.0.51 debian@10.0.0.52 parallel-ssh -h pssh_hosts.txt -i "uptime" [1] 19:37:59 [SUCCESS] debian@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] debian@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. |
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debian@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] debian@10.0.0.51 5.10.0-8-amd64 [2] 12:54:06 [SUCCESS] debian@10.0.0.52 5.10.0-8-amd64 |
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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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