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Accepted
K.Wanter
Asked: 2018-01-03 17:23:06 +0800 CST

How automatically ssh to cluster servers and run command there to get some information?

  • 772

A simple question, say I want to ssh to cluster machines and monitor some info of each of them. Specifically, I want to run nvidia-smi on each of them to know the GPU usage of them. I tried:

for host in machine1 machine2 machine3
 do 
    ssh "$host" 
    nvidia-smi 
 done

but it only logs in to machine1, then just stopped there. Only after I exit machine1, will nvidia-smi execute, but on the local terminal, not on machine1. Then it logs in to machine2 and stops there...

ssh

1 Answers

  1. Best Answer

    Put the command you want to execute on the ssh line: 

    for host in machine1 machine2 machine3
 do 
        ssh "$host" nvidia-smi 
 done

    You might need to specify the full path of nvidia-smi.

    Also, rather than hard-coding your list of servers into this script (and other, similar scripts), keep the list in a file:

    cat >Servers.txt <<EOF
machine1
machine2
machine3
EOF

    And change the for line to: 

    for host in $(cat Servers.txt)

    Then, when the "list of servers" changes, you only have to change ONE place, not every script.

    • 2