5

Is it possible to run one part of the ksh/sh script on one server then ssh to another server and continue with the rest of the script? Or is there a work-around?

I have a user with which I don't have to authenticate each time I access a server, so I can hop from one server to another without any keyboard interaction.

I've already tried this, trying to separate some logic into another script then :

MYSCRIPT="nohup ksh myscript.ksh > mylog.log &"
ssh servername ${MYSCRIPT}

I tried this but it doesn't seem to execute this script on another server.

The whole code above is part of a for loop; I execute the same script for a list of servers.

For testing purposes, the list has two servers; for some weird and twisted reason, only the last (or second) server script works as I expect.

All servers can see myscript.ksh -- it is visible and executable to all of them.

  • 2
    Perhaps post a bit more code. My test example which looks just like your code seems to work fine. – Steven D Feb 12 '11 at 3:58
  • Where is myscript.ksh? Unless it's in your home directory, you should be running myscript.ksh, not ksh myscript.ksh. – Mikel Feb 12 '11 at 20:47
  • If your routing/fw allows it, I'd rather suggest that you coordinate your remote server access from one central host without hopping around (at least, that's how I fetch my backups). – wag Feb 12 '11 at 21:13
3

It sounds like you want to run a sequence of commands on another server without having to log in multiple times. To accomplish this, you could do:

local_command sequence
ssh remote-server << End-Of-File
        remote_command 1
        remote_command 2
        remote_command 3
End-Of-File

This would run remote_command 1, and when it finishes, run remote_command 2, then remote_command 3 all on the remote server

  • I like this approach, can you please give an example, or a man page, I think this is what I want.. I want to execute entire script many lines on multiple servers – c0mrade Feb 12 '11 at 21:49
  • Gotcha – c0mrade Feb 13 '11 at 2:41
1

To be honest your wording is a bit vague but let's trace possible causes:

What you described should work just fine, but see ssh-copy-id source to look for discrepancies with your own script (it is a shell script bundled with OpenSSH).

You mentioned that the command does not work on one of your machines, maybe the server has a different setup preventing the script to start in the first place.

Also, you mentioned authentication, so I suppose you're using passwordless public key authentication, and you might want to restrict the commands authorized with the associated key: see man ssh, section AUTHORIZED_KEYS FILE FORMAT.

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