Comments on: Send Remote Commands Via SSH

By: Tim

Tim — Wed, 30 Jul 2008 22:00:00 +0000

With openssh you can set a ConnectTimeout…
ssh -o ConnectTimeout=8 blah blah

Timeout is in seconds.

By: systemsboy

systemsboy — Tue, 01 Jul 2008 23:53:00 +0000

Razi,

The end of the command should not log you out of the Terminal. It should only log you out of the machine you're SSHing to. If you don't want to log out of that machine, there's not really any reason to use this method. Just SSH into the machine and run your command(s). Then log out when you're good and ready.

Or, to answer your question more directly, I don't know of a way to do this, but I don't really know why you'd need to either.

-systemsboy

By: Razi

Razi — Fri, 27 Jun 2008 05:22:00 +0000

How do I accomplish the same task but after I terminate the command, I want to remain logged into the terminal?

By: systemsboy

systemsboy — Wed, 23 Jan 2008 20:51:00 +0000

Yup. Nothing like a good ol' for loop. You could do similar with a simple list of computer names:
for computer in `cat computers.txt`; do ssh -t user@$computer.domain 'ls /Applications'; done

Love it!

-systemsboy

By: kernalpanx

kernalpanx — Wed, 23 Jan 2008 20:42:00 +0000

when u have more then one server to do that too…… with a good naming convention you can laways use the for command
for i in 1 2 3 4 5 6 7 8 9 10 11 ; do ssh admin@fileserver$i.domain.com ‘date’ ‘cd / ; du -sh /* ; done

etc etc

By: linux_newbie8478

linux_newbie8478 — Thu, 06 Dec 2007 01:29:00 +0000

Hi,

I'm writing a small python script, which should ssh to 5 diff boxes and get the result for uptime from each box. I want to run this as a daemon process so that I know the least loaded box at any time.

This can be easily done using a simple for loop around -
load = str(commands.getoutput("ssh " + machine[0]+ " uptime"))

But the problem arises when 1 of the 5 remote machines is down. The script just waits for a response from that machine and does not move on to the next box

How do I instruct the ssh cmd to timeout after say 1 min?

This can be achieved using a Timer thread in the python script, but it would be much easier if ssh had a switch for the same.

Unfortunately I can't locate anything in the man pages for ssh

BTW I'm using -
$ ssh -V
OpenSSH_3.6.1p2, SSH protocols 1.5/2.0, OpenSSL 0x0090701f
$

Thanks for your help

By: systemsboy

systemsboy — Tue, 14 Nov 2006 18:08:00 +0000

Ashley,

Excellent! Thank you!

-systemboy

By: ashley

ashley — Tue, 14 Nov 2006 18:05:00 +0000

Here you have some info about how to set up the ssh connection using keys with restrictions:

command="/path/to/ilium/rdistd -S" NNNN MM 89012[bulk still gone for the sake of example]34567 priam@sparta

so that only a certain command be called while using this key. very neat.

By: systemsboy

systemsboy — Fri, 21 Jul 2006 23:10:00 +0000

Ach! Nein! I can't read those pages! (Well, most of them anyway.)

I'm glad I'm not the only one who was unaware of this SSH superpower. Maybe it's just one of those things everyone already knows. But man is it handy!

-systemsboy

By: matx

matx — Fri, 21 Jul 2006 21:24:00 +0000

I think I found the origin of that info that “Rambo” sourced. It’s half in German and half in English, but all good stuff.

http://www.akadia.com/services/unix_tools.html