[Tutor] SSH commands in Python on Linux

Bernard Lebel 3dbernard at gmail.com
Thu Aug 11 15:18:31 CEST 2005


Ok thanks everyone for the recommandations, I'll check them out.


Bernard


On 8/11/05, Jesse Noller <jnoller at gmail.com> wrote:
> On 8/10/05, Bernard Lebel <3dbernard at gmail.com> wrote:
> > Hello,
> >
> > I'm trying to make a script to send a SSH command from a Linux
> > computer to another Linux compter.
> >
> > The Python syntax I'm using...
> >
> >
> > import os
> > os.system( 'ssh root at 192.168.10.204 "ls"' )
> >
> >
> > Now the problem is that I'm always asked for the password. So my
> > question is two-fold:
> >
> > 1- Is there a way to not be asked for the root password?
> > 2- If not, then is it possible to feed the SSH password input with my
> > Python script? I have about stdin redirection, but I have to admit
> > that I'm a bit lost and I don't know if it applies to SSH input as
> > well.
> >
> > Right now I'm using the ls command to list processes, however
> > ultimately I want to be able to kill some processes within a loop
> > (this is for render farm management).
> >
> >
> >
> > Thanks
> > Bernard
> 
> Some of the things you are going to be bit by you've already ran into
> - the first of which is authentication.
> 
> I would recommend looking at the following utilities:
> 
> http://www.theether.org/pssh/
> http://sourceforge.net/projects/pyssh
> 
> Setting up private/public key authentication is going to allow for a
> greate amount of secure automation. Barring that, use the pexpect
> module to do the prompt handling, pexpect is bad simply due to the
> fact you'll need to store your passwords plaintext within your program
> which is a seriously risk.
> 
> Also note you'll need to take into account basic flow control for
> Stdin, Stdout and Stderr - you need to watch for hosts that are not
> found/don't exist and ssh commands that may or may not hang.
> 
> The PSSH program has excellent work arounds for all of these within it.
> 
> -jesse
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