[CentOS] SSH Remote Execution - su?
Chris Geldenhuis
chris.gelden at iafrica.com
Thu Mar 4 05:48:07 UTC 2010
Tim Nelson wrote:
>
>
> Tim Nelson
> Systems/Network Support
> Rockbochs Inc.
> (218)727-4332 x105
>
> ----- "Jeremy Rosengren" <jeremy.rosengren at gmail.com> wrote:
> >
> > On Wed, Mar 3, 2010 at 3:36 PM, James Hogarth
> <james.hogarth at gmail.com <mailto:james.hogarth at gmail.com>> wrote:
> >
>
> > On 3 March 2010 21:20, Tim Nelson <tnelson at rockbochs.com
> <mailto:tnelson at rockbochs.com>> wrote:
> > > Greetings All-
> > >
> > > I'm about to embark on some remote management testing and need
> a way to login to a remote system running CentOS 4.x/5.x via SSH,
> su to root (using a password), then execute a command.
> > >
> > > I currently login to the boxes using key based SSH like this:
> > >
> > > ssh -i ~/remote_key admin@$REMOTEIP
> > >
> > > Then, I SU to root. However, if I try to do this automatically
> like this:
> > >
> > > ssh -i ~/remote_key admin@$REMOTEIP 'su -l'
> > >
> > > I'm getting:
> > >
> > > "standard in must be a tty"
> > >
> > > So, how am I able to remote login using SSH, su to root, then
> execute a command as root?
> > >
> > > All comments and suggestions welcome. Thanks!
> > >
> > > --Tim
> > > _______________________________________________
> > > CentOS mailing list
> > > CentOS at centos.org <mailto:CentOS at centos.org>
> > > http://lists.centos.org/mailman/listinfo/centos
> > >
> >
> >
> Best off configuring sudo for that user (with no password) and make
> > sure that user has !requiretty in the sudoers configuration.
> >
> > James
> >
> > _______________________________________________
> > CentOS mailing list
> > CentOS at centos.org <mailto:CentOS at centos.org>
> > http://lists.centos.org/mailman/listinfo/centos
>
>
> >
> Does "ssh -t" help?
>
> YESS. It prevents the tty error from showing up and asks me for a
> password as expected. BUT, how do I then automate the entering of the
> password?
>
> John Kennedy mentioned using expect which I've used before but found
> it to be 'finnicky'. I may have to look at it again...
>
> Changing settings such as sudo configuration or ssh config may be
> daunting since I have a large number of systems(150+) that would need
> to be modified. :-/
>
> --Tim
> ------------------------------------------------------------------------
>
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>
I found that Python expect is far more logical and understandable for
complex tasks than the expect command.
ChrisG
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