[GE users] qlogin / ssh (ultimately, X forwarding)

rumpelkeks tina.friedrich at diamond.ac.uk
Tue Feb 2 14:40:08 GMT 2010

Hello list,

I know this was discussed numerous times. I've read the instructions and 
at least believe I found the related posts in the archives. I still 
can't get it to work. I'd appreciate some help with this.

I'm trying to set up qlogin-via-ssh because we need X forwarding, at 
least for some things.

I plan to only enable it on a couple of nodes, so I am not working on 
the queue level but node level (rather, queue instance level) config - 
as I understand things this should be possible?

Anyway, I followed these instructions:


set it up for one test node and tried to log in (and I did first check 
that qlogin works with the builtin method).

Doesn't work. What I get is "Your job XXXXX has been submitted" followed 
by "Your interactive job XXXXX as been successfully scheduled.". And 
then, after a couple of seconds each, numerous repeats of the "has been 
successfully scheduled" and in the end a commlib error and the queue 
instance ends up in an error state.

On the node, no ssh processes (no addidional ssh processes, that is) 
appear to get started. Can't find anything in any logs, either. (Oh yes, 
ssh into the nodes directly works.)

I've tried a couple of things (lots of things, actually), but now need 
some help debugging this.

I am running Red Hat Enterprise 5 everywhere. I have a feeling that one 
of my problems is that RHEL5 isn't set up to run ssh from inetd. I 
looked into that but couldn't actually get it to work. However, I wasn't 
too bothered - I don't insist on running it through inetd. Unless SGE 
insist on it? I've tried setting the daemon to not use the "-i" flag to 
sshd, or run sshd without daemonising it; but no luck.

Could someone shed some light on to what the Grid Engine is actually 
trying to do? Is it simply running the command that I enter as the 
qlogin_daemon (qrsh_daemon etc)? And if yes, what user does it run this 
as? That sort of thing.

Thanks a lot,

Tina Friedrich, Computer Systems Administrator, Diamond Light Source Ltd
Diamond House, Harwell Science and Innovation Campus - 01235 77 8442


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