[gridengine users] How to export an X11 back to the client?

William Hay w.hay at ucl.ac.uk
Tue May 12 07:15:50 UTC 2020

On Mon, May 11, 2020 at 09:39:26PM +0000, Mun Johl wrote:
> Hi William,
> Thank you for your reply.
> See my comments below.
> > -----Original Message-----
> > On Thu, May 07, 2020 at 06:29:05PM +0000, Mun Johl wrote:
> > > Hi William, et al.,
> > > I am not explicitly setting the DISPLAY--as that is how I normally use 'ssh -X'.  Nor have I done anything to open any additional ports.
> > Again, since 'ssh -X' is working for us.  As a reminder, there is no way for me to know what to set DISPLAY to even if I wanted to set it.
> > >
> > Do you invoke qrsh with -V by any chance?  I think that might cause the
> > DISPLAY from the login node to override the one set by ssh -X.  If you
> > do could you switch to using -v to transfer individual environment
> > variables instead?
> [Mun] Yes, I do use -V normally.  When I once again get to a point where qrsh is able to launch I will certain try your suggestion.  But I may tweak it by simply "unset'ing" DISPLAY from the wrapper script rather than using -v because we have many env vars that are required in order to correctly run a job.
The problem with unsetting DISPLAY is that if you do it then ssh won't
be able to forward it.  

Possibly env -u DISPLAY XDISPLAY="${DISPLAY}" qrsh -now n -V <command>
Then a wrapper around ssh as your qrsh_command
env DISPLAY="${XDISPLAY}" /usr/bin/ssh -X "$@"

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