On Fri, 7 Sep 2012, Michael Gutteridge wrote:
On Fri, Sep 7, 2012 at 7:18 PM, Evren Yurtesen IB <[email protected]> wrote:
It appears it is enough to set X11UseLocalhost=no on login node only.
Now the question is, how secure is this? :) or what is the downside?
It's not terribly secure. Basically you're allowing X11 clients to
connect from any host.
I realized the nodes still require access to .Xauthority file
otherwise they get authorization errors. So it appears people without
access to .Xauthority file can not connect anyway?
As Aaron indicates, Slurm doesn't do X forwarding. The DISPLAY
variable you're getting in the interactive session is from the
environment on your login node.
srun.x11 works by creating a screen session via an ssh connection to
the node. We have been working with a X11 spank plugin- so far so
good. There seem to be a few forks on github- IIRC, we started with
the contribution from here:
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&ved=0CDgQFjAC&url=http%3A%2F%2Fgroups.google.com%2Fgroup%2Fslurm-devel%2Fbrowse_thread%2Fthread%2F8a4f7eedacf8d476%2Fccf84be0a5e4b57a&ei=t9JKUP_kC8eLiwL04YD4Dw&usg=AFQjCNGSkQcT-C9fzlVSVnC-AGAxGHbneg
I tried spank plugin from:
https://github.com/edf-hpc/slurm-spank-x11
and there seems to be a bug.
The plugin seems to make every node to read /tmp/slurm-spank-x11.* files
even when --x11=first is used. This is causing errors to be printed if
execution uses 2 or more nodes. Dont you have this problem also? Any
solutions?
-bash-4.1$ srun --x11=first -N 2 ./mandel/pmandel
srun: job 23859 queued and waiting for resources
srun: job 23859 has been allocated resources
error: unable to open file /tmp/slurm-spank-x11.23859.0
slurmd[node2]: error: x11: unable to read DISPLAY value
Drawing region -rmin -2.00000000000000000 -imin -2.00000000000000000 -rmax
2.00000000000000000 -imax 2.00000000000000000 max. iters:1000
Ready for zoom rectangle (single mouse click to quit)
Press <Return> to close window
-bash-4.1$
Thanks,
Evren
On Fri, 7 Sep 2012, Aaron Knister wrote:
Hi Evren,
I'm not sure if --pry plays a significant role here. The DISPLAY variable,
by default, is set to localhost:port_offset. SLURM itself doesn't do any x11
forwarding so when your remote application attempts to connect to the x11
server on the submission node, unless they're the same, the connection will
fail. The solution is to set X11UseLocalhost to no in your sshd_config's on
your clusters nodes, restart sshd and login again.
Sent from my iPhone
On Sep 7, 2012, at 6:36 PM, Evren Yurtesen IB <[email protected]> wrote:
Hello,
I am trying to run programs with graphical output using slurm.
I tried srun's --pty option to start a shell. Everything looks fine and
DISPLAY variable is set, yet programs are not able to connect to the
DISPLAY. I get error stating failed to connect to localhost:11.0 from node1
Then I tried using P. Anderssons scripts and they seem to work fine:
https://computing.llnl.gov/linux/slurm/faq.html#terminal
So, am I understanding correctly that --pty option should allow X11
forwarding? Is there a trick to get it working?
Thanks,
Evren
--
Hey! Somebody punched the foley guy!
- Crow, MST3K ep. 508
