[slurm-users] X11 forwarding issues

Barbara Krašovec barbara.krasovec at ijs.si
Tue Nov 17 07:05:39 UTC 2020 

Hello,

check sshd settings (here are ours):

X11Forwarding yes

X11DisplayOffset 10

*X11UseLocalhost no*

Add PrologFlags in slurm.conf:

PrologFlags=x11


Cheers,
Barbara

On 11/16/20 7:20 PM, Russell Jones wrote:
> Here's some debug logs from the compute node after launching an 
> interactive shell with the x11 flag. I see it show X11 forwarding 
> established, then it ends with a connection timeout.
>
>
> [2020-11-16T12:12:34.097] debug:  Checking credential with 492 bytes 
> of sig data
> [2020-11-16T12:12:34.098] _run_prolog: run job script took usec=1284
> [2020-11-16T12:12:34.098] _run_prolog: prolog with lock for job 30873 
> ran for 0 seconds
> [2020-11-16T12:12:34.111] debug:  AcctGatherEnergy NONE plugin loaded
> [2020-11-16T12:12:34.112] debug:  AcctGatherProfile NONE plugin loaded
> [2020-11-16T12:12:34.113] debug:  AcctGatherInterconnect NONE plugin 
> loaded
> [2020-11-16T12:12:34.114] debug:  AcctGatherFilesystem NONE plugin loaded
> [2020-11-16T12:12:34.115] debug:  switch NONE plugin loaded
> [2020-11-16T12:12:34.116] debug:  init: Gres GPU plugin loaded
> [2020-11-16T12:12:34.116] [30873.extern] debug:  Job accounting gather 
> LINUX plugin loaded
> [2020-11-16T12:12:34.117] [30873.extern] debug:  cont_id hasn't been 
> set yet not running poll
> [2020-11-16T12:12:34.117] [30873.extern] debug:  Message thread 
> started pid = 18771
> [2020-11-16T12:12:34.119] [30873.extern] debug:  task NONE plugin loaded
> [2020-11-16T12:12:34.120] [30873.extern] Munge credential signature 
> plugin loaded
> [2020-11-16T12:12:34.121] [30873.extern] debug:  job_container none 
> plugin loaded
> [2020-11-16T12:12:34.121] [30873.extern] debug:  spank: opening plugin 
> stack /apps/slurm/cluster/20.02.0/etc/plugstack.conf
> [2020-11-16T12:12:34.121] [30873.extern] debug:  X11Parameters: (null)
> [2020-11-16T12:12:34.133] [30873.extern] X11 forwarding established on 
> DISPLAY=cluster-cn02.domain:66.0
> [2020-11-16T12:12:34.133] [30873.extern] debug:  jag_common_poll_data: 
> Task 0 pid 18775 ave_freq = 4023000 mem size/max 6750208/6750208 vmem 
> size/max 147521536/147521536, disk read size/max (7200/7200), disk 
> write size/max (374/374), time 0.000000(0+0) Energy tot/max 0/0 
> TotPower 0 MaxPower 0 MinPower 0
> [2020-11-16T12:12:34.133] [30873.extern] debug:  x11 forwarding local 
> display is 66
> [2020-11-16T12:12:34.133] [30873.extern] debug:  x11 forwarding local 
> xauthority is /tmp/.Xauthority-MkU8aA
> [2020-11-16T12:12:34.202] launch task 30873.0 request from UID:1368 
> GID:512 HOST:172.21.150.10 PORT:4795
> [2020-11-16T12:12:34.202] debug:  Checking credential with 492 bytes 
> of sig data
> [2020-11-16T12:12:34.202] [30873.extern] debug:  Handling 
> REQUEST_X11_DISPLAY
> [2020-11-16T12:12:34.202] [30873.extern] debug:  Leaving 
> _handle_get_x11_display
> [2020-11-16T12:12:34.202] debug:  Leaving stepd_get_x11_display
> [2020-11-16T12:12:34.202] debug:  Waiting for job 30873's prolog to 
> complete
> [2020-11-16T12:12:34.202] debug:  Finished wait for job 30873's prolog 
> to complete
> [2020-11-16T12:12:34.213] debug:  AcctGatherEnergy NONE plugin loaded
> [2020-11-16T12:12:34.214] debug:  AcctGatherProfile NONE plugin loaded
> [2020-11-16T12:12:34.214] debug:  AcctGatherInterconnect NONE plugin 
> loaded
> [2020-11-16T12:12:34.214] debug:  AcctGatherFilesystem NONE plugin loaded
> [2020-11-16T12:12:34.215] debug:  switch NONE plugin loaded
> [2020-11-16T12:12:34.215] debug:  init: Gres GPU plugin loaded
> [2020-11-16T12:12:34.216] [30873.0] debug:  Job accounting gather 
> LINUX plugin loaded
> [2020-11-16T12:12:34.216] [30873.0] debug:  cont_id hasn't been set 
> yet not running poll
> [2020-11-16T12:12:34.216] [30873.0] debug:  Message thread started pid 
> = 18781
> [2020-11-16T12:12:34.216] debug:  task_p_slurmd_reserve_resources: 30873 0
> [2020-11-16T12:12:34.217] [30873.0] debug:  task NONE plugin loaded
> [2020-11-16T12:12:34.217] [30873.0] Munge credential signature plugin 
> loaded
> [2020-11-16T12:12:34.217] [30873.0] debug:  job_container none plugin 
> loaded
> [2020-11-16T12:12:34.217] [30873.0] debug:  mpi type = pmix
> [2020-11-16T12:12:34.244] [30873.0] debug:  spank: opening plugin 
> stack /apps/slurm/cluster/20.02.0/etc/plugstack.conf
> [2020-11-16T12:12:34.244] [30873.0] debug:  mpi type = pmix
> [2020-11-16T12:12:34.244] [30873.0] debug:  (null) [0] mpi_pmix.c:153 
> [p_mpi_hook_slurmstepd_prefork] mpi/pmix: start
> [2020-11-16T12:12:34.244] [30873.0] debug:  mpi/pmix: setup sockets
> [2020-11-16T12:12:34.273] [30873.0] debug:  cluster-cn02 [0] 
> pmixp_client_v2.c:69 [_errhandler_reg_callbk] mpi/pmix: Error handler 
> registration callback is called with status=0, ref=0
> [2020-11-16T12:12:34.273] [30873.0] debug:  cluster-cn02 [0] 
> pmixp_client.c:697 [pmixp_libpmix_job_set] mpi/pmix: task initialization
> [2020-11-16T12:12:34.273] [30873.0] debug:  cluster-cn02 [0] 
> pmixp_agent.c:229 [_agent_thread] mpi/pmix: Start agent thread
> [2020-11-16T12:12:34.273] [30873.0] debug:  cluster-cn02 [0] 
> pmixp_agent.c:330 [pmixp_agent_start] mpi/pmix: agent thread started: 
> tid = 70366934331824
> [2020-11-16T12:12:34.273] [30873.0] debug:  cluster-cn02 [0] 
> pmixp_agent.c:335 [pmixp_agent_start] mpi/pmix: timer thread started: 
> tid = 70366933283248
> [2020-11-16T12:12:34.273] [30873.0] debug:  cluster-cn02 [0] 
> pmixp_agent.c:267 [_pmix_timer_thread] mpi/pmix: Start timer thread
> [2020-11-16T12:12:34.273] [30873.0] debug:    stdin uses a pty object
> [2020-11-16T12:12:34.274] [30873.0] debug:  init pty size 34:159
> [2020-11-16T12:12:34.274] [30873.0] in _window_manager
> [2020-11-16T12:12:34.274] [30873.0] debug level = 2
> [2020-11-16T12:12:34.274] [30873.0] debug:  IO handler started pid=18781
> [2020-11-16T12:12:34.275] [30873.0] starting 1 tasks
> [2020-11-16T12:12:34.276] [30873.0] task 0 (18801) started 
> 2020-11-16T12:12:34
> [2020-11-16T12:12:34.276] [30873.0] debug:  task_p_pre_launch_priv: 
> 30873.0
> [2020-11-16T12:12:34.288] [30873.0] debug:  jag_common_poll_data: Task 
> 0 pid 18801 ave_freq = 4023000 mem size/max 9961472/9961472 vmem 
> size/max 512557056/512557056, disk read size/max (0/0), disk write 
> size/max (0/0), time 0.000000(0+0) Energy tot/max 0/0 TotPower 0 
> MaxPower 0 MinPower 0
> [2020-11-16T12:12:34.288] [30873.0] debug:  Sending launch resp rc=0
> [2020-11-16T12:12:34.288] [30873.0] debug:  mpi type = pmix
> [2020-11-16T12:12:34.288] [30873.0] debug:  cluster-cn02 [0] 
> mpi_pmix.c:180 [p_mpi_hook_slurmstepd_task] mpi/pmix: Patch 
> environment for task 0
> [2020-11-16T12:12:34.289] [30873.0] debug:  task_p_pre_launch: 
> 30873.0, task 0
> [2020-11-16T12:12:39.475] [30873.extern] error: _x11_socket_read: 
> slurm_open_msg_conn: Connection timed out
>
> On Mon, Nov 16, 2020 at 11:50 AM Russell Jones <arjones85 at gmail.com 
> <mailto:arjones85 at gmail.com>> wrote:
>
>     Hello,
>
>     Thanks for the reply!
>
>     We are using Slurm 20.02.0.
>
>     On Mon, Nov 16, 2020 at 10:59 AM sathish
>     <sathish.sathishkumar at gmail.com
>     <mailto:sathish.sathishkumar at gmail.com>> wrote:
>
>         Hi Russell Jones,
>
>         I believe you are using a slurm version older than 19.05.  X11
>         forwarding code has been revamped and it works as expected
>         starting from the 19.05.0 version.
>
>
>         On Mon, Nov 16, 2020 at 10:02 PM Russell Jones
>         <arjones85 at gmail.com <mailto:arjones85 at gmail.com>> wrote:
>
>             Hi all,
>
>             Hoping I can get pointed in the right direction here.
>
>             I have X11 forwarding enabled in Slurm, however I cannot
>             seem to get it working properly. It works when I test with
>             "ssh -Y" to the compute node from the login node, however
>             when I try through Slurm the Display variable looks very
>             different, and I get an error. Example below:
>
>             [user at cluster-1 ~]$ ssh -Y cluster-cn02
>             Last login: Mon Nov 16 10:09:18 2020 from 172.21.150.10
>             -bash-4.2$ env | grep -i display
>             DISPLAY=172.21.150.102:10.0
>             -bash-4.2$ xclock
>             Warning: Missing charsets in String to FontSet conversion
>             ** Clock pops up and works **
>
>             [user at cluster-1 ~]$ srun -p cluster -w cluster-cn02 --x11
>             --pty bash -l
>             bash-4.2$ env | grep -i display
>             DISPLAY=localhost:28.0
>             bash-4.2$ xclock
>             Error: Can't open display: localhost:28.0
>
>
>             Any ideas on where to begin looking? I'm not sure why the
>             display variable is being set to localhost instead of the
>             login node.
>
>             Thanks!
>
>
>
>         -- 
>         Regards.....
>         Sathish
>
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