[slurm-users] About x11 support

[Mahmood Naderan]

So, is it still possible to use spank even when the code is compiled for
x11?
It seems that Rocks uses RSA keys. It also uses hostbasedauthentication.

[root at rocks7 ~]# cd /etc/ssh/
[root at rocks7 ssh]# ls
authorized_keys  shosts.equiv  ssh_host_ecdsa_key
ssh_host_ed25519_key.pub  ssh_known_hosts
moduli           ssh_config    ssh_host_ecdsa_key.pub  ssh_host_rsa_key
RCS              sshd_config   ssh_host_ed25519_key    ssh_host_rsa_key.pub
[root at rocks7 ssh]# cd authorized_keys/
[root at rocks7 authorized_keys]# ls
id_rsa.pub

Also ssh_known_hosts contains

compute-0-5 ssh-rsa
AAAAB3NzaC1yc2EAAAADAQABAAABAQCaWf7D+NY5gl6ibFcCRAY4Rt9kbTYAsFFJ7iiMCY1sAehWSs49Vy3rUrP/+et1i9doXzq/Yh00FdwO8cRUHO14zifnDJVbLRBuLhmfZTVACms6EzIC+HhhseDCqUSV64qrp0G/bGaHr18x59HvwyHgIqfUW+lCOj7GDXP0wy/ikMSr8PwRKgreq+HdpHbYI7D5WIQzvdo6gMwjKl4Srg+9AlBTLpB78lm8mRxCAqtiDfE8+PQxfovAuyd/Y8DURCNx1FRiXjI8XCnzv8M7QnhL/dBq4QZ6hQBmzIasJ1kHt/PFmQHJQnauvFI2TEQYMUVZ6eDEbx4IWjExvUrukrul
'rocks7-cluster-key'



Does that mean everything is ok?
I wonder why the second command fails?

1)
[mahmood at rocks7 ~]$ srun --nodelist=rocks7 -n 1 -c 6 --mem=8G -A y8 -p RUBY
xclock
Warning: Missing charsets in String to FontSet conversion
which shows the xclock

2)
[mahmood at rocks7 ~]$ srun --x11 --nodelist=rocks7 -n 1 -c 6 --mem=8G -A y8
-p RUBY xclock
srun: error: Cannot forward to local display. Can only use X11 forwarding
with network displays.



>Another thing is we had to set:
>  * X11Parameters=local_xauthority

Where? sshd config file?


Regards,
Mahmood




On Fri, Nov 16, 2018 at 2:45 PM Bas van der Vlies <
bas.vandervlies at surfsara.nl> wrote:

> It is compile\d with `-x11` else you get an error message that the
> option is not supported.  As said it only supports RSA-keys (hardcoded
> in the src, libssh2 can handle more formats) and you must use short
> hostnames. Another thing is we had to set:
>   * X11Parameters=local_xauthority
>
> because we have autofs enabled home dirs.
>
> regards
>
>
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