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Connection

Interface machines (UIs) are available to enable users to connect to MUST:

  • lappui.in2p3.fr for LAPP users
  • lapthui.in2p3.fr for LAPTh users
  • lappusmb.in2p3.fr for all other users

These addresses can be suffixed by 7 or 9 to select the operating system version. Examples: lappui9.in2p3.fr, lappui7.in2p3.fr or lappusmb7.in2p3.fr

You will have to connect to these machines in order to prepare and submit your jobs.

They are very similar to the computing nodes and enable you to test your code before running it widely.

Technical characteristics

  • Operating System: Linux Entreprise Linux (7/9) - 64 bits
  • Languages: Python, C/C++, Fortran
  • Libraries: Blas, Lapack
  • Specific libraries: OPENMPI (parallel computation), NVIDIA CUDA (for GPUs)

In case you need any other compiler and/or library, please send an e-mail to MUST support team

Direct SSH connection

To login to the machines in command line mode, please run from any Linux/Mac terminal: 

$ ssh <user_name>@<ui_server>.in2p3.fr

On Windows, we can recommand you mRemoteNG or MobaXterm.

Connection with graphical interface

X2Go is not available anymore on Entreprise Linux 9

If you need to display charts on UIs or run the graphical version of a software like Matlab for example, please use RDP client

There is be two possibility to access the graphical environment when you not on site (LAPP / LAPTh) :

  • VPN : reserved to LAPP / LAPTh user
  • SSH : via port forwarding.

To connect, you will need an RDP client :

  • Windows : there is an integrated client, but if you want to use SSH Tunneling we recomand you to use MobaXterm.
  • Linux : we recommend you Remmina that has the advantage to be able to easily configure SSH tunneling.
  • MacOS : Microsoft Remote Desktop

To setup port tunneling on MacOS, you will need to run this command (don't exit the command until your RDP sesssion is closed):

ssh -N -L 33389:localhost:3389 <user_name>@<ui_server>.in2p3.fr

To connect, with RDP client, you will have to use this address : localhost:33389

In case of problems

Problem with direct SSH connection

If you cannot connect anymore to an UI with a message like the following:

  @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
  @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
  @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
  IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
  Someone could be eavesdropping on you right now (man-in-the-middle attack)!
  It is also possible that a host key has just been changed.
  The fingerprint for the ECDSA key sent by the remote host is
  SHA256:<encrypted chain>.
  Please contact your system administrator.
  Add correct host key in /home/<user_name>/.ssh/known_hosts to get rid of this message.
  Offending ECDSA key in /home/<user_name>/.ssh/known_hosts:2
  ECDSA host key for <UI>.in2p3.fr has changed and you have requested strict checking.
  Host key verification failed.

please run the 2 following commands:

> ssh-keygen -R <UI>
>
> ssh-keygen -R <UI>.in2p3.fr