NEMO/Login

1 Login

After registration (registration procedure at bwForCluster User Access, the bwForCluster NEMO can be accessed via a Secure Shell like ssh on Linux and Mac.

From linux machines, you can log in using

ssh <UserID>@login1.nemo.uni-freiburg.de
ssh <UserID>@login2.nemo.uni-freiburg.de

To run graphical applications, you can use the -X or -Y flag to openssh:

ssh -Y -l <UserID> login1.nemo.uni-freiburg.de
ssh -Y -l <UserID> login2.nemo.uni-freiburg.de

For better performance on slow connections you should use e.g. VNC.

1.1 Windows Systems

For Windows systems we strongly recommend to use MobaXterm instead of PuTTY or WinSCP on Windows. MobaXterm provides a built-in X11 server allowing to start GUI based software.

Start MobaXterm, fill in the following fields:

Remote name              : login.nemo.uni-freiburg.de    # or login1.nemo.uni-freiburg.de, login2.nemo.uni-freiburg.de
Specify user name        : <UserID>
Port                     : 22

After that click on 'ok'. Then a terminal will be opened and there you can enter your credentials.

1.2 About UserID / Username

<UserID> of the ssh command is a placeholder for your username at your home organization and a prefix denoting your organization. Prefixes and resulting user names are as follows:

Site	Prefix	Username
Freiburg	fr	fr_username
Heidelberg	hd	hd_username
Hohenheim	ho	ho_username
Karlsruhe	ka	ka_username
Konstanz	kn	kn_username
Mannheim	ma	ma_username
Stuttgart	st	st_username
Tübingen	tu	tu_username
Ulm	ul	ul_username

1.2.1 Example

So if your local username for the University is vwxyz1234 and you are a user from the University of Freiburg this would combine to:

 ssh -l fr_vwxyz1234 login.nemo.uni-freiburg.de

1.3 Allowed activities on login nodes

The login nodes are the access point to the compute system and its $HOME directory. The login nodes are shared with all the users of the cluster. Therefore, your activities on the login nodes are limited to primarily set up your batch jobs. Your activities may also be:

• compilation of your program code and
• short pre- and postprocessing of your batch jobs.

To guarantee usability for all the users of the bwForCluster you must not run your compute jobs on the login nodes. Compute jobs must be submitted as Batch Jobs. Any compute job running on the login nodes will be terminated without any notice. We advise users to use interactive jobs for compute and memory intensive tasks like compiling.

2 Password Reset

If you forgot your password for the bwForCluster NEMO you can set a new one on the NEMO service page. Just use the link in the bwForCluster NEMO service box.

If you have trouble resetting your password, please try to delete your password first (use button) and then reset it again. If this does not help de-register and re-register the NEMO service. Otherwise please contact the bwForCluster NEMO Support.

3 Further reading

• bwForCluster NEMO

• Scientific software is made accessible using the Environment Modules system

• Compute jobs must be submitted as Batch Jobs

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