JUSTUS2/Login
Login
After registration (registration procedure at bwForCluster User Access, the bwForCluster JUSTUS 2 can be accessed via ssh. Only the secure shell ssh is allowed for login.
From Linux machines, you can log in using
ssh <UserID>@justus2.uni-ulm.de
To run graphical applications, you can use the -X flag to openssh:
ssh -X <UserID>@justus2.uni-ulm.de
For better performance on slow connections you should use e.g. VNC.
The bwForCluster JUSTUS 2 in Ulm has four dedicated login nodes. The selection of the login node is done automatically. If you are logging in multiple times, different sessions might run on different login nodes.
The names of the four login nodes are justus2-login01.rz.uni-ulm.de, justus2-login03.rz.uni-ulm.de, justus2-login02.rz.uni-ulm.de, justus2-login04.rz.uni-ulm.de.
These names can be used to access a specific one of the login nodes. In general, you should use justus2.uni-ulm.de to allow us to balance the load over the four login nodes.
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 |
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 users of the system 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 may be terminated without any notice.
Further reading
- Scientific software is made accessible using the Environment Modules system
- Compute jobs must be submitted as Batch Jobs
- Jobs needing disk space will need to request it in their job script. See Batch Jobs - bwForCluster Chemistry Features
- What hardware is available is described in Hardware and Architecture