Difference between revisions of "BwForCluster Chemistry Login"

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(Set service password)
(Set service password)
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link "Set password" of section "JUSTUS 2" on the
link "Set password" of section "JUSTUS 2" on the
[[BwForCluster_User_Access#Personal_registration_at_bwForCluster|registration server of JUSTUS2]]
[[BwForCluster_User_Access#Personal_registration_at_bwForCluster|registration server of JUSTUS2]]
(if you have not done so already).
- if you have not done so already.
= Create TOTP keys =
= Create TOTP keys =

Revision as of 20:21, 2 July 2020

1 Set service password

Log in to JUSTUS 2 is only possible with a service password. The password of your home organization is not accepted anymore. Therefore please set a service password for JUSTUS 2 by following link "Set password" of section "JUSTUS 2" on the registration server of JUSTUS2 - if you have not done so already.

2 Create TOTP keys

For better security the log in to JUSTUS 2 requires two factors. In addition to your service password, a time-based one-time password (TOTP) is required as second factor.

To setup a TOTP for your account, please follow the instructions that are send to you by email right after registering for bwForCluster JUSTUS 2.

3 Login

Prerequisites for login:

  • You have registered your account at the registration server for JUSTUS 2 (to register log in to the registration server of JUSTUS2 and click on "Register" in section of "JUSTUS 2").
  • You have set a service password for JUSTUS 2 (to do so login at the registration server of JUSTUS2 and select "Set Password" in section "JUSTUS 2").
  • You have created a TOTP key on our authentication server and imported that key into a TOTP app on your smartphone (for details see email send by registration server right after account registration).

Thereafter you can access the bwForCluster JUSTUS 2 for Chemistry and Quantum Sciences 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 Chemistry 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.

3.1 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

3.2 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 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.

4 Further reading