In order to obtain access to the cluster you need to do two things: firstly, you need to register your account for cluster usage and secondly you need to set up a Secure Shell (
ssh) connection. On this page the first part is described, details about SSH connections can be found here.
You log in on the cluster with your ZIMT user ID (formerly called “g-number”) and password, provided cluster usage is enabled for your ID as described below. You can also change the password of your ZIMT ID via the cluster.
Note: Since May 2020, access with your password is only possible from inside the university network or Uni VPN. More details here.
Obtaining access: employees
University employees can request cluster access themselves. To do that you need to do the following:
- Log in to the Nutzerkontenverwaltung with your ZIMT ID.
- Click on “Meine Optionen”.
- Select the option “Ressourcen zum Wissenschaftlichen Rechnen (OMNI)” via the Button “Jetzt buchen”.
- Your application will normally be processed within a few days. You will receive an email “Welcome to the Cluster” which will give further details.
Obtaining access: students
Students can only use the cluster if they have an employee as a supervisor. That supervisor has to have cluster access already. Cluster access for students is limited to one year, but may be extended an arbitrary number of times and at any point, by one year each. The extension can also be performed by a different employee than the supervisor.
Adding a student as a supervisor
As a supervisor, you can add access for your students yourself in the Nutzerkontenverwaltung (Unisim). You only need the student’s e-mail address.
To add a student, you need to do the following:
- Log into the Nutzerkontenverwaltung using your own ZIMT ID.
- On the left-hand side, click on “Meine Optionen”.
- At the bottom of the “Meine Optionen” page you can find “Freigabe von ggf. kostenpflichtigen Optionen für Dritte” (unlocking paid and unpaid options for another person).
- Select “Ressourcen zum Wissenschaftlichen Rechnen (OMNI) für Studenten/Mitarbeiter” via the button “Zur Eingabe”.
- On the next screen, add one or more students or employees using their e-mail addresses
- The requests will then be processed. The student(s) will get their welcome e-mail, which also contains the cluster access information, as soon as their account is ready. This happens usually within a day.
- You can see your students in the Nutzerkonteverwaltung and you can also extend their access from there. Remember that extensions are always for one year.
Prolonging a student as a supervisor
Prolongation of a student works analogously to adding a student. After adding the student again, the account gains access to the cluster for an other 12 month. Student’s data is untouched by this process.
Changing your password
Caution: if you change your password on the cluster, the change will apply to all other services linked to this user account as well (e.g. Moodle, Webmail, eduroam, …). The password can also be changed using this link.
You can change your password in Linux with the command
If you enter
passwd, you will first be asked for your current password. Once this has been entered correctly, you can enter the new password. You will then have to type it a second time to confirm it.
$ passwd Ändern Passwort für Benutzer <user>. Aktuelles Passwort: Geben Sie ein neues Passwort ein: Geben Sie das neue Passwort erneut ein: passwd: alle Authentifizierungs-Merkmale erfolgreich aktualisiert.
Note: The password will not be shown in the command line as you enter it, not even as stars.