/
Access with SSH

Access with SSH

SSH Authentication

For the authentication, you can

  • use password-based or ssh-key-based authentication as a user from Paderborn University.

    • We recommend ssh-key-based authentication with password-protected ssh-keys.

  • As an external user, you can only use ssh-key-based authentication due to security considerations.

System-Specific Access

All systems have a jump host which provides load balancing across the front end nodes of a cluster.

Noctua 2

The Jump-Host for Noctua 2 is fe.noctua2.pc2.uni-paderborn.de. Port 22 (SSH).

Interactive Sessions

We recommend the following combined command for an interactive session (replace USERNAME with your lowercase username):

ssh -t USERNAME@fe.noctua2.pc2.uni-paderborn.de ssh noctua2

Alternatively, you can put

Host noctua2 HostName fe.noctua2.pc2.uni-paderborn.de User [USERNAME] RequestTTY force IdentityFile [PATH TO PRIVATE KEY] IdentitiesOnly yes RemoteCommand ssh noctua2

in your ~/.ssh/config and replace [USERNAME] with your username on Noctua and [PATH TO PRIVATE KEY] with the path to your private key of your ssh-key. Then you can use the short command ssh noctua2 to connect to Noctua 2. You will be asked for the password of your ssh-key when logging in instead of your user password.

If you want to connect to the last connected frontend, then use this command:

ssh -t USERNAME@fe.noctua2.pc2.uni-paderborn.de ssh noctua2-last

If you need to a run graphical application, the -X option should be used, which enables X11 forwarding with X11 SECURITY extension. The complete command is

ssh -X -t USERNAME@fe.noctua2.pc2.uni-paderborn.de ssh -X noctua2

Otus

The Jump-Host for Otus is fe.otus.pc2.uni-paderborn.de. Port 22 (SSH).

Interactive Sessions

We recommend the following combined command for an interactive session (replace USERNAME with your lowercase username):

ssh -t USERNAME@fe.otus.pc2.uni-paderborn.de ssh otus

Alternatively, you can put

Host otus HostName fe.otus.pc2.uni-paderborn.de User [USERNAME] RequestTTY force IdentityFile [PATH TO PRIVATE KEY] IdentitiesOnly yes RemoteCommand ssh otus

in your ~/.ssh/config and replace [USERNAME] with your username on Otus and [PATH TO PRIVATE KEY] with the path to your private key of your ssh-key. Then you can use the short command ssh otus to connect to Otus. You will be asked for the password of your ssh-key when logging in instead of your user password.

If you want to connect to the last connected frontend, then use this command:

ssh -t USERNAME@fe.otus.pc2.uni-paderborn.de ssh otus-last

If you need to a run graphical application, the -X option should be used, which enables X11 forwarding with X11 SECURITY extension. The complete command is

ssh -X -t USERNAME@fe.otus.pc2.uni-paderborn.de ssh -X otus