FAQ

How can I gain access to HPC clusters?

  1. Create ssh key pair. You will need the public key for the registration process.

  2. Register on https://register.sivvp.sk.

  3. Wait until you registration is approved. You will be informed by email.

  4. You can login to one of the clusters.

How do I run my calculations?

  1. In the resources section find out which queueing system runs on the cluster of your choice.

  2. Create a shell script where you specify your requirements (e.g. resources, walltime) and application you want to run.

  3. Submit the script to the queue.

Can I use more ssh keys?

Yes. Create ssh key pair and append public key to ~/.ssh/authorized_keys file on the cluster.

I forgot password from my private ssh key. What shall I do?

  1. Create new ssh key pair.

  2. Create a ticket on https://register.sivvp.sk/sk/support and add the public key as an attachment. Alternatively you can send us the public key as an email attachment to hpcregister@savba.sk.

When I run job using MPI I got this error: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).

MPI uses ssh to communicate between compute nodes. Only available authentication method is ssh key. Create an passwordless ssh key pair on the login node and add the public part to your ~/.ssh/authorized_keys file:

ssh-keygen -t rsa -b 2048
#when prompted enter no password (i.e. just press enter)

cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

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