Arkansas High Performace Computing Center [hpcwiki]

The secure shell (SSH) server on hpc-portal1.hpc.uark.edu does not accept passwords as an authentication method for the SSH protocol. Instead SSH key files are used for access. A public SSH key file is stored in your account on Pinnacle. You must supply a matching private key (pinnacle.key) file as a parameter to the ssh command on the client to log in.

ssh -i pinnacle.key ffinfinn@hpc-portal1.hpc.uark.edu

Both private and public keys are generated and configured automatically on Pinnacle via the web portal. To enable SSH password-less access:

1. log into the web portal at: https://hpc-portal1.hpc.uark.edu
2. In the top menu go to Clusters→SSH keys

   

3. Click on Create New SSH Key or Use Existing SSH Key button if available. Both buttons will redirect your browser to a file manager window allowing you to download your private SSH key pinnacle.key file to your client device.

1. Click on the checkbox next to the pinnacle.key file and press the Download button at the top. The file will likely be saved to your Downloads directory.
2. Before the file can be used for SSH, the file permissions have to be updated to “read only for owner”, or mode “400” on MacOS and Linux devices

Pawels-MacBook-Pro-2:~ pawel$ cd Downloads/
Pawels-MacBook-Pro-2:Downloads pawel$ chmod 400 pinnacle.key

1. Use our new key to SSH into Pinnacle

 
Pawels-MacBook-Pro-2:Downloads pawel$ ssh -i pinnacle.key ffinffin@hpc-portal1.hpc.uark.edu

  ************ PLEASE CITE US in your publications *****************************
  **    This research is supported by the Arkansas High Performance Computing **
  **    Center which is funded through multiple National Science Foundation   **
  **    grants and the Arkansas Economic Development Commission.              **
  ******************************************************************************
      
  Login nodes are for file operations and job submission.  
  All login nodes run a different kernel than compute nodes, so:
    - Don't compile on login nodes. Resulting code won't work on compute nodes. 
    - Don't run R or Python on login nodes.  

  For a shared cloud compute node:
     srun -N1 -n1 -c1 -p cloud72 -q cloud -t 72:00:00 --pty /bin/bash 


Last login: Fri Apr 10 10:14:51 2026 from 167.224.131.232

      Pinnacle file system usage for dchaffin
          Filesystem                Usage/Quota               Files/Quota
              /scrfs               4.059T/10TB             21798831/10.0 million
               /scr1                  16k/ 1TB                    4/ 2.5 million
               /scr2                  96k/ 1TB                   24/ 2.5 million


pinnacle-l11:ffinffin:$