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:

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

  

• 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.

• 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.
• 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

• 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:$ 

The secure shell (SSH) server on hpc-portal1.hpc.uark.edu does not accept passwords as an authentication method. 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:

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

• Click on Create New SSH Key or Use Existing SSH Key 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.

• 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.
• Before the file can be used for SSH, the file permissions must be updated \ to read-only for owner (mode 400) on macOS and Linux:

cd Downloads/
chmod 400 pinnacle.key

• Use the new key to SSH into Pinnacle:

ssh -i pinnacle.key ffinfinn@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 ffinfinn
          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:ffinfinn:$