==== SSH Password-less Login ====

The secure shell (SSH) server on **hpc-portal2.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. A matching private key (pinnacle.key) file has to be supplied as a parameter to the ssh command on the client to log in.

<code>
ssh -i pinnacle.key ffinfinn@hpc-portal2.hpc.uark.edu
</code>

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-portal2.hpc.uark.edu

**2.** In the top menu go to **Clusters -> SSH keys**

{{:hpc-portal1-auth5.png?400|SSH keys menu}}

**3.** 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.

{{:hpc-portal1-auth6.png?400|SSH key download}}

**4.** 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.

**5.** Before you can use the file for SSH, the file permissions must be updated
to read-only for owner, mode ''400'' on MacOS and Linux:

<code>
cd Downloads/
chmod 400 pinnacle.key
</code>

**6.** Use the new key to SSH into Pinnacle:

<code>
ssh -i pinnacle.key ffinfinn@hpc-portal2.hpc.uark.edu

  ************ PLEASE CITE AHPCC ********** 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.  
    - Don't run R or Python on login nodes.  
  To start an interactive job on 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:$
</code>