Arkansas High Performace Computing Center [hpcwiki]

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====== Off-campus Access ======





===== SSH access =====

Direct Secure Shell (SSH) access to AHPCC login nodes is only allowed from:

  - UAF campus network
  - via UAF Virtual Private Network (VPN [[https://its.uark.edu/network-access/vpn/index.php]]) connection
  - Other research organization networks, with membership determined by the Arkansas Research and Education Optical Network (ARE-ON [[https://www.areon.net/]])  


To accommodate users logging in from other locations a new access portal, ''hpc-portal2.hpc.uark.edu'', is available for any user holding an active AHPCC account.  This service, upon successful login, registers the source IP address of user's client machine and adds that IP to the list of allowed IP's allowed to pass network traffic to the AHPCC login nodes.  To use the service ssh into port 2022 of hpc-portal2.hpc.uark.edu.


<code>
[pawel@frontdesk ~]$ ssh testuser@hpc-portal2.hpc.uark.edu -p 2022
Password: 
Last login: Tue Dec  7 16:58:10 2021 from 75.205.5.185

               Arkansas High Performance Computing Center
                       off-campus access portal

===========================================================================
   https://hpc-portal2.hpc.uark.edu    <-  Open Ondemand Web Portal

   ssh hpc-portal2.hpc.uark.edu        <-  Standard AHPCC login

   Access allowed from 75.205.5.185 until Wed Dec  8 06:02:43 CST 2021
===========================================================================

Connection to hpc-portal2.hpc.uark.edu closed.
[pawel@frontdesk ~]$
</code>

At this point the source IP address ''75.205.5.185'' is registered and will remain in the allow list for the next 12 hours.  An SSH session directly to hpc-portal.uark.edu will forward the connection to a Pinnacle login node.

<code>
[pawel@frontdesk ~]$ ssh testuser@hpc-portal2.hpc.uark.edu 
Password: 
Last login: Tue Dec  7 16:58:20 2021 from jumpbox
pinnacle-l7:testuser:~$ 
</code>


===== Secure Copy (SCP) =====

<code>
pawel@frontdesk ~]$ scp data_set.tgz pwolinsk@hpc-portal2.hpc.uark.edu:
Password: 
data_set.tgz                                                                                                                                                        100%   51KB 311.2KB/s   00:00    
[pawel@frontdesk ~]$ 
</code>

===== Open Ondemand Portal Access =====
The other popular method for accessing AHPCC resources is the Open Ondemand portal.


Others (off-campus) can access the Open Ondemand portal, by registering the client machine source IP, as described above.  Once registered, the URL below, forwards the connection to the Open Ondemand portal.

  * **''https://hpc-portal2.hpc.uark.edu''**
 



{{wiki:ood-portal.png}}