Arkansas High Performace Computing Center [hpcwiki]

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

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

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.  

==== First Step ==== 
(You may skip this if located at UA or UAMS, or using their VPNs, since those addresses are pre-registered.  Also those addresses which ARE-ON recognizes as research networks, including most university networks and Ozarks Go) 

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. After a successful login that session will be terminated and you will then be able to login to the same host with normal ssh (port 22, which is the default ssh port so does not need to be specified), and you will be forwarded to one of the pinnacle login nodes.

<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 (example ''75.205.5.185'') is registered and will remain in the allow list for the next 12 hours.  An SSH session directly to hpc-portal2.hpc.uark.edu will forward the connection to a Pinnacle login node.

==== Second Step ====

<code>
[pawel@frontdesk ~]$ ssh testuser@hpc-portal2.hpc.uark.edu 
Password: 
Last login: Tue Dec  7 16:58:20 2021 from jumpbox-dmz
pinnacle-l12:testuser:~$ 
</code>

==== SCP ====

Once you have authenticated over port 2022 of hpc-portal2.hpc.uark.edu, moving data using Secure CoPy (SCP) works exactly the same way over hpc-portal2.hpc.uark.edu as it does directly over pinnacle.uark.edu:

<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>
===== Portal access =====

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

**On-Campus**

On-campus and UAF VPN users can access this service via the URL: 

  * **''https://pinnacle-portal.uark.edu''**  


**Off-Campus (Non-research/commodity network)**

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}}
Arkansas High Performace Computing Center [hpcwiki]

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