Logging into Hopper
Users may access Hopper via SSH remote login to the host
hopper.orc.gmu.edu with their GMU netID and password.
This method provides you with a UNIX shell session on one of Hopper's head nodes. Currently,
the GMU VPN is not required in order to access the cluster, however this is under review and may be
changed at some point.
Alternatively, users may access Hopper via a web based interface called Open OnDemand, more details on accessing Open OnDemand can be found on the wiki page: Open OnDemand on Hopper.
Connecting via SSH
To connect to Hopper use the following command from a terminal on your local system:
ssh your-gmu-user-id@hopper.orc.gmu.edu
where your-gmu-user-id is your GMU
netID.
All current, popular operating systems provide a terminal and support SSH remote login. This includes Windows, although users of Windows prior to version 10 will need to install a third-party ssh client (e.g. PuTTY.)
Once the you have entered the above command you will be prompted to authenticate by entering your GMU password. When authentication is successful you will be logged in to one of the Hopper cluster head nodes (hopper1 or hopper2). If you don't have access, please see Getting an ORC Cluster Account.
You may wish to create an ssh key-pair to provide alternative authentication, or use either of the -X or -Y (recommended) options to forward X11 data to a local X-Windows GUI. For details on how these and other advanced options work, you can visit the ssh manual page: SSH manual.
Once logged in, jobs on the cluster may be scheduled via the Slurm resource manager. The nodes themselves are not directly accessible -- all node access is controlled through Slurm.