![]() There is Network Address Translation (NAT) on both Graham and Cedar allowing users to access the Internet from the compute nodes. When connecting to a database server where the connection is only possible through the head node, SSH tunnelling can be used to bind an external port to the database server. This technique allows graphical output of applications like a Jupyter Notebook or visualization software to be displayed transparently on the user's local workstation even while they are running on a cluster's compute node. SSH tunnelling can also be used in our context to allow a user's computer to connect to a compute node on a cluster through an encrypted tunnel that is routed via the login node of this cluster. Ssh nia-gw -L $LOCALPORT: $REMOTEHOST: $REMOTEPORT -N -f & break done || export MLM_LICENSE_FILE = $LOCALHOSTĬonnecting to a program running on a compute node The SSH command to issue in the job script is then: You also need to choose the port number on the To pick one of the login nodes (gra-login1, 2. Graham, an alternative solution is to request a firewall exceptionįor license server LICSERVER and its specific port LICPORT. With this information, one can now set up the SSH tunnel. That server also must allow connections from the login nodes for You should obtain this information from whoever maintains the license server.
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