The port number of the license service (here LICPORT).The IP address or the name of the license server (here LICSERVER).In most cases, creating an SSH tunnel in a batch job requires only two or Such an arrangement is also called port forwarding. To enable this, one must set upĪn SSH tunnel. Which does have access must be used to forward communications on that port,įrom the compute node to the license server. The program is running has no access to the internet, then a gateway server Somewhere on the internet via a predetermined port. List of TCP and UDP port numbers for more.Ĭertain commercially-licensed programs must connect to a license server machine Many port numbers are reserved, by rule or by convention, for You can think of it as loosely analogous to a radio frequency While not strictly required to use SSH tunnelling, you may wish to be familiar with SSH key pairs.Ĭontacting a license server from a compute nodeĪ port is a number used to distinguish streams of communicationįrom one another. In the other cases, the server is on the compute node but theĬhallenge is to connect to it from the outside. The compute cluster and is rarely under a user's control, whereas In the first case, the license server is outside of Connecting to the Cedar database server from somewhere other than the Cedar head node, e.g., your desktop.Running a Jupyter Notebook on a compute node that needs to be contacted by the web browser on a user's local computer.Running visualization software on a compute node that needs to be contacted by client software on a user's local computer. ![]() Running commercial software on a compute node that needs to contact a license server over the internet. ![]() The following use cases require SSH tunnels: The internet, nor can the compute nodes be contacted directly from the internet. In the context of Compute Canada, SSH tunnelling is necessary in certain cases,īecause compute nodes on Niagara, Béluga and Graham do not have direct access to SSH tunnelling is a method to use a gateway computer to connect two
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