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SSH tunnelling: Difference between revisions
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In the context of the Alliance, SSH tunnelling is necessary in certain cases, | In the context of the Alliance, SSH tunnelling is necessary in certain cases, | ||
because compute nodes on [[Niagara]], [[Béluga]] and [[Graham]] do not have direct access to | because compute nodes on [[Niagara]], [[Béluga]] and [[Graham]] do not have direct access to | ||
the | the Internet, nor can the compute nodes be contacted directly from the Internet. | ||
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* Running commercial software on a compute node that needs to contact a license server over the | * Running commercial software on a compute node that needs to contact a license server over the Internet; | ||
* Running [[Visualization|visualization software]] on a compute node that needs to be contacted by client software on a user's local computer; | * Running [[Visualization|visualization software]] on a compute node that needs to be contacted by client software on a user's local computer; | ||
* Running a [[Jupyter | Jupyter Notebook]] on a compute node that needs to be contacted by the web browser on a user's local computer; | * Running a [[Jupyter | Jupyter Notebook]] on a compute node that needs to be contacted by the web browser on a user's local computer; | ||
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Certain commercially-licensed programs must connect to a license server machine | Certain commercially-licensed programs must connect to a license server machine | ||
somewhere on the | somewhere on the Internet via a predetermined port. If the compute node where | ||
the program is running has no access to the | the program is running has no access to the Internet, then a ''gateway server'' | ||
which does have access must be used to forward communications on that port, | which does have access must be used to forward communications on that port, | ||
from the compute node to the license server. To enable this, one must set up | from the compute node to the license server. To enable this, one must set up | ||
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There is Network Address Translation (NAT) on both Graham and Cedar allowing users to access the | There is Network Address Translation (NAT) on both Graham and Cedar allowing users to access the Internet from the compute nodes. On Graham however, access is blocked by default at the firewall. Contact [[Technical support|technical support]] if you need to have a specific port opened, supplying the IP address or range of addresses which should be allowed to use that port. | ||
== From Linux or MacOS X == <!--T:51--> | == From Linux or MacOS X == <!--T:51--> | ||