Computational Cluster Programs

Using the Hoffman2 Cluster from the Head Node

The preferred way to access the Hoffman2 Cluster is through the UCLA Grid Portal at http://grid.ucla.edu. The grid portal makes the Hoffman2 Cluster accessible from any web browser. It provides you with a unified interface to the Hoffman2 Cluster and other clusters at UCLA. If you are going to use the Hoffman2 Cluster from the UCLA Grid Portal, you will not need to know any of the information presented here.

Head Node Address

The address of the Hoffman2 Cluster is:

hoffman2.idre.ucla.edu

Normally you would use this address to log into the Hoffman2 Cluster head node. In actuallity, in order to spread the load more evenly, there are two physical head nodes, which for most purposes can be used interchangeably. Each time you login you will be randomly assigned to one of the physical head nodes. (Unless you change the default shell prompt, the name of the actual head node you are using will appear in the prompt.) If for some reason you need to login to a specific head node their addresses are:

  • login1.hoffman2.idre.ucla.edu
  • login2.hoffman2.idre.ucla.edu.

Hoffman2 Cluster Head Node Fingerprint

When you ssh to the Hoffman2 Cluster for the first time, you will see a message similar to the following:

The authenticity of host 'hoffman2.idre.ucla.edu' can't be established.
RSA key fingerprint is 3c:9c:67:d8:c5:a4:ae:77:07:5f:10:2f:20:4a:75:0f.
Are you sure you want to continue connecting (yes/no)?
Accept the connection only if the fingerprint you see is one of the following:
RSA fingerprint
3c:9c:67:d8:c5:a4:ae:77:07:5f:10:2f:20:4a:75:0f
RSA bubblebabble
xotov-buget-sigyv-gozac-derel-dabaz-ryfep-tohyl-pacoc-pukot-zoxex
DSA fingerprint
09:43:5d:54:01:67:f0:ee:6e:be:20:e3:d4:ec:45:ac
DSA bubblebabble
xuher-gizaf-kedap-labif-mihiz-silys-hosih-hefez-pagiz-baguk-zexux
key fingerprint
e5:75:a2:e8:07:a4:52:c4:c1:10:40:bd:bc:55:ed:3a
key bubblebabble
xocen-pufiz-folal-haruf-bahid-fusyg-cihon-merul-mecyn-laton-poxix

Information Required to use the Hoffman2 Cluster from its Head Node

You will need to know the information presented below, to use the Hoffman2 Cluster from its head node.