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Hoffman2 Cluster through a Login Node

Login Node Address

The address of the Hoffman2 Cluster is:

hoffman2.idre.ucla.edu

Normally you would use this address to connect to the Hoffman2 Cluster login nodes. In order to spread the load more evenly, there are several login nodes, which for most purposes can be used interchangeably. Each time you login you will be randomly assigned to one of the login nodes. The name of the login node you are using will appear in your shell prompt, unless you have changed the default prompt. Example:

[login_id@login4 ~]$

If for some reason you need to login to a specific login node, their addresses are:

login2.hoffman2.idre.ucla.edu
login3.hoffman2.idre.ucla.edu
login4.hoffman2.idre.ucla.edu

One or more of the login nodes may not be available at any giving time. Your userid is limited to 16 login sessions per login node.

Login Node Fingerprints

When you connect to a Hoffman2 Cluster login node for the first time, you may 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

Data Transfer Node, loni node Fingerprints

When you connect to the Hoffman2 Cluster dtn2 or loni node for the first time, accept the connection only if the fingerprint you see is one of the following:

RSA fingerprint
28:58:b8:01:e5:26:9f:27:6f:d3:03:60:d6:b0:d9:7c
RSA bubblebabble
xefar-timed-mopaf-zibum-cekur-cybul-ryluc-fadop-suhes-voger-taxix

 

DSA fingerprint
01:88:5f:af:e6:01:12:95:a2:36:97:62:96:ef:ed:a3
DSA bubblebabble
xuhev-vogop-pykun-vonyv-ryken-bamur-vafyk-kykyr-hodek-kynez-zyxox

 

key fingerprint
f1:e2:e6:bb:07:3f:b3:cc:33:85:4d:4b:81:42:ef:2d
key bubblebabble
xudah-zesah-musyp-dysat-mifim-feceb-tunyc-fykun-folin-nylen-soxox

NX public key

The NX client public key for the Hoffman2 Cluster is available on the Hoffman2 login nodes in this file:

/etc/nxserver/client.id_dsa.key

Use this key when you are configuring a local nx client, such as those available from NoMachine. See a for information on installing, configuring and using the NoMachine NX Client for access to the Hoffman2 Cluster.

You can use an scp client on your local machine to obtain a copy of this key. For example:

scp login_id@hoffman2.idre.ucla.edu:/etc/nxserver/client.id_dsa.key  .

or, you can use a local ssh client:

ssh login_id@hoffman2.idre.ucla.edu  cat /etc/nxserver/client.id_dsa.key

NEW KEY December 1, 2011. There is a new key for the new nxserver that was installed along with CentOS 6. If your NX client is configured with the old key, you will need to reconfigure it in order to connect to Hoffman2.

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