CernLxplus

How to connect without password to lxplus

• The CERN wiki page is here
• On ubuntu, you need to:
  • install kerberos

sudo apt-get install krb5-user
with domain: CERN.CH

• Copy to /etc/krb5.conf the config file taken from CERN here.
• Do a kinit . It should ask you for you CERN password, specifying yourlogin@CERN.CH. If this is wrong, specify it yourself with kinit yourlogin@CERN.CH

This should give you a valid kerberos ticket lasting 25h, meaning you will be able to connect passwordlessly to lxplus as long as the kerberos ticket is valid.

To check if this worked, do a klist -f. Check the Flags, there should be an F, meaning you will have access to your /afs space.

• Connect to lxplus using the following ssh options (replace MYLOGIN with the CERN login):

ssh -2 -oGSSAPIAuthentication=yes -oGSSAPIDelegateCredentials=yes -oGSSAPITrustDNS=yes -l MYLOGIN lxplus.cern.ch

• From the UIs, you should simply do:

kinit
ssh -2 -oGSSAPIAuthentication=yes -oGSSAPIDelegateCredentials=yes -oGSSAPITrustDNS=yes -oStrictHostKeyChecking=no -l $USER $(nslookup lxplus.cern.ch|grep Address|sed -n 2,2p|awk -F':' '{print $2}')

How to copy data from disk (eg. beo5) to you space at lxplus?

Use secure copy: scp

 
scp  'uname'@lxpub3.iihe.ac.be:/beo5/somefile 'uname'@lxplus.cern.ch:/afs/cern.ch/user/m/me 

How to print from lxplus when you're in building 40

Command to print

 
lpr -P 40-4B-COR .... 

• List of available printers at CERN.
• More information.
• Article on printing