HowTo EOS

Currently CERN EOS is mounted on the User Interface machines t3ui01-03:

$ ls /eos

home-a  home-c  home-e  home-g  home-i  home-k  home-m  home-o  home-q  home-s  home-u  home-w  home-y  project
home-b  home-d  home-f  home-h  home-j  home-l  home-n  home-p  home-r  home-t  home-v  home-x  home-z  user

to get access to your EOS data, you first need to get a CERN kerberos ticket using the kinit command, which will ask you for your CERN password.

$ kinit cern_username@CERN.CH

Password for cern_username@CERN.CH:********** 

You will now have a kerberos ticket allowing access to CERN services. You can list the ticket and information about it using klist:

 klist

Ticket cache: FILE:/t3home/feichtinger/krb5cc_xyz
Default principal: dfeich@CERN.CH

Valid starting       Expires              Service principal
07.09.2023 17:50:39  08.09.2023 18:50:34  krbtgt/CERN.CH@CERN.CH
        renew until 14.09.2023 17:50:34

To mount EOS, you now just have to issue the following command

$ eosfusebind -g krb5 $HOME/krb5cc_$UID

Now you should be able to see your files by listing your EOS mounted dir, e.g. for me

ls /eos/home-d/dfeich

Please observe that EOS is not designed for high perfomance file access over the wide area network to CERN. You should not do intensive IO to EOS from the Tier-3.