New system (valid starting from 2012)

Online GRID Validation Manual Version 3

OLD Documentation

• Summer 2010 Student report. This report describes at higher level the tool used to validate Geant4 on the GRID. It also includes a section on job monitoring (work done with IT)
• Developer Manual. Manual for the Grid Validation application that runs on the GRID (the application actually steering Geant4 application). Check this if you need to modify or extend the GRID validation application
• Manual for running. This manual contains very practical step-by-step instructions to run the application. It does not contain description of the tools, but it serves as a real practical guide.

Externals

• DIANE. This is the high level application on which our application is built on. To modify and use the Geant4 application a minimum knowledge of DIANE (for example looking at the tutorial: DIANETutorial) is needed.
• GANGA. This is the front-end used by DIANE for job definition and submission. Even if you can run the application without even knowing what GANGA is, in case of problems you will probably need to deal with it.
• CERN certification authority. Go here to get a GRID certificate. See later
• Geant4 VOMS manager. Go here to register your valid GRID certificate. See later

Results

• Geant4 9.4 December 2010 Validation Report

Getting a GRID certificate and using it

1. Get a GRID certificate at: https://ca.cern.ch
2. Registering it to Geant4 VO at: https://lcg-voms.cern.ch:8443/vo/geant4/vomrs (safari gives a lot of problems, so I suggest firefox)
3. From Firefox backup your certificate and save it in .p12 format somewhere, copy it on a .globus directory on your AFS home
4. In this directory issue the following commands (in a SLC5 or LXPLUS machine):

   openssl pkcs12 -in mycert.p12 -clcerts -nokeys -out usercert.pem 
   openssl pkcs12 -in mycert.p12 -nocerts -out userkey.pem 
   chmod 400 userkey.pem 
   chmod 444 usercert.pem

   source /afs/cern.ch/project/gd/LCG-share/newest/etc/profile.d/grid_env.sh   (to setup GRID runtime environmnet. Use the script ending in .csh for tcsh shells)
   voms-proxy-init --voms geant4   (to actually "login" on the GRID) if you get something like:
   ===========================================================================================================
   Cannot find file or dir: /afs/cern.ch/user/a/adotti/.glite/vomses 
   Enter GRID pass phrase: 
   Your identity: /DC=ch/DC=cern/OU=Organic Units/OU=Users/CN=adotti/CN=612198/CN=Andrea Dotti 
   Creating temporary proxy .......................................................................................... Done 
   Contacting voms.cern.ch:15007 [/DC=ch/DC=cern/OU=computers/CN=voms.cern.ch] "geant4" Done                    <<<<< This is the important stuff
   Creating proxy ........................................................................................................... Done 
   Your proxy is valid until Tue Apr 5 23:37:58 2011 
   ============================================================================================================

Testing with DIANE/GANGA

.gangarc

#  sets the name of the grid virtual organisation
VirtualOrganisation = geant4