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CERN IT-ES. MW clients in CVMFS (ATLAS perspective). Simone Campana (on behalf of many). Desired Scenario. MW clients are installed in CVMFS Each release on a dedicated path With a setup.sh script on that path Sites can install clients locally or use CVMFS ones

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mw clients in cvmfs atlas perspective
CERN IT-ES

MW clients in CVMFS(ATLAS perspective)

Simone Campana (on behalf of many)

desired scenario
Desired Scenario
  • MW clients are installed in CVMFS
    • Each release on a dedicated path
    • With a setup.sh script on that path
  • Sites can install clients locally or use CVMFS ones
    • The setup.shscript should overrule the existing configuration
  • Panda will instruct the pilot about which setup to source
    • Global configuration, with the possibility to overwrite per queue and per job
  • This would allow flexibility in commissioning new clients and deploy rapidly bug fixes

Simone Campana – Nov 2012 GDB

some more details
Some More Details
  • “MW Clients” on the WN means
    • The Data Management stuff
    • VOMS clients
  • 32 vs 64 bits
    • The default should be using 64 bits
    • We need also 32 bits libraries (for Athena)
    • Having both in LD_LIBRARY_PATH should be enough
  • Python version
    • Multiple python versions of clients should be in CVMFS (2.6,2.7 .. will be reduced)
    • setup.sh should allow an argument to specify the python version to use

Simone Campana – Nov 2012 GDB

what has been done
What has been done
  • ATLAS installed MW clients in CVMFS (ATLAS RootBase)
  • Stop-gap solution to simplify the EMI-2 testing
    • Build a tarball from RPMs
      • http://walkerr.web.cern.ch/walkerr/emi_maketar.sh
    • Unpack in CVMFS
    • Add the setup scripts for the environment
  • Tried in UK, several iterations needed. Finally got to work
    • A thread of 53 emails, with 10 people
      • Rod Waker (tarball builder)
      • Asoka Da Silva (installation and configuration in CVMFS)
      • A. DeSalvo (ATLAS Grid SW installation)
      • UK site managers (particularly Cambridge), Alessandra and Wahid
    • And this to configure ATLAS only…

Simone Campana – Nov 2012 GDB

conclusions
Conclusions
  • This is not just about making a tarballwith rpm2cpio
    • The configuration is the hard part
    • And whichever solution needs to be maintained
  • We should discuss
    • If we need this
    • Who can participate to the effort and how
  • ATLAS can offer some effort and an infrastructure for commissioning/testing
    • through Panda+HammerCloud
  • ATLAS does not have the right expertise nor manpower for client release management and configuration
    • So can not commit to WLCG for maintaining MW clients in CVMFS

Simone Campana – Nov 2012 GDB

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