Staffan Ohlsson, BLISS support group at ESRF Instrumentation Services and Development Division

Staffan Ohlsson has spent 15 years as Linux system administrator and 6 years as Beamline Support staff at ESRF. He has also worked another 12 years at CNRS and CERN with system administration support with mainframes, DEC machines and Apple computers and even Next computers and VAX/VMS and some other stuff. 

How to manage all Beamline Support software (1339 software packages, some only a few files) with on average 9 different version per product (you can get back to whatever version you like, not like "only latest" with debian8 using "apt-get") and some software with 240 versions (including up to 8 different supported operating systems: win32,win64,redhat4,redhat5, debian6, debian7 and debian8 for each supported version).