CVMFS is a file system which mounts remote directories over HTTP. CVMFS is also by many to distribute software binaries. Once set up it provides the simplest way to access UPS product areas provided by Fermilab.
It has excellent documentation which needs no repeating here other than to link:
Do note that CERN’s cvmfs-release-latest_all.deb may choose the wrong
distribution. If so, remove, remake and edit
/etc/apt/sources.list.d/cernvm.list to use the correct distribution.
New distributions may not yet have all packages (eg, at time of
writing Ubuntu 18.04 “bionic” does not have cvmfs-config-default).
Going down to the next most recent release may work.
However, for getting access to UPS product areas, here are the salient parts:
Edit /etc/cvmfs/default.local to look something like:
# required, add more if needed. CVMFS_REPOSITORIES=larsoft.opensciencegrid.org,uboone.opensciencegrid.org,dune.opensciencegrid.org # requires, replace with actual proxy, or just "DIRECT" if none CVMFS_HTTP_PROXY="http://my.local.proxy:1234;DIRECT" # BNL Physics department users may use # CVMFS_HTTP_PROXY="http://batch3.phy.bnl.gov:3128;DIRECT" # Optional but recomended: # limit how much cache is used on your computer, units in MB CVMFS_QUOTA_LIMIT=25000 # If not set, some default is chosen (/var/lib/cvmfs/shared). # Best to put the cache on your fastest disk which has enough space. CVMFS_CACHE_BASE=/mnt/ssd/cvmfs
Read comments and change example values appropriately. Refer to CVMFS documentation for details.
Check if things work:
# cvmfs_config probe Probing /cvmfs/larsoft.opensciencegrid.org... OK Probing /cvmfs/uboone.opensciencegrid.org... OK Probing /cvmfs/dune.opensciencegrid.org... OK