Host Details of the CERN IT CVMFS Service

Hostgroup cvmfs

This cluster contains 2 node types:

cvmfs/lxcvmfs

These are typically hosts with name lxcvmfsXX. They are nodes where maintainers of software in cvmfs login to install their releases and publish these releases. There is exactly one node for each repo, e.g atlas, cms which corresponds to each of the cvmfs repositories. For all such hosts there is a DNS alias in landb e.g. cvmfs-atlas.cern.ch -> lxcvmfs37

cvmfs/one/backend

The one backend node is the backend of the stratum one service that pulls from the stratum 0 service.

cvmfs/one/frontend

These are multiple reverse squid proxies that serve data as the cvmfs-stratum-one.cern.ch public endpoint. They pull files on demand from the backed of stratum one service.

cvmfs/zero

These are the simple stratum 0 webservers that serve data from the netapp. Only the stratum ones at T1s connect to this service.

Houystgroup ourproxy

These are not detailed below, the proxy nodes are the normal forward proxies that are used by CERN batch workers, as such they are not part of the central CvmfFS service. They are all in the ourproxy hostgroup.

Installation, the short version is there is a script for each in the it-cvmfs git repository.