wiki:Doc/gLite/CernVM-FS

Version 1 (modified by Victor Mendoza, 13 years ago) (diff)

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CernVM-FS

Table of Contents

  1. Dependencies
  2. Repositories
  3. Cache Location
  4. Cache Quota
  5. Local Proxies
  6. Stratum 1 Mirror Servers
  7. Configuration
  8. VO specificities
  9. Cleanup Script
  10. Links

Dependencies

fuse: file system in user space utilities are required

Repositories

The repositories to be used can be defined with the following variable, but mind the ​dependencies: 

variable CVMFS_REPOSITORIES ?= list(
    'alice.cern.ch',
    'atlas.cern.ch',
    'atlas-condb.cern.ch',
    'cms.cern.ch',
    'lhcb.cern.ch',
    'sft.cern.ch',
);

Cache Location

The local cache is by default at /var/cache/cvmfs2, it can be relocated, e.g.: 

variable CVMFS_CACHE_BASE ?= '/var/scratch/cvmfs';

Cache Quota

The client cache is limited to less than 32768 files by default. A per repository quota can added, e.g.: 

variable CVMFS_QUOTA_LIMIT ?= 10000;

Local Proxies

The use of a local proxy is highly recommended. This variable is undefined by default and must be configured according to your location, e.g.: 

variable CVMFS_HTTP_PROXY ?= 'http://SQUID_FQDN_01:3128;http://SQUID_FQDN_02:3128';

Stratum 1 Mirror Servers

Stratum 1 mirror servers should be sorted according to your location, this can be done by defining the variable: 

variable CVMFS_SERVER_URL_CERN ?= nlist(
    'URL-01-CERN', 'http://cvmfs-stratum-one.cern.ch:8000/opt/@org@',
    'URL-02-UK', 'http://cernvmfs.gridpp.rl.ac.uk:8000/opt/@org@',
    'URL-03-BNL', 'http://cvmfs.racf.bnl.gov:8000/opt/@org@',
);

Configuration

The configuration is done by: 

include {'features/cvmfs/config'};

All the above variables can be safely configured site or cluster wide, they will only be taken into account by object profiles with: 

variable CVMFS_CLIENT_ENABLED ?= true;

WARNING, if not using the standard Quattor NFS configuration, the CernVM-FS automount map (/etc/auto.cvmfs) must be added to /etc/auto.master by other means, e.g.: cvmfs-auto-setup

VO specificities

WARNING, carelessly redirecting a VO's software area towards CernVM-FS will cause all software installation jobs to fail, therefore the VO should be aware of the change.

  • ALICE

... dunno ...

  • ATLAS

Follow ​these instructions

The required ATLAS_LOCAL_AREA environment variable can defined using: 

variable VO_ATLAS_LOCAL_AREA ?= '/path/to/shared/ATLAS/area';
  • CMS

WARNING, quoting CMS: 

This service is not stable enough to use in production. (2011/06/07)

The CMS_LOCAL_SITE can be configured using: 

variable VO_CMS_LOCAL_SITE ?= 'T2_FR_GRIF_subsite-name';
  • LHCb

Let the VO know about the change through a GGUS ticket.

Redirect the software area (VO_LHCB_SW_DIR) to /cvmfs/lhcb.cern.ch

Cleanup Script

An optional cleanup script can be enabled with: 

variable CVMFS_ENABLE_CLIENT_CLEANUP ?= true;