CernVM-FS Parameters


Client parameters

Parameters recognized in configuration files under /etc/cvmfs:

CVMFS_ALIEN_CACHE
If set, use an alien cache at the given location
CVMFS_ALT_ROOT_PATH
If set to yes, use alternative root catalog path. Only required for fixed catalogs (tag / hash) under the alternative path.
CVMFS_ARCH
Automatically set by CVMFS to reflect the CPU architecture on which the client runs (using uname -m). Allows to utilize variant symlinks with cvmfs installations to auto-select the architecture.
CVMFS_AUTO_UPDATE
If set to no, disables the automatic update of file catalogs.
CVMFS_AUTHZ_HELPER
Full path to an authz helper, overwrites the helper hint in the catalog.
CVMFS_AUTHZ_SEARCH_PATH
Full path to the directory that contains the authz helpers.
CVMFS_BACKOFF_INIT
Seconds for the maximum initial backoff when retrying to download data.
CVMFS_BACKOFF_MAX
Maximum backoff in seconds when retrying to download data.
CVMFS_BLACKLIST
File name of the blacklist that denies mounting any revision < revision N. Format: <REPO N where REPO is the repository name, N is the revision number, and the two parts are separated by whitespace. Note: no extra characters are allowed after N, not even whitespace.
CVMFS_CATALOG_WATERMARK
Try to release pinned catalogs when their number surpasses the given watermark. Defaults to 1/4 CVMFS_NFILES; explicitly set by shrinkwrap.
CVMFS_CACHE_ALIEN
Deprecated, legacy parameter. Use CVMFS_ALIEN_CACHE instead.
CVMFS_CACHE_BASE
Location (directory) of the CernVM-FS cache.
CVMFS_CACHE_DIR
Similar to CVMFS_CACHE_BASE, but automatically set by cvmfs. Only might need manual overwriting when using libcvmfs.
CVMFS_CACHE_PRIMARY
Type of cache to use. By default it is posix. (see also the Advanced Cache Configuration section)
CVMFS_CACHE_REFCOUNT
If set to yes, deduplicate open file descriptors by refcounting.
CVMFS_CACHE\<name>_\<param>
Parameters used by advanced cache configuration for cache type <name>. Values for <param> can include e.g. ALIEN, WORKSPACE, LOCATOR, TYPE, and CMDLINE. (see also the Advanced Cache Configuration section)
If set to yes, enables symlink caching in the kernel.
CVMFS_CHECK_PERMISSIONS
If set to no, disable checking of file ownership and permissions (open all files).
CVMFS_CLAIM_OWNERSHIP
If set to yes, allows CernVM-FS to claim ownership of files and directories.
CVMFS_CONFIG_REPOSITORY
CVMFS repository where a CVMFS client will get its config from. The default configuration rpm cvmfs-config-default sets this parameter to cvmfs-config.cern.ch.
CVMFS_CPU_AFFINITY
Comma-separated list to set CPU affinity for all cvmfs components.
CVMFS_DEBUGLOG
If set, run CernVM-FS in debug mode and write a verbose log the the specified file.
CVMFS_DEFAULT_DOMAIN
The default domain will be automatically appended to repository names when given without a domain.
CVMFS_DNS_MIN_TTL
Minimum effective TTL in seconds for DNS queries of proxy server names (not Stratum 1s). Defaults to 1 minute.
CVMFS_DNS_MAX_TTL
Maximum effective TTL in seconds for DNS queries of proxy server names (not Stratum 1s). Defaults to 1 day.
CVMFS_DNS_RETRIES
Number of retries when resolving proxy names
CVMFS_DNS_SERVER
IP of the DNS server CVMFS should use.
CVMFS_DNS_TIMEOUT
Timeout in seconds when resolving proxy names
CVMFS_DNS_ROAMING
If true, watch /etc/resolv.conf for nameserver changes
CVMFS_ENFORCE_ACLS
Enforce POSIX ACLs stored in the repository. Requires libfuse 3.
CVMFS_EXTERNAL_FALLBACK_PROXY
List of HTTP proxies similar to CVMFS_EXTERNAL_HTTP_PROXY. The fallback proxies are added to the end of the normal proxies, and disable DIRECT connections.
CVMFS_EXTERNAL_HTTP_PROXY
Chain of HTTP proxy groups to be used when CernVM-FS is accessing external data
CVMFS_EXTERNAL_MAX_SERVERS
Caps the list of external hosts to the given number (after geo-sorting them)
Semi-colon-separated chain of RFC6249-compliant servers to locate webservers serving external data.
CVMFS_EXTERNAL_TIMEOUT
Timeout in seconds for HTTP requests to an external-data server with a proxy server
CVMFS_EXTERNAL_TIMEOUT_DIRECT
Timeout in seconds for HTTP requests to an external-data server without a proxy server
CVMFS_EXTERNAL_URL
Semicolon-separated chain of webservers serving external data chunks.
CVMFS_FALLBACK_PROXY
List of HTTP proxies similar to CVMFS_HTTP_PROXY. The fallback proxies are added to the end of the normal proxies, and disable DIRECT connections.
CVMFS_FUSE_NOTIFY_INVALIDATION
Disable fuse notify invalidation. By default disabled on macOS to fix stability issues. On Linux systems, it is NOT recommended to turn it off.
CVMFS_FUSE3_MAX_THREADS
Set max number of fuse threads (requires: libfuse3 > 3.12)
CVMFS_FUSE3_IDLE_THREADS
Set max number of idle fuse threads (requires: libfuse3 > 3.12)
CVMFS_FOLLOW_REDIRECTS
When set to yes, follow up to 4 HTTP redirects in requests.
CVMFS_HIDE_MAGIC_XATTRS
If set to yes the client will not expose CernVM-FS specific extended attributes
CVMFS_HOST_RESET_AFTER
See CVMFS_PROXY_RESET_AFTER, for server URLs.
CVMFS_HTTP_PROXY
Chain of HTTP proxy groups used by CernVM-FS. Necessary. Set to DIRECT if you don't use proxies.
CVMFS_HTTP_TRACING
Activates that a tracing header is attached to each CURL request. Consists of uid, pid, and gid. Default is off.
CVMFS_HTTP_TRACING_HEADERS
Adds additional static, user-defined tracing headers. Format: key1:val1|key2:val2|key3:val3. Needs CVMFS_HTTP_TRACING to be set to on.
CVMFS_IGNORE_SIGNATURE
When set to yes, don't verify CernVM-FS file catalog signatures.
CVMFS_INITIAL_GENERATION
Initial inode generation. Used for testing.
CVMFS_INSTRUMENT_FUSE
When set to true gather performance statistics about the FUSE callbacks. The results are displayed with cvmfs_talk internal affairs.
CVMFS_NFS_INTERLEAVED_INODES
In NFS mode, use only inodes of the form an+b, specified as "b%a".
CVMFS_INFLUX_EXTRA_FIELDS
Static fields always attached to the (absolute) output of the InfluxDB Telemetry Aggregator
CVMFS_INFLUX_EXTRA_TAGS
Static tags always attached to the (absolute + delta) output of the InfluxDB Telemetry Aggregator
CVMFS_INFLUX_HOST
Host name or IP address of the receiver of the InfluxDB Telemetry Aggregator
CVMFS_INFLUX_METRIC_NAME
Name of the measurement of the InfluxDB Telemetry Aggregator
CVMFS_INFLUX_PORT
Port of the host (receiver) of the InfluxDB Telemetry Aggregator
CVMFS_IPFAMILY_PREFER
Which IP protocol to prefer when connecting to proxies. Can be either 4 or 6.
CVMFS_IPV4_ONLY
If set to a non-empty value, CVMFS does not try to resolve IPv6 records.
CVMFS_KCACHE_TIMEOUT
Timeout in seconds for path names and file attributes in the kernel file system buffers.
CVMFS_KEYS_DIR
Directory containing *.pub files used as repository signing keys. If set, this parameter has precedence over CVMFS_PUBLIC_KEY.
CVMFS_LIBRARY_PATH
For standalone deployment. Allows cvmfs2 to discover libraries libcvmfs_<...>.so that are not installed in one of standard search paths.
CVMFS_LOW_SPEED_LIMIT
Minimum transfer rate in bytes/second a server or proxy must provide.
CVMFS_MAGIC_XATTRS_VISIBILITY
Allows to hide extended attributes to be listed. Options: always, never, rootonly. rootonly means that the listing can only be requested for /cvmfs/<repo>. For any other file, only a direct request to a specific extended attribute will work.
CVMFS_MAX_EXTERNAL_SERVERS
Limit the number of (geo sorted) stratum 1 servers for external data that are effectively used.
CVMFS_MAX_IPADDR_PER_PROXY
Limit the number of IP addresses a proxy names resolves into. From all registered addresses, up to the limit are randomly selected.
CVMFS_MAX_RETRIES
Maximum number of retries for a given proxy/host combination.
CVMFS_MAX_SERVERS
Limit the number of (geo sorted) stratum 1 servers that are effectively used.
CVMFS_MAX_TTL
Maximum file catalog TTL in minutes. Can overwrite the TTL stored in the catalog.
CVMFS_MEMCACHE_SIZE
Size of the CernVM-FS metadata memory cache in Megabytes.
CVMFS_MOUNT_DIR
Directory where CernVM-FS is mounted to. Default is /cvmfs and cannot be overwritten.
Semi-colon-separated chain of RFC6249-compliant servers to locate Stratum-1 servers.
See CVMFS_PROXY_RESET_AFTER, for metalink servers.
CVMFS_MOUNT_RW
Mount CernVM-FS as a read/write file system. Write operations will fail but this option can workaround faulty open() flags.
CVMFS_NFILES
Maximum number of open file descriptors that can be used by the CernVM-FS process.
CVMFS_NFS_SOURCE
If set to yes, act as a source for the NFS daemon (NFS export).
CVMFS_NFS_SHARED
If set a path, used to store the NFS maps in an SQLite database, instead of the usual LevelDB storage in the cache directory.
CVMFS_PAC_URLS
Chain of URLs pointing to PAC files with HTTP proxy configuration information.
CVMFS_OOM_SCORE_ADJ
Set the Linux kernel's out-of-memory killer priority for the CernVM-FS client [-1000 - 1000].
CVMFS_PROXY_RESET_AFTER
Delay in seconds after which CernVM-FS will retry the primary proxy group in case of a fail-over to another group.
CVMFS_PROXY_SHARD
If set to yes, shard requests across all proxies within the current load-balancing group using consistent hashing.
CVMFS_PROXY_TEMPLATE
Overwrite the default proxy template in Geo-API calls. Only needed for debugging.
CVMFS_PUBLIC_KEY
Colon-separated list of repository signing keys.
CVMFS_PREMOUNT_FUSE
Set to "no" to use fusermount3 to mount cvmfs (may need the fuse package providing fusermount3 to be installed manually).
CVMFS_QUOTA_LIMIT
Soft-limit of the cache in Megabyte.
CVMFS_RELOAD_SOCKETS
Directory of the sockets used by the CernVM-FS loader to trigger hotpatching/reloading.
CVMFS_REPOSITORIES
Comma-separated list of fully qualified repository names to include in use of client utilities such as cvmfs_talk and cvmfs_config. Does not limit which repositories may be mounted, unless CVMFS_STRICT_MOUNT is set to yes.
CVMFS_REPOSITORY_DATE
A timestamp in ISO format (e.g. 2007-03-01T13:00:00Z). Selects the repository state as of the given date.
CVMFS_REPOSITORY_TAG
Select a named repository snapshot that should be mounted instead of trunk.
CVMFS_CONFIG_REPO_REQUIRED
If set to yes, no repository can be mounted unless the config repository is available.
CVMFS_ROOT_HASH
Hash of the root file catalog, implies CVMFS_AUTO_UPDATE=no.
CVMFS_SEND_INFO_HEADER
If set to yes, include the cvmfs path of downloaded data in HTTP headers.
CVMFS_SERVER_CACHE_MODE
Enable special cache semantics for a client used as a publisher's repository base line.
CVMFS_SERVER_URL
Semicolon-separated chain of Stratum\~1 servers.
CVMFS_SHARED_CACHE
If set to no, makes a repository use an exclusive cache.
CVMFS_STATFS_CACHE_TIMEOUT
Caching time of statfs() in seconds (no caching by default). Calling statfs() in high frequency can be expensive.
CVMFS_STREAMING_CACHE
If set to yes, use a download manager to download regular files on read.
CVMFS_STRICT_MOUNT
If set to yes, mount only repositories that are listed in CVMFS_REPOSITORIES.
CVMFS_SUID
If set to yes, enable suid magic on the mounted repository. Requires mounting as root.
CVMFS_SYSLOG_FACILITY
If set to a number between 0 and 7, uses the corresponding LOCALn facility for syslog messages.
CVMFS_SYSLOG_LEVEL
If set to 1 or 2, sets the syslog level for CernVM-FS messages to LOG_DEBUG or LOG_INFO respectively.
CVMFS_SYSLOG_PREFIX
Prefix for each CVMFS message in the syslog. By default it is the repo name.
CVMFS_SYSTEMD_NOKILL
If set to yes, modify the command line to @vmfs2 ... in order to act as a systemd lowlevel storage manager.
CVMFS_TALK_SOCKET
Internal usage. Used for cvmfs_talk. Default socket is /var/spool/cvmfs/<repo>/cvmfs_io.
CVMFS_TALK_OWNER
Internal usage. Used for cvmfs_talk. By default it is the repo owner.
CVMFS_TELEMETRY_RATE
Rate in seconds for Telemetry Aggregator to send the telemetry. Minimum send rate >= 5 sec.
CVMFS_TELEMETRY_SEND
ON to activate Telemetry Aggregator.
CVMFS_TIMEOUT
Timeout in seconds for HTTP requests with a proxy server.
CVMFS_TIMEOUT_DIRECT
Timeout in seconds for HTTP requests without a proxy server.
CVMFS_TRACEBUFFER
Internal usage. Max number of entries of the tracebuffer.
CVMFS_TRACEBUFFER_THRESHOLD
Internal usage. Flush treshold after how many entries the tracebuffer is flushed to file.
CVMFS_TRACEFILE
If set, enables the tracer and trace file system calls to the given file.
CVMFS_USE_GEOAPI
Request order of Stratum 1 servers and fallback proxies via Geo-API.
CVMFS_USE_SSL_SYSTEM_CA
When connecting to an HTTPS endpoint, it will load the certificates provided by the system.
CVMFS_USER
Sets the gid and uid mount options. Don't touch or overwrite.
CVMFS_USYSLOG
All messages that normally are logged to syslog are re-directed to the given file. This file can grow up to 500kB and there is one step of log rotation. Required for muCernVM.
CVMFS_XATTR_PRIVILEGED_GIDS
Comma-separated list of (main) group IDs that are allowed to access the extended attributes listed by CVMFS_XATTR_PROTECTED_XATTRS.
CVMFS_XATTR_PROTECTED_XATTRS
Comma-separated list of extended attributes (full name, e.g. user.fqrn) that are only accessible by root and the group IDs listed by CVMFS_XATTR_PRIVILEGED_GIDS.
CVMFS_WORKSPACE
Set the local directory for storing special files (defaults to the cache directory).
CVMFS_WORLD_READABLE
Override posix read permissions to make files in repository globally readable

Server parameters

CVMFS_AUFS_WARNING
Set to false to silence AUFS kernel deadlock warning.
CVMFS_AUTO_GC
Enables the automatic garbage collection on publish and snapshot
CVMFS_AUTO_GC_TIMESPAN
Date-threshold for automatic garbage collection (For example: 3 days ago, 1 week ago, ...)
CVMFS_AUTO_GC_LAPSE
Frequency of auto garbage collection, only garbage collect if last GC is before the given threshold (For example: 1 day ago)
CVMFS_AUTO_REPAIR_MOUNTPOINT
Set to true to enable automatic recovery from bogus server mount states.
CVMFS_AUTO_TAG
Creates a generic revision tag for each published revision (if set to true).
CVMFS_AUTO_TAG_TIMESPAN
Date-threshold for automatic tags, after which auto tags get removed (For example: 4 days ago)
CVMFS_AUTOCATALOGS
Enable/disable automatic catalog management using autocatalogs.
CVMFS_AUTOCATALOGS_MAX_WEIGHT
Maximum number of entries in an autocatalog to be considered overflowed. Default value: 100000 (see also CVMFS_AUTOCATALOGS)
CVMFS_AUTOCATALOGS_MIN_WEIGHT
Minimum number of entries in an autocatalog to be considered underflowed. Default value: 1000 (see also CVMFS_AUTOCATALOGS)
CVMFS_AVG_CHUNK_SIZE
Desired average size of a file chunk in bytes (see also CVMFS_USE_FILE_CHUNKING)
CVMFS_CATALOG_ALT_PATHS
Enable/disable generation of catalog bootstrapping shortcuts during publishing. (Useful when backend directory /data is not publicly accessible)
CVMFS_CHECK_ALL_MIN_DAYS
Minimum number of days between checking each repository with cvmfs_server check -a. Default value: 30
CVMFS_COMPRESSION_ALGORITHM
Compression algorithm to be used during publishing (currently either default or none)
CVMFS_CREATOR_VERSION
The CernVM-FS version that was used to create this repository (do not change manually).
CVMFS_DONT_CHECK_OVERLAYFS_VERSION
Disable checking of OverlayFS version before usage. (see also the Requirements for a new Repository section)
CVMFS_ENABLE_MTIME_NS
Use nanosecond-granularity for modification time of files (instead of milliseconds)
CVMFS_ENFORCE_LIMITS
Set to true to cause exceeding *LIMIT variables to be fatal to a publish instead of a warning
CVMFS_EXTENDED_GC_STATS
Set to true to keep track of the volume of garbage collected files (increases GC running time)
CVMFS_EXTERNAL_DATA
Set to true to mark that repository contains external data that is served from an external HTTP server
CVMFS_FILE_MBYTE_LIMIT
Maximum number of megabytes for a published file, default value: 1024 (see also CVMFS_ENFORCE_LIMITS)
CVMFS_FORCE_REMOUNT_WARNING
Enable/disable warning through wall and grace period before forcefully remounting a CernVM-FS repository on the release managere machine.
CVMFS_GARBAGE_COLLECTION
Enables repository garbage collection (Stratum~0 only, if set to true). A publish operation is needed after changing this setting to update the repository manifest before garbage collection can run.
CVMFS_GC_DELETION_LOG
Log file path to track all garbage collected objects during sweeping for bookkeeping or debugging
CVMFS_GEO_DB_FILE
Path to externally updated location of geolite2 city database, or 'None' for no database.
CVMFS_GEO_LICENSE_KEY
A license key for downloading the geolite2 city database from maxmind.
CVMFS_GID_MAP
Path of a file for the mapping of file owner group ids.
CVMFS_HASH_ALGORITHM
Define which secure hash algorithm should be used by CernVM-FS for CAS objects (supported are: sha1, rmd160 and shake128)
CVMFS_IGNORE_SPECIAL_FILES
Set to true to skip special files (pipes, sockets, block device and character device files) during publish without aborting.
CVMFS_INCLUDE_XATTRS
Set to true to process extended attributes
CVMFS_MAX_CHUNK_SIZE
Maximal size of a file chunk in bytes (see also CVMFS_USE_FILE_CHUNKING)
CVMFS_MAXIMAL_CONCURRENT_WRITES
Maximal number of concurrently processed files during publishing.
CVMFS_MIN_CHUNK_SIZE
Minimal size of a file chunk in bytes (see also CVMFS_USE_FILE_CHUNKING)
CVMFS_NESTED_KCATALOG_LIMIT
Maximum thousands of files allowed in nested catalogs, default 500 (see also CVMFS_ROOT_KCATALOG_LIMIT and CVMFS_ENFORCE_LIMITS)
CVMFS_NUM_UPLOAD_TASKS
Number of threads used to commit data to storage during publication. Currently only used by the local backend.
CVMFS_NUM_WORKERS
Maximal number of concurrently downloaded files during a Stratum1 pull operation (Stratum~1 only).
CVMFS_PUBLIC_KEY
Colon-separated path to the public key file(s) or directory(ies) of the repository to be replicated. (Stratum 1 only).
CVMFS_PRINT_STATISTICS
Set to true to show publisher statistics on the console
CVMFS_REPLICA_ACTIVE
Stratum1-only: Set to no to skip this repository when executing cvmfs_server snapshot -a
CVMFS_REPOSITORY_NAME
The fully qualified name of the specific repository.
CVMFS_REPOSITORY_TYPE
Defines if the repository is a master copy (stratum0) or a replica (stratum1).
CVMFS_REPOSITORY_TTL
The frequency in seconds of client lookups for changes in the repository. Defaults to 4 minutes.
CVMFS_ROOT_KCATALOG_LIMIT
Maximum thousands of files allowed in root catalogs, default 200 (see also CVMFS_NESTED_KCATALOG_LIMIT and CVMFS_ENFORCE_LIMITS)
CVMFS_SNAPSHOT_GROUP
Group name for subset of repositories used with cvmfs_server snapshot -a -g. Added with cvmfs_server add-replica -g.
CVMFS_SPOOL_DIR
Location of the upstream spooler scratch directories; the read-only CernVM-FS moint point and copy-on-write storage reside here.
CVMFS_STATISTICS_DB
Set a custom path for the publisher statistics database
CVMFS_STATS_DB_DAYS_TO_KEEP
Sets the pruning interval for the publisher statistics database (365 by default)
CVMFS_STRATUM0
URL of the master copy (stratum0) of this specific repository.
CVMFS_STRATUM1
URL of the Stratum1 HTTP server for this specific repository.
CVMFS_SYNCFS_LEVEL
Controls how often sync will be called by cvmfs_server operations. Possible levels are none, default, cautious.
CVMFS_S3_<param>
S3-related parameters. See the S3 Compatible Storage Systems section.
CVMFS_UID_MAP
Path of a file for the mapping of file owner user ids.
CVMFS_UNION_DIR
Mount point of the union file system for copy-on-write semantics of CernVM-FS. Here, changes to the repository are performed (see the CernVM-FS Repository Creation and Updating section).
CVMFS_UNION_FS_TYPE
Defines the union file system to be used for the repository (only overlayfs is fully supported, aufs has no active support anymore)
CVMFS_UPLOAD_STATS_DB
Publish repository statistics data file to the Stratum 0 /stats location
CVMFS_UPLOAD_STATS_PLOTS
Publish repository statistics plots and webpage to the Stratum 0 /stats location (requires ROOT)
CVMFS_UPSTREAM_STORAGE
Upstream spooler description defining the basic upstream storage type and configuration (see below).
CVMFS_USE_FILE_CHUNKING
Allows backend to split big files into small chunks (true | false)
CVMFS_USER
The user name that owns and manipulates the files inside the repository.
CVMFS_VIRTUAL_DIR
Set to true to enable the hidden, virtual .cvmfs/snapshots directory containing entry points to all named tags.
CVMFS_VOMS_AUTHZ
Membership requirement (e.g. VOMS authentication) to be added into the file catalogs
CVMFS_STATISTICS_DB
SQLite file path to store the statistics. Default is /var/spool/cvmfs/<REPO_NAME>/stats.db.
CVMFS_PRINT_STATISTICS
Set to true to enable statistics printing to the standard output.
X509_CERT_BUNDLE
Bundle file with CA certificates for HTTPS connections (see Large-Scale Data CernVM-FS).
X509_CERT_DIR
Directory file with CA certificates for HTTPS connections, defaults to /etc/grid-security/certificates (see Large-Scale Data CernVM-FS).

Deprecated parameters

Will be removed in future versions.

CVMFS_GENERATE_LEGACY_BULK_CHUNKS
Deprecated, set to true to enable generation of whole-file objects for large files.
Deprecated, defaults to true hardlinks are found. Instead automatically break the hardlinks across directories.

Format of CVMFS_UPSTREAM_STORAGE

The format of the CVMFS_UPSTREAM_STORAGE parameter depends on the storage backend. Note that this parameter is initialized by cvmfs_server mkfs resp. cvmfs_server add-replica. The internals of the parameter are only relevant if the configuration is maintained by a configuration management system.

For the local storage backend, the parameter specifies the storage directory (to be served by Apache) and a temporary directory in the form local,<path for temporary files>,<path to storage>, e.g.

CVMFS_UPSTREAM_STORAGE=local,/srv/cvmfs/sw.cvmfs.io/data/txn,/srv/cvmfs/sw.cvmfs.io

For the S3 backend, the parameter specifies a temporary directory and the location of the S3 config file in the form s3,<path for temporary files>,<repository entry URL on the S3 server>@<S3 config file>, e.g.

CVMFS_UPSTREAM_STORAGE=S3,/var/spool/cvmfs/sw.cvmfs.io/tmp,cvmfs/sw.cvmfs.io@/etc/cvmfs/s3.conf

The gateway backend can only be used on a remote publisher (not on a stratum 1). The parameter specifies a temporary directory and the endpoint of the gateway service, e.g.

CVMFS_UPSTREAM_STORAGE=gw,/var/spool/cvmfs/sw.cvmfs.io/tmp,http://cvmfs-gw.cvmfs.io:4929/api/v1

Tiered Cache Parameters

The following parameters are used to configure a tiered cache manager instance.

CVMFS_CACHE_$name_UPPER
Name of the upper layer cache instance
CVMFS_CACHE_$name_LOWER
Name of the lower layer cache instance
CVMFS_CACHE_LOWER_READONLY
Set to true to avoid populating the lower layer

External Cache Plugin Parameters

The following parameters are used to configure an external cache plugin as a cache manager instance.

CVMFS_CACHE_$name_CMDLINE
If the client should start the plugin, the executable and command line parameters of the plugin, separated by comma.
CVMFS_CACHE_$name_LOCATOR
The address of the socket used for communication with the plugin.

In-memory Cache Plugin Parameters

The following parameters are interpreted from the configuration file provided to the in-memory cache plugin (see the Advanced Cache Configuration section).

CVMFS_CACHE_PLUGIN_DEBUGLOG
If set, run CernVM-FS in debug mode and write a verbose log the the specified file.
CVMFS_CACHE_PLUGIN_LOCATOR
The address of the socket used for client communication
CVMFS_CACHE_PLUGIN_SIZE
The amount of RAM in megabyte used by the plugin for caching.