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Apache > HTTP Server > Documentation > Version 2.2 > Modules

Apache Module mod_disk_cache

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Description:Content cache storage manager keyed to URIs
Status:Extension
Module Identifier:disk_cache_module
Source File:mod_disk_cache.c

Summary

mod_disk_cache implements a disk based storage manager. It is primarily of use in conjunction with mod_cache.

Content is stored in and retrieved from the cache using URI based keys. Content with access protection is not cached.

htcacheclean can be used to maintain the cache size at a maximum level.

Note:

mod_disk_cache requires the services of mod_cache.

Note:

mod_disk_cache uses the sendfile feature to serve files from the cache when supported by the platform, and when enabled with EnableSendfile. However, per-directory and .htaccess configuration of EnableSendfile are ignored by mod_disk_cache as the corresponding settings are not available to the module when a request is being served from the cache.

Directives

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CacheDirLength Directive

Description:The number of characters in subdirectory names
Syntax:CacheDirLength length
Default:CacheDirLength 2
Context:server config, virtual host
Status:Extension
Module:mod_disk_cache

The CacheDirLength directive sets the number of characters for each subdirectory name in the cache hierarchy.

The result of CacheDirLevels* CacheDirLength must not be higher than 20.

CacheDirLength 4

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CacheDirLevels Directive

Description:The number of levels of subdirectories in the cache.
Syntax:CacheDirLevels levels
Default:CacheDirLevels 3
Context:server config, virtual host
Status:Extension
Module:mod_disk_cache

The CacheDirLevels directive sets the number of subdirectory levels in the cache. Cached data will be saved this many directory levels below the CacheRoot directory.

The result of CacheDirLevels* CacheDirLength must not be higher than 20.

CacheDirLevels 5

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CacheMaxFileSize Directive

Description:The maximum size (in bytes) of a document to be placed in the cache
Syntax:CacheMaxFileSize bytes
Default:CacheMaxFileSize 1000000
Context:server config, virtual host
Status:Extension
Module:mod_disk_cache

The CacheMaxFileSize directive sets the maximum size, in bytes, for a document to be considered for storage in the cache.

CacheMaxFileSize 64000

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CacheMinFileSize Directive

Description:The minimum size (in bytes) of a document to be placed in the cache
Syntax:CacheMinFileSize bytes
Default:CacheMinFileSize 1
Context:server config, virtual host
Status:Extension
Module:mod_disk_cache

The CacheMinFileSize directive sets the minimum size, in bytes, for a document to be considered for storage in the cache.

CacheMinFileSize 64

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CacheRoot Directive

Description:The directory root under which cache files are stored
Syntax:CacheRoot directory
Context:server config, virtual host
Status:Extension
Module:mod_disk_cache

The CacheRoot directive defines the name of the directory on the disk to contain cache files. If the mod_disk_cache module has been loaded or compiled in to the Apache server, this directive must be defined. Failing to provide a value for CacheRoot will result in a configuration file processing error. The