Apache HTTP Server Version 2.3
Apache HTTP Server Version 2.3
| Description: | Content cache storage manager keyed to URIs |
|---|---|
| Status: | Extension |
| Module Identifier: | disk_cache_module |
| Source File: | mod_disk_cache.c |
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.
mod_disk_cache requires the services of
mod_cache.
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.
| 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. It can
be used in conjunction with CacheDirLevels to
determine the approximate structure of your cache hierarchy.
A high value for CacheDirLength combined
with a low value for CacheDirLevels will result in
a relatively flat hierarchy, with a large number of subdirectories at each
level.
The result of CacheDirLevels* CacheDirLength
must not be higher than 20.
| Description: | The number of levels of subdirectories in the cache. |
|---|---|
| Syntax: | CacheDirLevels levels |
| Default: | CacheDirLevels 2 |
| 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.
A high value for CacheDirLevels combined
with a low value for CacheDirLength will result in
a relatively deep hierarchy, with a small number of subdirectories at each
level.
The result of CacheDirLevels*
CacheDirLength must
not be higher than 20.
| 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
| 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
| Description: | The minimum size (in bytes) of the document to read and be cached before sending the data downstream |
|---|---|
| Syntax: | CacheReadSize bytes |
| Default: | CacheReadSize 0 |
| Context: | server config, virtual host, directory, .htaccess |
| Status: | Extension |
| Module: | mod_disk_cache |
The CacheReadSize directive sets the
minimum amount of data, in bytes, to be read from the backend before the
data is sent to the client. The default of zero causes all data read of
any size to be passed downstream to the client immediately as it arrives.
Setting this to a higher value causes the disk cache to buffer at least
this amount before sending the result to the client. This can improve
performance when caching content from a reverse proxy.
This directive only takes effect when the data is being saved to the cache, as opposed to data being served from the cache.
CacheReadSize 102400
| Description: | The minimum time (in milliseconds) that should elapse while reading before data is sent downstream |
|---|---|
| Syntax: | CacheReadTime milliseconds |
| Default: | CacheReadTime 0 |
| Context: | server config, virtual host, directory, .htaccess |
| Status: | Extension |
| Module: | mod_disk_cache |
The CacheReadTime directive sets the minimum amount
of elapsed time that should pass before making an attempt to send data
downstream to the client. During the time period, data will be buffered
before sending the result to the client. This can improve performance when
caching content from a reverse proxy.
The default of zero disables this option.
This directive only takes effect when the data is being saved to the
cache, as opposed to data being served from the cache. It is recommended
that this option be used alongside the
CacheReadSize directive to
ensure that the server does not buffer excessively should data arrive faster
than expected.
CacheReadTime 1000
| 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 CacheDirLevels and CacheDirLength directives define
the structure of the directories under the specified root directory.
CacheRoot c:/cacheroot
