rubbos/app/apache2/manual/mod/mod_disk_cache.html.en

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   8 <title>mod_disk_cache - Apache HTTP Server</title>
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  16 <p class="apache">Apache HTTP Server Version 2.0</p>
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  20 <a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.0</a> &gt; <a href="./">Modules</a></div>
  21 <div id="page-content">
  22 <div id="preamble"><h1>Apache Module mod_disk_cache</h1>
  23 <div class="toplang">
  24 <p><span>Available Languages: </span><a href="../en/mod/mod_disk_cache.html" title="English">&nbsp;en&nbsp;</a> |
  25 <a href="../ko/mod/mod_disk_cache.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
  26 </div>
  27 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Content cache storage manager keyed to URIs</td></tr>
  28 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
  29 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>disk_cache_module</td></tr>
  30 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_disk_cache.c</td></tr></table>
  31 <h3>Summary</h3>
  32
  33     <div class="warning">
  34       This module is experimental. Documentation is still under development...
  35     </div>
  36
  37     <p><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code> implements a disk based storage
  38     manager. It is primarily of use in conjunction with
  39     <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>.</p>
  40
  41     <p>Content is stored in and retrieved from the cache using URI based
  42     keys. Content with access protection is not cached.</p>
  43
  44     <div class="note"><h3>Note:</h3>
  45       <p><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code> requires the services of
  46       <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code>.</p>
  47     </div>
  48 </div>
  49 <div id="quickview"><h3 class="directives">Directives</h3>
  50 <ul id="toc">
  51 <li><img alt="" src="../images/down.gif" /> <a href="#cachedirlength">CacheDirLength</a></li>
  52 <li><img alt="" src="../images/down.gif" /> <a href="#cachedirlevels">CacheDirLevels</a></li>
  53 <li><img alt="" src="../images/down.gif" /> <a href="#cacheexpirycheck">CacheExpiryCheck</a></li>
  54 <li><img alt="" src="../images/down.gif" /> <a href="#cachegcclean">CacheGcClean</a></li>
  55 <li><img alt="" src="../images/down.gif" /> <a href="#cachegcdaily">CacheGcDaily</a></li>
  56 <li><img alt="" src="../images/down.gif" /> <a href="#cachegcinterval">CacheGcInterval</a></li>
  57 <li><img alt="" src="../images/down.gif" /> <a href="#cachegcmemusage">CacheGcMemUsage</a></li>
  58 <li><img alt="" src="../images/down.gif" /> <a href="#cachegcunused">CacheGcUnused</a></li>
  59 <li><img alt="" src="../images/down.gif" /> <a href="#cachemaxfilesize">CacheMaxFileSize</a></li>
  60 <li><img alt="" src="../images/down.gif" /> <a href="#cacheminfilesize">CacheMinFileSize</a></li>
  61 <li><img alt="" src="../images/down.gif" /> <a href="#cacheroot">CacheRoot</a></li>
  62 <li><img alt="" src="../images/down.gif" /> <a href="#cachesize">CacheSize</a></li>
  63 <li><img alt="" src="../images/down.gif" /> <a href="#cachetimemargin">CacheTimeMargin</a></li>
  64 </ul>
  65 </div>
  66
  67 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
  68 <div class="directive-section"><h2><a name="CacheDirLength" id="CacheDirLength">CacheDirLength</a> <a name="cachedirlength" id="cachedirlength">Directive</a></h2>
  69 <table class="directive">
  70 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The number of characters in subdirectory names</td></tr>
  71 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheDirLength <var>length</var></code></td></tr>
  72 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheDirLength 2</code></td></tr>
  73 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
  74 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
  75 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
  76 </table>
  77     <p>The <code class="directive">CacheDirLength</code> directive sets the number
  78     of characters for each subdirectory name in the cache hierarchy.</p>
  79
  80     <div class="note">
  81       <p>The result of <code class="directive"><a href="#cachedirlevels">CacheDirLevels</a></code>* <code class="directive">CacheDirLength</code>
  82       must not be higher than 20.</p>
  83     </div>
  84
  85     <div class="example"><p><code>
  86       CacheDirLength  4
  87     </code></p></div>
  88
  89 </div>
  90 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
  91 <div class="directive-section"><h2><a name="CacheDirLevels" id="CacheDirLevels">CacheDirLevels</a> <a name="cachedirlevels" id="cachedirlevels">Directive</a></h2>
  92 <table class="directive">
  93 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The number of levels of subdirectories in the
  94 cache.</td></tr>
  95 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheDirLevels <var>levels</var></code></td></tr>
  96 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheDirLevels 3</code></td></tr>
  97 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
  98 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
  99 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
 100 </table>
 101     <p>The <code class="directive">CacheDirLevels</code> directive sets the number
 102     of subdirectory levels in the cache. Cached data will be saved this
 103     many directory levels below the <code class="directive"><a href="#cacheroot">CacheRoot</a></code> directory.</p>
 104
 105     <div class="note">
 106       <p>The result of <code class="directive">CacheDirLevels</code>*
 107       <code class="directive"><a href="#cachedirlength">CacheDirLength</a></code> must
 108       not be higher than 20.</p>
 109     </div>
 110
 111     <div class="example"><p><code>
 112       CacheDirLevels  5
 113     </code></p></div>
 114
 115 </div>
 116 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 117 <div class="directive-section"><h2><a name="CacheExpiryCheck" id="CacheExpiryCheck">CacheExpiryCheck</a> <a name="cacheexpirycheck" id="cacheexpirycheck">Directive</a></h2>
 118 <table class="directive">
 119 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Indicates if the cache observes Expires dates when seeking
 120 files</td></tr>
 121 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheExpiryCheck On|Off</code></td></tr>
 122 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheExpiryCheck On</code></td></tr>
 123 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
 124 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 125 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
 126 </table>
 127     <p>More detail will be added here, when the function is implemented.</p>
 128
 129     <div class="example"><p><code>
 130       CacheExpiryCheck Off<br />
 131     </code></p></div>
 132
 133     <div class="warning">
 134       The <code class="directive">CacheExpiryCheck</code> directive is currently
 135       <em>not</em> implemented.
 136     </div>
 137
 138 </div>
 139 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 140 <div class="directive-section"><h2><a name="CacheGcClean" id="CacheGcClean">CacheGcClean</a> <a name="cachegcclean" id="cachegcclean">Directive</a></h2>
 141 <table class="directive">
 142 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The time to retain unchanged cached files that match a
 143 URL</td></tr>
 144 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcClean <var>hours</var> <var>url-string</var></code></td></tr>
 145 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcClean ?</code></td></tr>
 146 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
 147 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 148 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
 149 </table>
 150     <p>More detail will be added here, when the function is implemented.</p>
 151
 152     <div class="example"><p><code>
 153       CacheGcClean 12 /daily_scripts
 154     </code></p></div>
 155
 156     <div class="warning">
 157       The <code class="directive">CacheGcClean</code> directive is currently
 158       <em>not</em> implemented.
 159     </div>
 160
 161 </div>
 162 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 163 <div class="directive-section"><h2><a name="CacheGcDaily" id="CacheGcDaily">CacheGcDaily</a> <a name="cachegcdaily" id="cachegcdaily">Directive</a></h2>
 164 <table class="directive">
 165 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The recurring time each day for garbage collection to be run.
 166 (24 hour clock)</td></tr>
 167 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcDaily <var>time</var></code></td></tr>
 168 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcDaily ?</code></td></tr>
 169 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
 170 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 171 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
 172 </table>
 173     <p>More detail will be added here, when the function is implemented.</p>
 174
 175     <div class="example"><p><code>
 176       CacheGcDaily 23:59
 177     </code></p></div>
 178
 179     <div class="warning">
 180       The <code class="directive">CacheGcDaily</code> directive is currently
 181       <em>not</em> implemented.
 182     </div>
 183
 184 </div>
 185 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 186 <div class="directive-section"><h2><a name="CacheGcInterval" id="CacheGcInterval">CacheGcInterval</a> <a name="cachegcinterval" id="cachegcinterval">Directive</a></h2>
 187 <table class="directive">
 188 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The interval between garbage collection attempts.</td></tr>
 189 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcInterval <var>hours</var></code></td></tr>
 190 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
 191 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 192 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
 193 </table>
 194     <p>The <code class="directive">CacheGcInterval</code> directive specifies the
 195     number of hours to wait between attempts to free up disk space.</p>
 196     <p>More detail will be added here, when the function is implemented.</p>
 197
 198     <div class="example"><p><code>
 199       CacheGcInterval  24<br />
 200     </code></p></div>
 201
 202     <div class="warning">
 203       The <code class="directive">CacheGcInterval</code> directive is currently
 204       <em>not</em> implemented.
 205     </div>
 206
 207 </div>
 208 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 209 <div class="directive-section"><h2><a name="CacheGcMemUsage" id="CacheGcMemUsage">CacheGcMemUsage</a> <a name="cachegcmemusage" id="cachegcmemusage">Directive</a></h2>
 210 <table class="directive">
 211 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The maximum kilobytes of memory used for garbage
 212 collection</td></tr>
 213 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcMemUsage <var>KBytes</var></code></td></tr>
 214 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcMemUsage ?</code></td></tr>
 215 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
 216 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 217 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
 218 </table>
 219     <p>More detail will be added here, when the function is implemented.</p>
 220
 221     <div class="example"><p><code>
 222       CacheGcMemUsage 16
 223     </code></p></div>
 224
 225     <div class="warning">
 226       The <code class="directive">CacheGcMemUsage</code> directive is currently
 227       <em>not</em> implemented.
 228     </div>
 229
 230 </div>
 231 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 232 <div class="directive-section"><h2><a name="CacheGcUnused" id="CacheGcUnused">CacheGcUnused</a> <a name="cachegcunused" id="cachegcunused">Directive</a></h2>
 233 <table class="directive">
 234 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The time to retain unreferenced cached files that match a
 235 URL.</td></tr>
 236 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcUnused <var>hours</var> <var>url-string</var></code></td></tr>
 237 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcUnused ?</code></td></tr>
 238 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
 239 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 240 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
 241 </table>
 242     <p>More detail will be added here, when the function is implemented.</p>
 243
 244     <div class="example"><p><code>
 245       CacheGcUnused 12 /local_images
 246     </code></p></div>
 247
 248     <div class="warning">
 249       The <code class="directive">CacheGcUnused</code> directive is currently
 250       <em>not</em> implemented.
 251     </div>
 252
 253 </div>
 254 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 255 <div class="directive-section"><h2><a name="CacheMaxFileSize" id="CacheMaxFileSize">CacheMaxFileSize</a> <a name="cachemaxfilesize" id="cachemaxfilesize">Directive</a></h2>
 256 <table class="directive">
 257 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The maximum size (in bytes) of a document to be placed in the
 258 cache</td></tr>
 259 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheMaxFileSize <var>bytes</var></code></td></tr>
 260 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheMaxFileSize 1000000</code></td></tr>
 261 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
 262 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 263 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
 264 </table>
 265     <p>The <code class="directive">CacheMaxFileSize</code> directive sets the
 266     maximum size, in bytes, for a document to be considered for storage in
 267     the cache.</p>
 268
 269     <div class="example"><p><code>
 270       CacheMaxFileSize 64000
 271     </code></p></div>
 272
 273 </div>
 274 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 275 <div class="directive-section"><h2><a name="CacheMinFileSize" id="CacheMinFileSize">CacheMinFileSize</a> <a name="cacheminfilesize" id="cacheminfilesize">Directive</a></h2>
 276 <table class="directive">
 277 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The minimum size (in bytes) of a document to be placed in the
 278 cache</td></tr>
 279 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheMinFileSize <var>bytes</var></code></td></tr>
 280 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheMinFileSize 1</code></td></tr>
 281 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
 282 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 283 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
 284 </table>
 285     <p>The <code class="directive">CacheMinFileSize</code> directive sets the
 286     minimum size, in bytes, for a document to be considered for storage
 287     in the cache.</p>
 288
 289     <div class="example"><p><code>
 290       CacheMinFileSize 64
 291     </code></p></div>
 292
 293 </div>
 294 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 295 <div class="directive-section"><h2><a name="CacheRoot" id="CacheRoot">CacheRoot</a> <a name="cacheroot" id="cacheroot">Directive</a></h2>
 296 <table class="directive">
 297 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The directory root under which cache files are
 298 stored</td></tr>
 299 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheRoot <var>directory</var></code></td></tr>
 300 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
 301 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 302 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
 303 </table>
 304     <p>The <code class="directive">CacheRoot</code> directive defines the name of
 305     the directory on the disk to contain cache files. If the <code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code> module has been loaded or compiled in to the
 306     Apache server, this directive <em>must</em> be defined. Failing to
 307     provide a value for <code class="directive">CacheRoot</code> will result in
 308     a configuration file processing error. The <code class="directive"><a href="#cachedirlevels">CacheDirLevels</a></code> and <code class="directive"><a href="#cachedirlength">CacheDirLength</a></code> directives define
 309     the structure of the directories under the specified root directory.</p>
 310
 311     <div class="example"><p><code>
 312       CacheRoot c:/cacheroot
 313     </code></p></div>
 314
 315 </div>
 316 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 317 <div class="directive-section"><h2><a name="CacheSize" id="CacheSize">CacheSize</a> <a name="cachesize" id="cachesize">Directive</a></h2>
 318 <table class="directive">
 319 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The maximum amount of disk space that will be used by the
 320 cache in KBytes</td></tr>
 321 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheSize <var>KBytes</var></code></td></tr>
 322 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheSize 1000000</code></td></tr>
 323 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
 324 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 325 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
 326 </table>
 327     <p>The <code class="directive">CacheSize</code> directive sets the desired
 328     disk space usage of the cache, in KBytes (1024-byte units). This
 329     directive does not put a  hard limit on the size of the cache. The
 330     garbage collector will delete files until the usage is at or below the
 331     settings. Always use a value that is lower than the available disk
 332     space.</p>
 333
 334     <div class="example"><p><code>
 335       CacheSize  5000000
 336     </code></p></div>
 337
 338 </div>
 339 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 340 <div class="directive-section"><h2><a name="CacheTimeMargin" id="CacheTimeMargin">CacheTimeMargin</a> <a name="cachetimemargin" id="cachetimemargin">Directive</a></h2>
 341 <table class="directive">
 342 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The minimum time margin to cache a document</td></tr>
 343 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheTimeMargin <var>?</var></code></td></tr>
 344 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheTimeMargin ?</code></td></tr>
 345 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
 346 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 347 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
 348 </table>
 349     <p>More detail will be added here, when the function is implemented.</p>
 350
 351     <div class="example"><p><code>
 352       CacheTimeMargin X
 353     </code></p></div>
 354
 355     <div class="warning">
 356       The <code class="directive">CacheTimeMargin</code> directive is currently
 357       <em>not</em> implemented.
 358     </div>
 359
 360 </div>
 361 </div>
 362 <div class="bottomlang">
 363 <p><span>Available Languages: </span><a href="../en/mod/mod_disk_cache.html" title="English">&nbsp;en&nbsp;</a> |
 364 <a href="../ko/mod/mod_disk_cache.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
 365 </div><div id="footer">
 366 <p class="apache">Copyright 2009 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
 367 <p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div>
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