-MediaWiki has optional support for memcached, a "high-performance,
-distributed memory object caching system". For general information
+MediaWiki has optional support for memcached, a "high-performance,
+distributed memory object caching system". For general information
on it, see: http://www.danga.com/memcached/
Memcached is likely more trouble than a small site will need, but
== Installation ==
Packages are available for Fedora, Debian, Ubuntu and probably other
-Linux distributions. If you there's no package available for your
+Linux distributions. If there's no package available for your
distribution, you can compile it from source.
== Compilation ==
* memcached: http://www.danga.com/memcached/download.bml
(as of this writing, 1.1.9 is current)
-
+
Memcached and libevent are under BSD-style licenses.
The server should run on Linux and other Unix-like systems... you
the internet can put data into and read data from your cache.
An attacker familiar with MediaWiki internals could use this to steal
-passwords and email addresses, or to make themselves a sysop and
-install malicious javascript on the site. There may be other types
-of vulnerability, no audit has been done -- so be safe and keep it
+passwords and email addresses, or to make themselves a sysop and
+install malicious javascript on the site. There may be other types
+of vulnerability, no audit has been done -- so be safe and keep it
behind a firewall.
********************* W A R N I N G ! ! ! ! ! ***********************
== PHP client for memcached ==
MediaWiki uses a fork of Ryan T. Dean's pure-PHP memcached client.
-The newer PECL module is not yet supported.
+It also supports the PECL PHP extension for memcached.
MediaWiki uses three object for object caching:
* $wgMemc, controlled by $wgMainCacheType
disable itself fairly smoothly.
By default, $wgMemc is used but when it is $parserMemc or $messageMemc
-this is mentionned below.
+this is mentioned below.
== Keys used ==
expriry: $wgRevisionCacheExpiry
Sessions:
- controlled by: $wgSessionsInMemcached
+ controlled by: $wgSessionsInObjectCache
key: $wgBDname:session:$id
ex: wikidb:session:38d7c5b8d3bfc51egf40c69bc40f8be3
stores: $SESSION, useful when using a multi-sever wiki
controlled by: $wgStatsMethod
key: $wgDBname:stats:$key
ex: wikibd:stats:request_with_session
- stores: counter for statistics (see maintenance/stats.php script)
+ stores: counter for statistics (see maintenance/showCacheStats.php script)
expiry: none (?)
- cleared by: maintenance/clear_stats.php script
+ cleared by: maintenance/clearCacheStats.php script
User:
key: $wgDBname:user:id:$sId
stores: instance of class User
set in: User::saveToCache()
cleared by: User::saveSettings(), User::clearSharedCache()
-
+
... more to come ...