Copyright © 2009
Copyright © 2009
|Revision $Revision: 5901 $||$Date$|
Table of Contents
List of Examples
This module is an implementation of a cache system designed to work with a memcached server. It uses libmemcached client library to connect to several memcached servers that store data. It uses the Key-Value interface exported from the core.
memory costs are no longer on the server
many servers may be used so the memory is virtually unlimited
the cache is persistent so a restart of the server will not affect the cache
memcached is an open-source project so it can be used to exchange data with various other applications
servers may be grouped together (e.g. for security purposes : some can be inside a private network, some can be in a public one)
The following libraries or applications must be installed before running OpenSIPS with this module loaded:
libmemcached can be downloaded from: http://tangent.org/552/libmemcached.html. Download the archive, extract sources, run ./configure, make,sudo make install.
tar -xzvf libmemcached-0.31.tar.gz
sudo make install
The urls of the server groups that OpenSIPS will connect to in order to use the from script cache_store,cache_fetch, etc operations. It can be set more than one time. The prefix part of the URL will be the identifier that will be used from the script.
Example 1.1. Set
... modparam("cachedb_memcached", "cachedb_url","memcached:group1://localhost:9999,127.0.0.1/"); modparam("cachedb_memcached", "cachedb_url","memcached:y://random_url:8888/"); ...
Example 1.2. Use memcached servers
... cache_store("memcached:group1","key","$ru value"); cache_fetch("memcached:y","key",$avp(10)); cache_remove("memcached:group1","key"); ...
The maximum number of microseconds that a local cache query can last. Anything above the threshold will trigger a warning message to the log
Default value is “0 ( unlimited - no warnings )”.
Example 1.3. Set
... modparam("cachedb_memcached", "exec_threshold", 100000) ...