memcache集群服务：memagent配置使用

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本文详细介绍了如何在Linux环境下安装magent代理和Memcached缓存服务，包括安装依赖库、编译安装magent、配置Memcached节点，并通过实例演示了如何使用magent代理进行数据分发。

magent使用

一、Linux环境下安装magent：
　　1、安装libevent：

wget http://monkey.org/~provos/libevent-1.4.13-stable.tar.gz tar -xzvf libevent-1.4.13-stable.tar.gz cd libevent-1.4.13-stable ./configure --prefix=/usr/local/libevent make make install

2、安装Memcached：

wget http://memcached.googlecode.com/files/memcached-1.4.4.tar.gz tar -xzvf memcached-1.4.4.tar.gz cd memcached-1.4.4 ./configure --prefix=/usr/local/memcached --with-libevent=/usr/local/libevent make make install ln -s /usr/local/libevent/lib/libevent-1.4.so.2 /usr/lib/

3、编译安装magent：

mkdir magent cp magent-0.5.tar.gz magent cd magent tar -xzvf magent-0.5.tar.gz /sbin/ldconfig sed -i "s#LIBS = -levent#LIBS = -levent -lm#g" Makefile vi magent.c 添加 #include <limits.h> make

二、使用实例：

memcached -m 1 -u root -d -l 192.168.1.219 -p 11211 memcached -m 1 -u root -d -l 192.168.1.219 -p 11212 memcached -m 1 -u root -d -l 192.168.1.219 -p 11213

magent -u root -n 51200 -l 192.168.1.219 -p 12000 -s 192.168.1.219:11211 -s 192.168.1.219:11212 -b 192.168.1.219:11213

1、分别在11211、11212、11213端口启动3个Memcached进程，在12000端口开启magent代理程序；
　　2、11211、11212端口为主Memcached，11213端口为备份Memcached；
　　3、连接上12000的magent，set key1和set key2，根据哈希算法，key1被写入11212和11213端口的Memcached，key2被写入11212和11213端口的Memcached；
　　4、当11211、11212端口的Memcached死掉，连接到12000端口的magent取数据，数据会从11213端口的Memcached取出。

三、整个测试流程：

# telnet 192.168.1.219 12000 Trying 1192.168.1.219... Connected to 192.168.1。219. Escape character is '^]'. stats memcached agent v0.4 matrix 1 -> 192.168.1.219:11211, pool size 0 matrix 2 -> 192.168.1.219:11212, pool size 0 END set key1 0 0 5 reesun STORED set key2 0 0 6 reesun1 STORED quit Connection closed by foreign host. # telnet 192.168.1.219 11211 Trying 192.168.1.219... Connected to 192.168.1.219. Escape character is '^]'. get key1 END get key2 VALUE key2 0 6 reesun1 END quit Connection closed by foreign host. # telnet 192.168.1.219 11212 Trying 192.168.1.219... Connected to 1192.168.1.219. Escape character is '^]'. get key1 VALUE key1 0 5 reesun END get key2 END quit Connection closed by foreign host. # telnet 192.168.1.219 11213 Trying 192.168.1.219... Connected to 1192.168.1.219. Escape character is '^]'. get key1 VALUE key1 0 5 reesun END get key2 VALUE key2 0 6 reesun1 END quit Connection closed by foreign host.