一、Linux环境下安装magent：
1、安装libevent：wget ~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
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2、安装Memcached：wget
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/
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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
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一、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
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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.
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