magent一款开源的Memcached代理服务器软件

magent是一款开源 的Memcache d代理 服务器 软件 &＃xff0c;其项目网址为&＃xff1a;

　　http://code.google.com/p/memagent/

　　一、安装步骤&＃xff1a;
　　1、编译安装libevent&＃xff1a;
wget http://monkey.org/~provos/libevent-1.4.9-stable.tar.gz
tar zxvf libevent-1.4.9-stable.tar.gz
cd libevent-1.4.9-stable/
./configure --prefix&＃61;/usr
make && make install
cd ../


　　2、编译安装Memcached&＃xff1a;
wget http://danga.com/memcached/dist/memcached-1.2.6.tar.gz
tar zxvf memcached-1.2.6.tar.gz
cd memcached-1.2.6/
./configure --with-libevent&＃61;/usr
make && make install
cd ../


　　3、编译安装magent&＃xff1a;
mkdir magent
cd magent/
wget http://memagent.googlecode.com/files/magent-0.5.tar.gz
tar zxvf magent-0.5.tar.gz
/sbin/ldconfig
sed -i "s#LIBS &＃61; -levent#LIBS &＃61; -levent -lm#g" Makefile
make
cp magent /usr/bin/magent
cd ../



　　二、使用实例&＃xff1a;
memcached -m 1 -u root -d -l 127.0.0.1 -p 11211
memcached -m 1 -u root -d -l 127.0.0.1 -p 11212
memcached -m 1 -u root -d -l 127.0.0.1 -p 11213
magent -u root -n 51200 -l 127.0.0.1 -p 12000 -s 127.0.0.1:11211 -s 127.0.0.1:11212 -b 127.0.0.1:11213

　　1、分别在11211、11212、11213端口 启动3个Memcached进程 &＃xff0c;在12000端口开启magent代理程序 &＃xff1b;
　　2、11211、11212端口为主Memcached&＃xff0c;11213端口为备份Memcached&＃xff1b;
　　3、连接上12000的magent&＃xff0c;set key1和set key2&＃xff0c;根据哈希算法&＃xff0c;key1被写入11212和11213端口的Memcached&＃xff0c;key2被写入11212和11213端口的Memcached&＃xff1b;
　　4、当11211、11212端口的Memcached死掉&＃xff0c;连接到12000端口的magent取数据 &＃xff0c;数据会从11213端口的Memcached取出&＃xff1b;
　　5、当11211、11212端口的Memcached重启复活&＃xff0c;连接到12000端口&＃xff0c;magent会从11211或11212端口的 Memcached取数据&＃xff0c;由于这两台Memcached重启后无数据&＃xff0c;因此magent取得的将是空值&＃xff0c;尽管11213端口的Memcached还有数 据&＃xff08;此问题尚待改进&＃xff09;。


　　三、整个测试流程&＃xff1a;
[root&＃64;centos 52 ~]# telnet 127.0.0.1 12000
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is &＃39;^]&＃39;.
stats
memcached agent v0.4
matrix 1 -> 127.0.0.1:11211, pool size 0
matrix 2 -> 127.0.0.1:11212, pool size 0
END
set key1 0 0 8
zhangyan
STORED
set key2 0 0 8
zhangyan
STORED
quit
Connection closed by foreign host.


[root&＃64;centos52 ~]# telnet 127.0.0.1 11211
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is &＃39;^]&＃39;.
get key1
END
get key2
VALUE key2 0 8
zhangyan
END
quit
Connection closed by foreign host.


[root&＃64;centos52 ~]# telnet 127.0.0.1 11212
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is &＃39;^]&＃39;.
get key1
VALUE key1 0 8
zhangyan
END
get key2
END
quit
Connection closed by foreign host.


[root&＃64;centos52 ~]# telnet 127.0.0.1 11213
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is &＃39;^]&＃39;.
get key1
VALUE key1 0 8
zhangyan
END
get key2
VALUE key2 0 8
zhangyan
END
quit
Connection closed by foreign host.


模拟11211、11212端口的Memcached死掉
[root&＃64;centos52 ~]# ps -ef | grep memcached
root    6589     1   0 01:25 ?        00:00:00 memcached -m 1 -u root -d -l 127.0.0.1 -p 11211
root    6591     1   0 01:25 ?        00:00:00 memcached -m 1 -u root -d -l 127.0.0.1 -p 11212
root    6593     1   0 01:25 ?        00:00:00 memcached -m 1 -u root -d -l 127.0.0.1 -p 11213
root    6609   6509   0 01:44 pts/0 00:00:00 grep memcached
[root&＃64;centos52 ~]# kill -9 6589
[root&＃64;centos52 ~]# kill -9 6591
[root&＃64;centos52 ~]# telnet 127.0.0.1 12000
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is &＃39;^]&＃39;.
get key1
VALUE key1 0 8
zhangyan
END
get key2
VALUE key2 0 8
zhangyan
END
quit
Connection closed by foreign host.


模拟11211、11212端口的Memcached重启复活
[root&＃64;centos52 ~]# memcached -m 1 -u root -d -l 127.0.0.1 -p 11211
[root&＃64;centos52 ~]# memcached -m 1 -u root -d -l 127.0.0.1 -p 11212
[root&＃64;centos52 ~]# telnet 127.0.0.1 12000
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is &＃39;^]&＃39;.
get key1
END
get key2
END
quit
Connection closed by foreign host.