magent做memcached集群

magent是一款开源的Memcached代理服务器软件，其项目网址为：http://code.google.com/p/memagent/ 一、安装步骤：编译安装libevent：wget http://monkey.org/~provos/libevent-1.4.9-stable.tar.gztar zxvf libevent-1.4.9-stable.tar.gz

andyxm

3064人浏览 · 2010-07-28 18:57:00

andyxm · 2010-07-28 18:57:00 发布

magent是一款开源的Memcached代理服务器软件，其项目网址为：
http://code.google.com/p/memagent/

一、安装步骤：

编译安装libevent：

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=/usr make && make install cd ../

编译安装Memcached：

编译安装magent：

二、使用实例：

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，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；
　　5、当11211、11212端口的Memcached重启复活，连接到12000端口，magent会从11211或11212端口的 Memcached取数据，由于这两台Memcached重启后无数据，因此magent取得的将是空值，尽管11213端口的Memcached还有数据（此问题尚待改进）。

命令详解：

-h this message -u uid -g gid -p port, default is 11211. (0 to disable tcp support) -s ip:port, set memcached server ip and port -b ip:port, set backup memcached server ip and port -l ip, local bind ip address, default is 0.0.0.0 -n number, set max connections, default is 4096 -D do not go to background -k use ketama key allocation algorithm -f file, unix socket path to listen on. default is off -i number, max keep alive connections for one memcached server, default is 20 -v verbose

三、整个测试流程：

[root@centos52 ~]# telnet 127.0.0.1 12000 Trying 127.0.0.1... Connected to 127.0.0.1. Escape character is '^]'. 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@centos52 ~]# telnet 127.0.0.1 11211 Trying 127.0.0.1... Connected to 127.0.0.1. Escape character is '^]'. get key1 END get key2 VALUE key2 0 8 zhangyan END quit Connection closed by foreign host.

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

[root@centos52 ~]# telnet 127.0.0.1 11213 Trying 127.0.0.1... Connected to 127.0.0.1. Escape character is '^]'. 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@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@centos52 ~]# kill -9 6589 [root@centos52 ~]# kill -9 6591 [root@centos52 ~]# telnet 127.0.0.1 12000 Trying 127.0.0.1... Connected to 127.0.0.1. Escape character is '^]'. 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@centos52 ~]# memcached -m 1 -u root -d -l 127.0.0.1 -p 11211 [root@centos52 ~]# memcached -m 1 -u root -d -l 127.0.0.1 -p 11212 [root@centos52 ~]# telnet 127.0.0.1 12000 Trying 127.0.0.1... Connected to 127.0.0.1. Escape character is '^]'. get key1 END get key2 END quit Connection closed by foreign host.