libevent-1.4.9-stable.tar.gz

memcached-1.2.6.tar.gz

magent-0.5.tar.gz

#Vi/etc/sysconfig/network-scripts/ifcfg-th0

  IPADDR=192.168.1.90

  NETMASK=255.255.255.0

  GATEWAY=192.168.1.1

  TYPE=Ethernet

  ONBOOT=yes

  #Vi/etc/resolv.conf

  nameserver 192.168.1.1

# yum -y install gcc* glibc* autoconflibtool pkgconfig make

# reboot

　1、编译安装libevent：

# tar–zxvf libevent-1.4.9-stable.tar.gz

# mv libevent-1.4.9-stable libevent
# cd libevent 
# ./configure --prefix=/usr

　2、编译安装Memcached：

# wget http://danga.com/memcached/dist/ memcached-1.2.6.tar.gz
# tar -zxvf memcached-1.2.6.tar.gz –C /usr/local

# cd /usr/local

# mv memcached-1.2.6 memcached
# cd memcached
# ./configure --with-libevent=/usr/local
# make

# make install
# exportPKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig

# wget http://memagent.googlecode.com/files/magent-0.5.tar.gz

# cd /usr/local

# mkdir magent
# tar -zxf magent-0.5.tar.gz –C /usr/local/ magent

# cd /usr/local/ magent
# /sbin/ldconfig
# sed -i "s#LIBS = -levent#LIBS = -levent-lm#g" Makefile
# vi magetn.c

添加：

# make
# cp magent /usr/bin/magent
# . /etc/init.d/iptables stop

magent -u root -n 51200 -l 192.168.1.90-p 12000 -s 192.168.1.111:11211 -s 192.168.1.112:11212     -b 192.168.1.112:11211

# memcached -m 1 -u root -d -l127.0.0.1 -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 -s127.0.0.1:11212     -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setkey2，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）。

　　六、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   001:44 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.

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