架构图如下：
主从服务器配置（略）
master：188.188.1.144 slave：188.188.1.175
在Master和slave 上配置代理的访问用户：
grant all privileges on *.* to 'root'@'188.188.1.1%' identified by '123456';
2.mysql-proxy配置（188.188.1.138）
2.1 安装前配置：
安装mysql客户端
检查如下包是否安装：
rpm -qa | grep name gcc* gcc-c++* autoconf* automake* zlib* libxml* ncurses-devel* libmcrypt* libtool* flex* pkgconfig* libevent* glib*
安装libmcrypt
tar zxvf libmcrypt-2.5.8.tar.gz cd libmcrypt-2.5.8/ ./configure make make install
/sbin/ldconfig cd libltdl/ ./configure --enable-ltdl-install make make install
安装 ncurses-devel
rpm -ivh ncurses-devel-5.5-24.20060715.i386.rpm
2.1 安装LUA
[root@localhost soft]# tar -zxvf lua-5.2.0.tar.gz [root@localhost soft]# cd lua-5.2.0 [root@localhost lua-5.2.0]# ls doc Makefile README src [root@localhost lua-5.2.0]# make linux [root@localhost lua-5.2.0]# make install
导出环境变量：
[root@localhost lua-5.2.0]# export LUA_CFLAGS="-I/usr/local/include" LUA_LIBS="-L/usr/local/lib -llua -ldl" LDFLAGS="-lm"
2.2 安装mysql-proxy
32位CENTOS平台：
http://mysql.cdpa.nsysu.edu.tw/Downloads/MySQL-Proxy/mysql-proxy-0.8.1-linux-rhel5-x86-32bit.tar.gz
64位CENTOS平台：
http://mysql.cdpa.nsysu.edu.tw/Downloads/MySQL-Proxy/mysql-proxy-0.8.1-linux-rhel5-x86-64bit.tar.gz
解压安装：
[root@localhost soft]# tar -zxvf mysql-proxy-0.8.1-linux-rhel5-x86-32bit.tar.gz [root@localhost soft]# mv mysql-proxy-0.8.1-linux-rhel5-x86-32bit /usr/local/mysql-proxy [root@localhost soft]# cd /usr/local/mysql-proxy/ [root@localhost mysql-proxy]# ls bin include lib libexec share
设置路径变量：
[root@localhost mysql-proxy]# vi /etc/profile export PATH=$PATH:/usr/local/mysql-proxy/bin [root@localhost mysql-proxy]# source /etc/profile
2.3 查看mysql-proxy选项
PROXY_PATH=/opt/mysql-proxy/bin //定义mysql-proxy服务二进制文件路径 PROXY_OPTIONS=”–admin-username=root \ //定义内部管理服务器账号 --admin-password=password \ //定义内部管理服务器密码 --proxy-read-only-backend-addresses=188.188.1.175:3306 \ //定义后端只读从服务器地址 --proxy-backend-addresses=188.188.1.144:3306 \ //定义后端主服务器地址 --admin-lua-script=/opt/mysql-proxy/lib/mysql-proxy/lua/admin.lua \ //定义lua管理脚本路径 --proxy-lua-script=/opt/mysql-proxy/scripts/rw-splitting.lua” \ //定义lua读写分离脚本路径 PROXY_PID=/opt/mysql-proxy/run/mysql-proxy.pid //定义mysql-proxy PID文件路径 $NICELEVEL $PROXY_PATH/mysql-proxy $PROXY_OPTIONS \ --daemon \ //定义以守护进程模式启动 --keepalive \ //使进程在异常关闭后能够自动恢复 --pid-file=$PROXY_PID \ //定义mysql-proxy PID文件路径 --user=mysql \ //以mysql用户身份启动服务 --log-level=debug \ //定义log日志级别，由高到低分别有(error|warning|info|message|debug) --log-file=/opt/mysql-proxy/log/mysql-proxy.log //定义log日志文件路径
2.4 修改读写分离脚本
修改读写分离脚本rw-splitting.lua
修改默认连接，进行快速测试，不修改的话要达到连接数为4时才启用读写分离
[root@localhost mysql-proxy]# vi rw-splitting.lua
....
-- connection pool
if not proxy.global.config.rwsplit then
proxy.global.config.rwsplit = {
min_idle_connections = 1, #修改为1
max_idle_connections = 1, #修改为1
is_debug = true
}
end
2.5 启动服务：
[root@localhost ~]# mysql-proxy --admin-username=root --admin-password=123456 --admin-lua-script=/usr/local/mysql-proxy/lib/mysql-proxy/lua/admin.lua --proxy-read-only-backend-addresses=188.188.1.175:3306 --proxy-backend-addresses=188.188.1.144:3306 --proxy-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua --log-level=info --log-file=/usr/local/mysql-proxy/logs/mysq-proxy.log & [1] 30332
查看服务运行端口：
[root@localhost ~]# netstat -ntpl Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:4040 0.0.0.0:* LISTEN 30332/mysql-proxy tcp 0 0 0.0.0.0:4041 0.0.0.0:* LISTEN 30332/mysql-proxy tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 2660/portmap tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 3013/cupsd tcp 0 0 0.0.0.0:759 0.0.0.0:* LISTEN 2697/rpc.statd tcp 0 0 :::22 :::* LISTEN 2999/sshd
查看服务：
[root@localhost ~]# ps -ef | grep mysql-proxy root 30332 3351 0 21:10 pts/0 00:00:00 /usr/local/mysql-proxy/libexec/mysql-proxy --admin-username=root --admin-password=123456 --admin-lua-script=/usr/local/mysql-proxy/lib/mysql-proxy/lua/admin.lua --proxy-read-only-backend-addresses=188.188.1.175:3306 --proxy-backend-addresses=188.188.1.144:3306 --proxy-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua --log-level=info --log-file=/usr/local/mysql-proxy/logs/mysq-proxy.log root 30345 3351 0 21:12 pts/0 00:00:00 grep mysql-proxy
3.测试：
为了测试读写分离，先停掉从服务
[root@localhost logs]# mysql -uroot -p123456 -h188.188.1.138 -P4040 mysql> use ckl
查看表：
mysql> select * from qinglv; [read_query] 188.188.1.138:56958 current backend = 0 client default db = ckl client username = root query = select * from qinglv sending to backend : 188.188.1.175:3306 is_slave : true server default db: ckl server username : root in_trans : false in_calc_found : false COM_QUERY : true +-----------+------+ | name | age | +-----------+------+ | ckl | 26 | | xiong | 24 | | ckl | 26 | | xiong | 24 | | kangle | 0 | | kangkang | 26 | | xiaoxiong | 24 | | haha | 33 | | ceshi | 34 | | wukaka | 30 | | heixiu | 28 | | zengjia | 22 | | mama | 23 | | meko | 32 | | kkk | 89 | | jkl | 20 | | jia | 23 | +-----------+------+ 17 rows in set (0.00 sec)
插入数据：
mysql> insert into qinglv values('wuba',25);
[read_query] 188.188.1.138:56958
current backend = 0
client default db = ckl
client username = root
query = insert into qinglv values('wuba',25)
sending to backend : 188.188.1.144:3306
is_slave : false
server default db: ckl
server username : root
in_trans : false
in_calc_found : false
COM_QUERY : true
Query OK, 1 row affected (0.01 sec)
查看表：
mysql> select * from qinglv; [read_query] 188.188.1.138:56958 current backend = 0 client default db = ckl client username = root query = select * from qinglv server default db: client default db: ckl syncronizing sending to backend : 188.188.1.175:3306 is_slave : true server default db: server username : root in_trans : false in_calc_found : false COM_QUERY : true +-----------+------+ | name | age | +-----------+------+ | ckl | 26 | | xiong | 24 | | ckl | 26 | | xiong | 24 | | kangle | 0 | | kangkang | 26 | | xiaoxiong | 24 | | haha | 33 | | ceshi | 34 | | wukaka | 30 | | heixiu | 28 | | zengjia | 22 | | mama | 23 | | meko | 32 | | kkk | 89 | | jkl | 20 | | jia | 23 | +-----------+------+ 17 rows in set (0.00 sec)
没有数据
启动主从同步，再查看：
mysql> select * from qinglv; [read_query] 188.188.1.138:56958 current backend = 0 client default db = ckl client username = root query = select * from qinglv sending to backend : 188.188.1.175:3306 is_slave : true server default db: ckl server username : root in_trans : false in_calc_found : false COM_QUERY : true +-----------+------+ | name | age | +-----------+------+ | ckl | 26 | | xiong | 24 | | ckl | 26 | | xiong | 24 | | kangle | 0 | | kangkang | 26 | | xiaoxiong | 24 | | haha | 33 | | ceshi | 34 | | wukaka | 30 | | heixiu | 28 | | zengjia | 22 | | mama | 23 | | meko | 32 | | kkk | 89 | | jkl | 20 | | jia | 23 | | bba | 12 | | wuba | 25 | +-----------+------+ 19 rows in set (0.00 sec)
查看日志：
[root@localhost logs]# cat /usr/local/mysql-proxy/logs/mysq-proxy.log 2012-03-29 21:10:48: (message) mysql-proxy 0.8.1 started 2012-03-29 21:10:48: (message) proxy listening on port :4040 2012-03-29 21:10:48: (message) added read/write backend: 188.188.1.144:3306 2012-03-29 21:10:48: (message) added read-only backend: 188.188.1.175:3306 2012-03-29 21:14:45: (message) mysql-proxy 0.8.1 started 2012-03-29 21:14:45: (message) proxy listening on port :4040 2012-03-29 21:14:45: (message) added read/write backend: 188.188.1.144:3306 2012-03-29 21:14:45: (message) added read-only backend: 188.188.1.175:3306
至此，读写分离完成。