环境描述 :
系统版本：CentOS release 6.6 (Final)  2.6.32-504.el6.x86_64
mysql版本：5.5.32

192.168.0.149:test-A(mysql-proxy)

192.168.0.150:test-B(master)

192.168.0.151:test-C(slave)

注：主从同步已做好，请移步：http://linuxzkq.blog.51cto.com/9379412/1700094


准备工作(test-A:mysql-proxy)：

useradd mysql-proxy -s /sbin/nologin -M
cd tools

wget http://mirrors.sohu.com/mysql/MySQL-Proxy/mysql-proxy-0.8.5-linux-glibc2.3-x86-64bit.tar.gz
tar xf mysql-proxy-0.8.5-linux-glibc2.3-x86-64bit.tar.gz
mv mysql-proxy-0.8.5-linux-glibc2.3-x86-64bit /application/mysql-proxy
echo "export PATH=/application/mysql-proxy/bin/:$PATH" >>/etc/profile
tail -1 /etc/profile
source /etc/profile
which mysql-proxy
cd /application
chown -R mysql-proxy.root mysql-proxy


mysql-proxy命令参数：
[root@test-A ~]# mysql-proxy --help
Usage:
 mysql-proxy [OPTION...] - MySQL Proxy                          
--help-all                                                   Show all help options
--help-proxy                                              Show options for the proxy-module

Application Options:
 -V, --version                                              Show version
 --defaults-file=                                configuration file
 --verbose-shutdown                                 Always log the exit code when shutting down
 --daemon                                                  Start in daemon-mode
 --user=                                          Run mysql-proxy as user
 --basedir=                      Base directory to prepend to relative paths in the config
 --pid-file=                                        PID file in case we are started as daemon
 --plugin-dir=                                 path to the plugins
 --plugins=                                    plugins to load
 --log-level=(error|warning|info|message|debug)          log all messages of level ... or higher
 --log-file=                                        log all messages in a file
 --log-use-syslog                                        log all messages to syslog
 --log-backtrace-on-crash                          try to invoke debugger on crash
 --keepalive                                                 try to restart the proxy if it crashed
 --max-open-files                                        maximum number of open files (ulimit -n)
 --event-threads                                          number of event-handling threads (default: 1)
 --lua-path=<...>                                         set the LUA_PATH
 --lua-cpath=<...>                                       set the LUA_CPATH

 
 
master操作：
mysql> grant all on *.* to 'mysql-proxy'@'192.168.0.%' identified by '123456';
mysql> select user,host from mysql.user;

slave操作：
mysql> grant all on *.* to 'mysql-proxy'@'192.168.0.%' identified by '123456';
mysql> select user,host from mysql.user;


vi /etc/init.d/mysql-proxy  #编辑mysql-proxy管理脚本(test-A:mysql-proxy)
#mysql-proxy.scripts,2015-11.25,linux
############################################
#!/bin/sh
export LUA_PATH=/application/mysql-proxy/share/doc/mysql-prox
y/?.lua:/applicaton/mysql-proxy/lib/mysql-proxy/lua/?.lua

mode=$1
if [ -z "$mode" ] ; then
  mode="start"
fi

case $mode in
  'start')
mysql-proxy --daemon \
--log-level=debug \
--user=mysql-proxy \
--keepalive \
--log-file=/var/log/mysql-proxy.log \
--plugins="proxy" \
#mysql-proxy.scripts

  mode="start"
fi

case $mode in
  'start')
mysql-proxy --daemon \
--log-level=debug \
--user=mysql-proxy \
--keepalive \
--log-file=/var/log/mysql-proxy.log \
--plugins="proxy" \
--proxy-backend-addresses=192.168.0.150:3306 \
--proxy-read-only-backend-addresses=192.168.0.151:3307 \
--plugins="admin" \
--admin-username="admin" \
--admin-password="admin" \
    ;;

  'stop')
    killall mysql-proxy
    ;;

  'restart')
    if $0 stop ; then
      $0 start
    else
      echo  "retart failed!!!"
      exit 1
    fi
    ;;
esac

exit 0
####################################################
chmod 700 /etc/init.d/mysql-proxy
/etc/init.d/mysql-proxy start


[root@test-A application]# netstat -tunlp|grep mysql-proxy
tcp        0      0 0.0.0.0:4040                0.0.0.0:*                   LISTEN      4022/mysql-proxy    
tcp        0      0 0.0.0.0:4041                0.0.0.0:*                   LISTEN      4022/mysql-proxy   
#4040是proxy端口；4041是admin端口，也就是管理

[root@test-C ~]# mysql -umysql-proxy -p -h 192.168.0.149 --port 4040
Enter password:   #多开几个终端，测试连接
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 32
Server version: 5.5.32-log MySQL Community Server (GPL)

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> select user,host from mysql.user;    


[root@test-C ~]# mysql -uadmin -p -h 192.168.0.149 --port 4041
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.0.99-agent-admin

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> select * from backends;          
+-------------+--------------------+---------+------+------+-------------------+
| backend_ndx | address            | state   | type | uuid | connected_clients |
+-------------+--------------------+---------+------+------+-------------------+
|           1 | 192.168.0.150:3306 | up      | rw   | NULL |                 0 |
|           2 | 192.168.0.151:3307 | unknown | ro   | NULL |                 0 |
+-------------+--------------------+---------+------+------+-------------------+
2 rows in set (0.00 sec)
注意：因为rw-splitting.lua脚本默认有4个链接才启用分离；所以多开启几个终端；多测试几下；你也可以去修改里面的相关值

mysql> select * from backends;
+-------------+--------------------+-------+------+------+-------------------+
| backend_ndx | address            | state | type | uuid | connected_clients |
+-------------+--------------------+-------+------+------+-------------------+
|           1 | 192.168.0.150:3306 | up    | rw   | NULL |                 0 |
|           2 | 192.168.0.151:3307 | up    | ro   | NULL |                 0 |
+-------------+--------------------+-------+------+------+-------------------+
2 rows in set (0.00 sec)
#出现两个up,代表读写分离成功。

[root@test-A ~]# lsof -i:4040
COMMAND    PID        USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
mysql-pro 4062 mysql-proxy   10u  IPv4 156977      0t0  TCP *:yo-main (LISTEN)
mysql-pro 4062 mysql-proxy   12u  IPv4 160117      0t0  TCP test-A:yo-main->test-C:53173 (ESTABLISHED)
mysql-pro 4062 mysql-proxy   16u  IPv4 160132      0t0  TCP test-A:yo-main->192.168.0.254:56915 (ESTABLISHED)
mysql-pro 4062 mysql-proxy   17u  IPv4 160060      0t0  TCP test-A:yo-main->test-B:50068 (ESTABLISHED)
mysql-pro 4062 mysql-proxy   18u  IPv4 160145      0t0  TCP test-A:yo-main->192.168.0.254:56916 (ESTABLISHED)
mysql-pro 4062 mysql-proxy   19u  IPv4 159920      0t0  TCP test-A:yo-main->192.168.0.254:56914 (ESTABLISHED)

分离成功，哈哈！