MySQL-Proxy实现读写分离部署文档

实验拓扑图：

实验环境说明：MySQL主从已经部署完成，并且授权mysql-proxy主机数据库权限

系统  centos 6.4 _ x86_64

192.168.0.101   mysql-proxy

192.168.0.102   mysql-master

192.168.0.103   mysql-slave

部署开始：

1. 检查依赖包

[root@shell tools]# rpm -q lua
lua-5.1.4-4.1.el6.x86_64

2.下载通用的压缩包 mysql-proxy-0.8.4-linux-glibc2.3-x86-64bit.tar.gz 直接解压使用

useradd -r mysql-proxy
wget http://cdn.mysql.com/Downloads/MySQL-Proxy/mysql-proxy-0.8.4-linux-glibc2.3-x86-64bit.tar.gz
tar zxf mysql-proxy-0.8.4-linux-glibc2.3-x86-64bit.tar.gz  -C /application
ln -s /application/mysql-proxy-0.8.4-linux-glibc2.3-x86-64bit /application/mysql-proxy

3.环境变量配置

echo "export PATH=/application/mysql-proxy/bin:$PATH" >> /etc/profile
source /etc/profile

4.启动mysql-proxy

[root@mysql-proxy ~]# mysql-proxy --daemon --log-level=debug --log-file=/var/log/mysql-proxy.log --plugins=proxy --proxy-backend-addresses="192.168.0.102:3306" --proxy-read-only-backend-addresses="192.168.0.103:3306" --proxy-lua-script="/application/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua"

5.检查启动结果

[root@mysql-proxy lib]# netstat -nltp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name   
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      971/sshd            
tcp        0      0 0.0.0.0:4040                0.0.0.0:*                   LISTEN      1274/mysql-proxy    
tcp        0      0 :::22

# 此时只能实现简单的读写分离

# 添加启动脚本和管理查询模块

6.为mysql-proxy服务脚本提供配置文件/etc/sysconfig/mysql-proxy

# Options for mysql-proxy 
ADMIN_USER="admin"
ADMIN_PASSWORD="admin"
ADMIN_ADDRESS=""
#ADMIN_ADDRESS="0.0.0.0:4040"
ADMIN_LUA_SCRIPT="/application/mysql-proxy/share/doc/mysql-proxy/admin.lua"
PROXY_ADDRESS=""
PROXY_USER="mysql-proxy"
#PROXY_OPTIONS="--daemon --log-level=info --log-use-syslog"

7.编辑mysql-proxy依赖的admin.lua脚本

cat >> /application/mysql-proxy/share/doc/mysql-proxy/admin.lua < 
  
8. 编辑mysql-proxy启动脚本
 
  
cat >> /etc/init.d/mysql-proxy
#!/bin/bash
#
# mysql-proxy This script starts and stops the mysql-proxy daemon
#
# chkconfig: - 78 30
# processname: mysql-proxy
# description: mysql-proxy is a proxy daemon for mysql

# Source function library.
. /etc/rc.d/init.d/functions

prog="/application/mysql-proxy/bin/mysql-proxy"

# Source networking configuration.
if [ -f /etc/sysconfig/network ]; then
    . /etc/sysconfig/network
fi

# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0

# Set default mysql-proxy configuration.
ADMIN_USER="admin"
ADMIN_PASSWD="admin"
ADMIN_LUA_SCRIPT="/application/mysql-proxy/share/doc/mysql-proxy/admin.lua"
PROXY_OPTIONS="--daemon --log-level=debug --log-file=/var/log/mysql-proxy.log --plugins=proxy --plugins=admin --proxy-backend-addresses=192.168.0.102:3306 --proxy-read-only-backend-addresses=192.168.0.103:3306"
PROXY_PID=/var/run/mysql-proxy.pid
PROXY_USER="mysql-proxy"
PROXY_LUA="/application/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua"
# Source mysql-proxy configuration.
if [ -f /etc/sysconfig/mysql-proxy ]; then
    . /etc/sysconfig/mysql-proxy
fi

RETVAL=0

start() {
    echo -n $"Starting $prog: "
    daemon $prog $PROXY_OPTIONS --pid-file=$PROXY_PID --proxy-address="$PROXY_ADDRESS" --user=$PROXY_USER --admin-username="$ADMIN_USER" --admin-lua-script="$ADMIN_LUA_SCRIPT" --admin-password="$ADMIN_PASSWO
RD"
    RETVAL=$?
    echo
    if [ $RETVAL -eq 0 ]; then
        touch /var/lock/subsys/mysql-proxy
    fi
}

stop() {
    echo -n $"Stopping $prog: "
    killproc -p $PROXY_PID -d 3 $prog
    RETVAL=$?
    echo
    if [ $RETVAL -eq 0 ]; then
        rm -f /var/lock/subsys/mysql-proxy
        rm -f $PROXY_PID
    fi
}
# See how we were called.
case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    restart)
        stop
        start
        ;;
    condrestart|try-restart)
        if status -p $PROXY_PIDFILE $prog >&/dev/null; then
            stop
            start
        fi
        ;;
    status)
        status -p $PROXY_PID $prog
        ;;
    *)
        echo "Usage: $0 {start|stop|restart|reload|status|condrestart|try-restart}"
        RETVAL=1
        ;;
esac

exit $RETVAL
EOF
 
  
chmod 700 /etc/init.d/mysql-proxy
 
  
9. 重启mysql-proxy
 
  
/etc/init.d/mysql-proxy restart
 
  
10.检查启动结果
 
  
[root@mysql-proxy application]# netstat -nltpo
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name  
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      971/sshd          
tcp        0      0 0.0.0.0:4040                0.0.0.0:*                   LISTEN      1396/mysql-proxy  
tcp        0      0 0.0.0.0:4041                0.0.0.0:*                   LISTEN      1396/mysql-proxy  
tcp        0      0 :::22                       :::*                        LISTEN      971/sshd
 
  
说明： 4040 是mysql-proxy 本身监听的端口
 
  
       4040 是mysql-proxy 管理模块监听的端口
 
  
11.此时登陆管理模块，查看后端状态
 
  
mysql -uroot -P 4040 -p -h192.168.0.101 -e "select user,host from mysql.user"
mysql> select * from backends;
+-------------+--------------------+---------+------+------+-------------------+
| backend_ndx | address            | state   | type | uuid | connected_clients |
+-------------+--------------------+---------+------+------+-------------------+
|           1 | 192.168.0.102:3306 | unknown | rw   | NULL |                 0 |
|           2 | 192.168.0.103:3306 | unknown | ro   | NULL |                 0 |
+-------------+--------------------+---------+------+------+-------------------+
2 rows in set (0.00 sec)
 
  
#由于此时没有进行任何操作，所以主从状态都是unknown
 
  
12.执行查询操作，查看主从状态变化
 
  
mysql -uroot -P 4040 -p -h192.168.0.101 -e "show databases;"
mysql> select * from backends;
+-------------+--------------------+---------+------+------+-------------------+
| backend_ndx | address            | state   | type | uuid | connected_clients |
+-------------+--------------------+---------+------+------+-------------------+
|           1 | 192.168.0.102:3306 | up      | rw   | NULL |                 0 |
|           2 | 192.168.0.103:3306 | unknown | ro   | NULL |                 0 |
+-------------+--------------------+---------+------+------+-------------------+
2 rows in set (0.00 sec)
 
  
# 由于主是支持读写的，所以发现主状态变为了up是正常现象，要想观看到从的状态，需要多次查询
 
  
mysql -uroot -P 4040 -p -h192.168.0.101 -e "select user,host from mysql.user"
mysql> select * from backends;
+-------------+--------------------+-------+------+------+-------------------+
| backend_ndx | address            | state | type | uuid | connected_clients |
+-------------+--------------------+-------+------+------+-------------------+
|           1 | 192.168.0.102:3306 | up    | rw   | NULL |                 0 |
|           2 | 192.168.0.103:3306 | up    | ro   | NULL |                 0 |
+-------------+--------------------+-------+------+------+-------------------+
2 rows in set (0.00 sec)
 
  
#此时发现主从状态全部变成了up状态