MySQL-Proxy实现读写分离部署文档

实验拓扑图:

wKiom1N-tzDwO7z6AAC4RD5zGcU752.jpg

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

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[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

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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

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

4.启动mysql-proxy

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[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

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[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

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# 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

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cat  >> /application/mysql-proxy/share/doc/mysql-proxy/admin.lua <<EOF
--[[ $%BEGINLICENSE%$
 Copyright (c) 2007, 2012, Oracle and/or  its affiliates. All rights reserved.
  
 This program is free  software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License as
 published by the Free Software Foundation; version 2 of the
 License.
  
 This program is distributed in  the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 GNU General Public License for  more  details.
  
 You should have received a copy of the GNU General Public License
 along with this program; if  not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 02110-1301  USA
  
 $%ENDLICENSE%$ --]]
  
function  set_error(errmsg) 
    proxy.response = {
        type  = proxy.MYSQLD_PACKET_ERR,
        errmsg = errmsg or "error"
    }
end
  
function  read_query(packet)
    if  packet:byte() ~= proxy.COM_QUERY then
        set_error("[admin] we only handle text-based queries (COM_QUERY)")
        return  proxy.PROXY_SEND_RESULT
    end
  
    local  query = packet:sub(2)
  
    local  rows = { }
    local  fields = { }
  
    if  query:lower() == "select * from backends"  then
        fields = { 
            { name = "backend_ndx"
              type  = proxy.MYSQL_TYPE_LONG },
  
            { name = "address",
              type  = proxy.MYSQL_TYPE_STRING },
            { name = "state",
              type  = proxy.MYSQL_TYPE_STRING },
            { name = "type",
              type  = proxy.MYSQL_TYPE_STRING },
            { name = "uuid",
              type  = proxy.MYSQL_TYPE_STRING },
            { name = "connected_clients"
              type  = proxy.MYSQL_TYPE_LONG },
        }
  
        for  i = 1, #proxy.global.backends do
            local  states = {
                "unknown",
                "up",
                "down"
            }
            local  types = {
                "unknown",
                "rw",
                "ro"
            }
            local  b = proxy.global.backends[i]
  
            rows[#rows + 1] = {
                i,
                b.dst.name,          -- configured backend address
                states[b.state + 1], -- the C-id  is pushed down starting at 0
                types[b.type  + 1],   -- the C-id  is pushed down starting at 0
                b.uuid,              -- the MySQL Server's UUID if  it is managed
                b.connected_clients  -- currently connected clients
            }
        end
    elseif query:lower() == "select * from help"  then
        fields = { 
            { name = "command"
              type  = proxy.MYSQL_TYPE_STRING },
            { name = "description"
              type  = proxy.MYSQL_TYPE_STRING },
        }
        rows[#rows + 1] = { "SELECT * FROM help", "shows this help" }
        rows[#rows + 1] = { "SELECT * FROM backends", "lists the backends and their state" }
    else
        set_error("use 'SELECT * FROM help' to see the supported commands")
        return  proxy.PROXY_SEND_RESULT
    end
  
    proxy.response = {
        type  = proxy.MYSQLD_PACKET_OK,
        resultset = {
            fields = fields,
            rows = rows
        }
    }
    return  proxy.PROXY_SEND_RESULT
end
EOF

8. 编辑mysql-proxy启动脚本

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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/nullthen
            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

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/etc/init.d/mysql-proxy  restart

10.检查启动结果

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[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

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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

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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

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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

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