基於mysql-proxy讀寫分離

標籤：mysql-proxy   mysql讀寫分離   

一、可以使用rpm包安裝，需要安裝epel軟體包庫，或者直接從官網下載rpm包；

二、安裝配置mysql-proxy:

650) this.width=650;" title="mysql-master-salve-proxy.jpg" alt="wKiom1Tl5ByRPughAAIPgA9lPVw679.jpg" src="http://s3.51cto.com/wyfs02/M00/59/CF/wKiom1Tl5ByRPughAAIPgA9lPVw679.jpg" />

2.1 下載所需要的版本，這裡的系統平台為rhel6.4 32位系統，因此就以mysql-proxy-0.8.1-linux-glibc2.3-x86-32bit.tar.gz為例。

# tar xf mysql-proxy-0.8.1-linux-glibc2.3-x86-32bit.tar.gz -C /usr/local

# cd /usr/local

# ln -sv mysql-proxy-0.8.1-linux-glibc2.3-x86-32bit  mysql-proxy

添加代理使用者

# useradd mysql-proxy

2.2 為mysql-proxy提供SysV服務指令碼，內容如下所示

#!/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="/usr/local/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="/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua"

PROXY_OPTIONS="--daemon"

PROXY_PID=/var/run/mysql-proxy.pid

PROXY_USER="mysql-proxy"

# 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_PASSWORD"

    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

將上述內容儲存為/etc/rc.d/init.d/mysql-proxy，給予執行許可權，而後加入到服務列表。

# chmod +x /etc/rc.d/init.d/mysql-proxy

# chkconfig --add mysql-proxy

2.3 為服務指令碼提供設定檔/etc/sysconfig/mysql-proxy，內容如下所示：

# Options for mysql-proxy 

ADMIN_USER="admin"

ADMIN_PASSWORD="admin"

ADMIN_ADDRESS=""

ADMIN_LUA_SCRIPT="/usr/local/mysql-proxy/share/doc/mysql-proxy/admin.lua"

PROXY_ADDRESS=""

PROXY_USER="mysql-proxy"

PROXY_OPTIONS="--daemon --log-level=info --log-use-syslog"

其中最後一行，需要按實際情境進行修改，例如：

PROXY_OPTIONS="--daemon --log-level=info --log-use-syslog --plugins=proxy --plugins=admin --proxy-backend-addresses=192.168.1.21:3306 --proxy-read-only-backend-addresses=192.168.1.211:3306 --proxy-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua"

其中的proxy-backend-addresses選項和proxy-read-only-backend-addresses選項均可重複使用多次，以實現指定多個讀寫伺服器或唯讀伺服器。

2.4 mysql-proxy的配置選項

mysql-proxy的配置選項大致可分為協助選項、管理選項、代理選項及應用程式選項幾類，下面一起去介紹它們。

--help

--help-admin

--help-proxy

--help-all ———— 以上四個選項均用於擷取協助資訊；

--proxy-address=host:port ———— 代理服務監聽的地址和連接埠；

--admin-address=host:port ———— 管理模組監聽的地址和連接埠；

--proxy-backend-addresses=host:port ———— 後端mysql伺服器的地址和連接埠；

--proxy-read-only-backend-addresses=host:port ———— 後端唯讀mysql伺服器的地址和連接埠；

--proxy-lua-script=file_name ———— 完成mysql代理功能的Lua指令碼；

--daemon ———— 以守護進程模式啟動mysql-proxy；

--keepalive ———— 在mysql-proxy崩潰時嘗試重啟之；

--log-file=/path/to/log_file_name ———— 記錄檔名稱；

--log-level=level ———— 記錄層級；

--log-use-syslog ———— 基於syslog記錄日誌；

--plugins=plugin,.. ———— 在mysql-proxy啟動時載入的外掛程式；

--user=user_name ———— 運行mysql-proxy進程的使用者；

--defaults-file=/path/to/conf_file_name ———— 預設使用的設定檔路徑；其配置段使用[mysql-proxy]標識；

--proxy-skip-profiling ———— 禁用profile；

--pid-file=/path/to/pid_file_name ———— 進程檔案名稱；

3、複製如下內容建立admin.lua檔案，將其儲存至/usr/local/mysql-proxy/share/doc/mysql-proxy/目錄中。

--[[ $%BEGINLICENSE%$

 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

4、測試

4.1 管理功能測試

# mysql -uadmin -padmin -192.168.1.22 --port=4041 

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 1

Server version: 5.0.99-agent-admin

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the buffer.

mysql> SELECT * FROM backends;

+-------------+--------------------+---------+------+------+-------------------+
| backend_ndx | address            | state   | type | uuid | connected_clients |
+-------------+--------------------+---------+------+------+-------------------+
|           1 | 192.168.1.21:3306  | up      | rw   | NULL |                 0 |
|           2 | 192.168.1.211:3306 | unknown | ro   | NULL |                 0 |
+-------------+--------------------+---------+------+------+-------------------+
2 rows in set (0.00 sec)

4.2 讀寫分離測試

# mysql -uroot  -h192.168.1.22 --port=4040 -p

本文出自 “水滴石穿” 部落格，請務必保留此出處http://wangzan18.blog.51cto.com/8021085/1614918

基於mysql-proxy讀寫分離