Mysql读写分离

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实现了主从复制后，下面我们进行读写分离的安装与配置。环境说明：

Linux发行版本：centos 6.7 x86_64 （三台）

Hostname	IP	备注
mysql-master	192.168.0.109	主MySQL
mysql-slaver	192.168.0.110	从MySQL
mysql-proxy	192.168.0.104	调度服务器

以下所有操若未特殊说明，都是在 mysql-proxy 机器上操作。

1、安装所需软件包

由于mysql-proxy实际上并不需要在本机上运行MySQL实例，所以这里用yum安装

[iyunv@proxy ~]# yum install -y gcc gcc-c++ autoconf mysql-devel libtool pkgconfig ncurses ncurses-devel

2、安装libevent-2.0.22

[iyunv@proxy ~]# cd /usr/local/src/

[iyunv@proxy src]# wget https://github.com/libevent/libe ... .0.22-stable.tar.gz

[iyunv@proxy src]# tar xvf libevent-2.0.22-stable.tar.gz

[iyunv@proxy src]# cd libevent-2.0.22-stable

[iyunv@proxy libevent-2.0.22-stable]# ./configure

[iyunv@proxy libevent-2.0.22-stable]# make

[iyunv@proxy libevent-2.0.22-stable]# make install

3、安装glib-2.20.4

[iyunv@proxy src]# wget http://ftp.gnome.org/pub/gnome/s ... /glib-2.20.4.tar.gz

[iyunv@proxy src]# tar xvf glib-2.20.4.tar.gz

[iyunv@proxy src]# cd glib-2.20.4

[iyunv@proxy glib-2.20.4]# ./configure

[iyunv@proxy glib-2.20.4]# make

[iyunv@proxy glib-2.20.4]# make install

4、安装readline-6.1

[iyunv@proxy src]# wget http://ftp.gnu.org/gnu/readline/readline-6.1.tar.gz

[iyunv@proxy src]# tar xvf readline-6.1.tar.gz

[iyunv@proxy src]# cd readline-6.1

[iyunv@proxy readline-6.1]# ./configure

[iyunv@proxy readline-6.1]# make

[iyunv@proxy readline-6.1]# make install

[iyunv@proxy readline-6.1]# ldconfig -v          //让动态链接库为系统所共享

5、安装 lua-5.1.4

[iyunv@proxy src]# wget http://www.lua.org/ftp/lua-5.1.4.tar.gz

[iyunv@proxy src]# tar xvf lua-5.1.4.tar.gz

[iyunv@proxy src]# cd lua-5.1.4

[iyunv@proxy lua-5.1.4]# vim src/Makefile        //64位系统需加上 -fPIC

CFLAGS= -O2 -Wall -fPIC $(MYCFLAGS)

[iyunv@proxy lua-5.1.4]# make linux

[iyunv@proxy lua-5.1.4]# make install

验证是否安装成功

[iyunv@proxy lua-5.1.4]# /usr/local/lua/bin/lua

Lua 5.1.4  Copyright (C) 1994-2008 Lua.org, PUC-Rio

>

6、更改环境变量

[iyunv@proxy lua-5.1.4]# cp etc/lua.pc /usr/local/lib/pkgconfig/

[iyunv@proxy lua-5.1.4]# export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig

若版本为5.2以上则通过下面方式修改变量：

[iyunv@proxy lua-5.2.3]# vim /etc/profile                              //添加如下

export LUA_CFLAGS="-I/usr/local/lua/include" export LUA_LIBS="-L/usr/local/lua/lib-llua -ldl" export LDFLAGS="-L/usr/local/libevent/lib -lm" export CPPFLAGS="-I/usr/local/libevent/include" export CFLAGS="-I/usr/local/libevent/include"

[iyunv@proxy lua-5.2.3]# source /etc/profile

7、安装 mysql-proxy

[iyunv@proxy src]# wget http://mirrors.sohu.com/mysql/My ... -proxy-0.8.4.tar.gz

[iyunv@proxy src]# tar xvf mysql-proxy-0.8.4.tar.gz

[iyunv@proxy src]# cd mysql-proxy-0.8.4

[iyunv@proxy mysql-proxy-0.8.4]# ./configure -prefix=/usr/local/mysql-proxy

[iyunv@proxy mysql-proxy-0.8.4]# make

[iyunv@proxy mysql-proxy-0.8.4]# make install

[iyunv@proxy mysql-proxy-0.8.4]# cp lib/rw-splitting.lua /usr/local/lib/

[iyunv@proxy mysql-proxy-0.8.4]# cp lib/admin.lua /usr/local/lib/

8、新建配置文件

[iyunv@proxy src]# vim /etc/mysql-proxy.cnf

[mysql-proxy] admin-username = root admin-password = 123456 admin-lua-script = /usr/local/lib/admin.lua proxy-read-only-backend-addresses = 192.168.0.110 proxy-backend-addresses = 192.168.0.109 proxy-lua-script = /usr/local/lib/rw-splitting.lua log-file = /var/log/mysql-proxy.log log-level = debug daemon = true keepalive = true

[iyunv@proxy src]# chmod 660 /etc/mysql-proxy.cnf

说明：

admin-username ：指定登入的用户名 admin-password ：指定登入的密码 admin-lua-script ：指定由admin插件执行的脚本 proxy-address = <ip:port> ：mysql-proxy服务端的监听端口，默认是4040，建议改成3306 proxy-read-only-backend-addresses = <ip:port> ：指定只读slave的地址和端口，若有多个slave，以逗号分隔 proxy-backend-addresses = <ip:port> ：指定远程master的地址和端口，若不指定默认是127.0.0.1:3306 proxy-lua-script ：指定一个Lua脚本来控制mysql-proxy的运行和配置 defaults-file ：指定mysql-proxy配置文件 log-file ：指定日志文件 log-level ：指定日志级别 daemon = true ：指定mysql-proxy以守护进程方式运行 keepalive = true ：开启该功能修正以前mysql-proxy容易死掉的bug

9、给用户授权

在主MySQL执行：

mysql> grant all privileges on *.* to 'proxyuser'@'192.168.0.104' identified by '123456' with grant option;

在从MySQL执行：

mysql> grant all privileges on *.* to 'proxyuser'@'192.168.0.104' identified by '123456' with grant option;

10、编辑读写分离脚本

[iyunv@proxy src]# vim /usr/local/lib/rw-splitting.lua

找到： min_idle_connections = 4, max_idle_connections = 8, 改为： min_idle_connections = 1, max_idle_connections = 2,

说明：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。

11、启动mysql-proxy

[iyunv@proxy src]# /usr/local/mysql-proxy/bin/mysql-proxy -P 192.168.0.104:3306 --defaults-file=/etc/mysql-proxy.cnf

12、测试读写分离

[iyunv@proxy src]# netstat -lnp                                 //查看已启动 mysql-proxy 服务

[iyunv@proxy src]# tail /var/log/mysql-proxy.log    //查看日志文件，如下表示成功

2016-04-14 22:32:11: (message) chassis-unix-daemon.c:136: [angel] we try to keep PID=56545 alive 2016-04-14 22:32:11: (debug) chassis-unix-daemon.c:157: waiting for 56545 2016-04-14 22:32:11: (debug) chassis-unix-daemon.c:121: we are the child: 56545 2016-04-14 22:32:11: (critical) plugin proxy 0.8.4 started 2016-04-14 22:32:11: (debug) max open file-descriptors = 1024 2016-04-14 22:32:11: (message) proxy listening on port 192.168.0.104:3306 2016-04-14 22:32:11: (message) added read/write backend: 192.168.0.109 2016-04-14 22:32:11: (message) added read-only backend: 192.168.0.110

注意：MySQL Proxy服务启动后，我们可以看到网站页面全是乱码，所以要将主从数据库的配置文件都要加上如下代码以避免这个问题

# vim /etc/my.cnf

[mysqld]

skip-character-set-client-handshake init-connect = 'SET NAMES utf8'

default-character-set = utf8