Mysql集群主从复制及mysql-proxy读写分离

一、实验环境

    

master-masql	192.168.83.132
slave-mysql	192.168.83.133
mysql-proxy	192.168.83.134

二、安装mysql

1、安装包所需环境

 yum -y groupinstall "Development tools" "Server Platform Development"

 yum -y install libxml2-devel ncurses-devel openssl*

2、创建mysql用户

# mkdir -pv /mydata/data

# mkdir -pv /mydata/binlogs   (master上创建)

# mkdir -pv /mydata/realylogs  (slave上创建)

# groupadd -r mysql

# useradd -g mysql -r -s /sbin/nologin -M -d /mydata/data mysql

# chown -R mysql:mysql /mydata/data

3、安装mysql

# tar xf mysql-5.5.33-linux2.6-i686.tar.gz -C /usr/local

# cd /usr/local/

# ln -sv mysql-5.5.33-linux2.6-i686  mysql

# cd mysql 

# chown -R mysql:mysql  ./*

# scripts/mysql_install_db --user=mysql --datadir=/mydata/data

# chown -R root  ./*

4、为mysql提供主配置文件：

# cd /usr/local/mysql

# cp support-files/my-large.cnf  /etc/my.cnf

5、修改配置文件

  vim /etc/my.cnf  （master服务器） 

 datadir = /mydata/data    ##添加

 log-bin=/mydata/binlogs/master-bin       ##修改日志路径

 

 vim /etc/my.cnf  （slave服务器）

datadir = /mydata/data

relay-log = /mydata/realylogs/relay-log   ##开启中继日志

#log-bin=mysql-bin                        ##禁用二进制日志

#binlog_format=mixed

server-id       = 10

6、为mysql提供sysv服务脚本：

# cd /usr/local/mysql

# cp support-files/mysql.server  /etc/rc.d/init.d/mysqld

# chmod +x /etc/rc.d/init.d/mysqld

7、添加至服务列表：

# chkconfig --add mysqld

# chkconfig mysqld on

8、输出mysql的库文件给系统库查找路径：

# echo '/usr/local/mysql/lib' > /etc/ld.so.conf.d/mysql.conf

9、修改PATH环境变量，让系统可以直接使用mysql的相关命令。具体实现过程这里不再给出。

 vim /etc/profile.d/mysqld.sh 

        export PATH=/usr/local/mysql/bin:$PATH

]# source /etc/profile.d/mysqld.sh  

# ldconfig

10、在master上创建具有复制权限的slave帐号并查看二进制日志起点

11、配置slave服务器

        

连接master:

 MariaDB [(none)]> HELP CHANGE MASTER TO

Name: 'CHANGE MASTER TO'

Syntax:

CHANGE MASTER TO option [, option] ...

        option:

MASTER_BIND = 'interface_name'

        | MASTER_HOST = 'host_name'    # 指明要连接的主节点，值类型字串

| MASTER_USER = 'user_name'    # 具有复制权限的账号，值类型为字串 

| MASTER_PASSWORD = 'password' # 上述用户的密码，值类型为字串 

| MASTER_PORT = port_num

| MASTER_CONNECT_RETRY = interval

| MASTER_HEARTBEAT_PERIOD = interval

| MASTER_LOG_FILE = 'master_log_name'  # 复制起点，主节点上二进制日志，值类型为字串

| MASTER_LOG_POS = master_log_pos  # 复制起点，主节点上二进制日志中起始事件的位置，值类型为数值

12、测试主从复制是否成功

    

三、配置读写分离

1、创建用户并安装

[root@70sec /]# yum -y install mysql  （只需安装客户端即可，无需启动）

[root@70sec src]# useradd mysql-proxy

[root@70sec src]# tar xf mysql-proxy-0.8.3-linux-glibc2.3-x86-64bit.tar.gz -C /usr/local/

[root@70sec src]# cd /usr/local/

[root@70sec local]# ln -sv mysql-proxy-0.8.3-linux-glibc2.3-x86-64bit/ mysql-proxy

`mysql-proxy' -> `mysql-proxy-0.8.3-linux-glibc2.3-x86-64bit/'

 

2、为mysql-proxy提供SysV服务脚本，并设置环境变量

[root@70sec local]# vim /etc/rc.d/init.d/mysql-proxy

#!/bin/bash

# mysql-proxy This script starts and stops the mysql-proxy daemon

#

# 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: "

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

[root@70sec local]# chkconfig --add mysql-proxy

[root@70sec local]# chkconfig mysql-proxy on 

3、为服务脚本提供配置文件/etc/sysconfig/mysql-proxy

[root@70sec mysql-proxy]# vim share/doc/mysql-proxy/admin.lua 

# 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 --plugins=proxy --plugins=admin --proxy-backend-addresses=192.168.83.132:3306 --proxy-read-only-backend-addresses=192.168.83.133:3306 --proxy-lua-script=/usr/local/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua"

4、创建admin管理脚本

[root@70sec local]# vim share/doc/mysql-proxy/admin.lua

--[[ $%BEGINLICENSE%$

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

5、启动服务并查看

  [root@70sec mysql-proxy]# service mysql-proxy start

Starting /usr/local/mysql-proxy/bin/mysql-proxy:           [  OK  ]

[root@70sec mysql-proxy]# ss -anlpt

State      Recv-Q Send-Q                 Local Address:Port                   Peer Address:Port                            :::*     

LISTEN     0      128                                *:4041                              *:*      users:(("mysql-proxy",27609,11))

LISTEN     0      128                                *:3306                              *:*      users:(("mysql-proxy",27609,10))

6、管理功能测试

7、在master上创建远程帐号

8、在mysql-proxy上测试

9、查看被谁写入

10、也可以通过抓包测试

[root@90sec mydata]# tcpdump -i eth0 -nn -XX dst host 192.168.83.132 and tcp dst port 3306

[root@90sec mydata]# tcpdump -i eth0 -nn -XX dst host 192.168.83.133 and tcp dst port 3306

mysql-proxy的配置选项大致可分为帮助选项、管理选项、代理选项及应用程序选项几类，下面一起去介绍它们。

--help

--help-admin

--help-proxy

--help-all ———— 以上四个选项均用于获取帮助信息；

--proxy-address=host:port ———— 代理服务监听的地址和端口；

--admin-address=host:port ———— 管理模块监听的地址和端口；

--proxy-backend-addresses=host:port ———— 后端mysql服务器的地址和端口；

--proxy-read-only-backend-addresses=host:port ———— 后端只读mysql服务器的地址和端口；

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

--daemon ———— 以守护进程模式启动mysql-proxy；

--keepalive ———— 在mysql-proxy崩溃时尝试重启之；

--log-file=/path/to/log_file_name ———— 日志文件名称；

--log-level=level ———— 日志级别；

--log-use-syslog ———— 基于syslog记录日志；

--plugins=plugin,.. ———— 在mysql-proxy启动时加载的插件；

--user=user_name ———— 运行mysql-proxy进程的用户；

--defaults-file=/path/to/conf_file_name ———— 默认使用的配置文件路径；其配置段使用[mysql-proxy]标识；

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

--pid-file=/path/to/pid_file_name ———— 进程文件名；