MySQL-proxy 读写分离

目录

第一章 mysql-proxy软件实现数据库读写分离...... 1

1 MySQL Proxy......1

2 读写分离架构...... 1

3 部署...... 1

4 安装软件...... 1

4.1 安装基础依赖包......1

4.2 其他软件包...... 1

4.3 安装mysql-proxy...... 2

5 mysql-master端操作......3

第二章 遇见的问题总结..... 3 

第一章 mysql-proxy软件实现数据库读写分离

机器:192.168.21.139

完成实战之前的必要条件:主从复制环境搭建好。

MySQL Proxy

MySQL Proxy是一个处于你的Client端和MySQL server端之间的简单程序,它可以监测、分析或改变它们的通信。它使用灵活,没有限制,常见的用途包括:负载平衡,故障、查询分析,查询过滤和修改等等。

MySQL Proxy就是这么一个中间层代理,简单的说,MySQL Proxy就是一个连接池,负责将前台应用的连接请求转发给后台的数据库,并且通过使用lua脚本,可以实现复杂的连接控制和过滤,从而实现读写分离和负载平衡。对于应用来说,MySQLProxy是完全透明的,应用则只需要连接到MySQL Proxy的监听端口即可。当然,这样proxy机器可能成为单点失效,但完全可以使用多个proxy机器做为冗余,在应用服务器的连接池配置中配置到多个proxy的连接参数即可。

MySQL Proxy更强大的一项功能是实现“读写分离”,基本原理是让主数据库处理事务性查询,让从库处理SELECT查询。数据库复制被用来把事务性查询导致的变更同步到集群中的从库。

读写分离架构

wKioL1f7lySRdfunAAJ896hVKDk223.jpg-wh_50

部署

主机名

IP地址

系统版本

mysql-proxy

192.168.21.139

CentOS release  6.4 (Final) 2.6.32-431.el6.x86_64

mysql-master

192.168.21.135

CentOS release  6.4 (Final) 2.6.32-431.el6.x86_64

mysql-slave

192.168.21.135

CentOS release  6.4 (Final) 2.6.32-431.el6.x86_64

4安装软件

4.1安装基础依赖包

yum -y install gcc gcc-c++autoconf libevent-devel pkgconfig libtool mysql-devel

4.2其他软件包 

[root@zyl tools]# wget http://ftp.gnome.org/pub/gnome/sources/glib/2.22/glib-2.22.5.tar.gz

tar xf glib-2.22.5.tar.gz

cd glib-2.22.5

./configure--prefix=/usr/local/glib-2.22.5

make && make install

echo $?

wget http://www.lua.org/ftp/lua-5.1.4.tar.gz

tar xf lua-5.1.4.tar.gz

cd lua-5.1.4

sed -i's#^INSTALL_TOP=.*#INSTALL_TOP= /usr/local/lua-5.1.4#gi' ./Makefile

sed -i 's#^CFLAGS=.*#CFLAGS= -02-fPIC -Wall $(MYCFLAGS)#gi' ./src/Makefile

make linux install

echo  $?

4.3安装mysql-proxy

tar xf mysql-proxy-0.8.5-linux-glibc2.3-x86-64bit.tar.gz

cdmysql-proxy-0.8.5-linux-glibc2.3-x86-64bit

cd ..

cp -amysql-proxy-0.8.5-linux-glibc2.3-x86-64bit mysql-proxy

mv mysql-proxy /application/

cd /application/

ls

pkill mysql

netstat -lnput|grep 330

cd mysql

cd ../mysql-proxy/

ls

mkdir conf

mkdir logs

ls

cd ./conf/

ls

#添加到PATH环境变量

echo 'exportPATH=$PATH:/application/mysql-proxy/bin/' >>/etc/profile

tail -1 /etc/profile

source /etc/profile

which mysql-proxy

/application/mysql-proxy/bin/mysql-proxy--help

vim ./mysql-proxy.cnf

#############################################

简单一个配置(192.168.21.135:单机多实例)

[mysql-proxy]

plugins=admin,proxy

admin-username=admin

admin-password=admin

admin-lua-script=/application/mysql-proxy/lib/mysql-proxy/lua/admin.lua

proxy-backend-addresses=192.168.21.135:3306    èmaster

proxy-read-only-backend-addresses=192.168.21.135:3308èslave

proxy-lua-script=/application/mysql-proxy/share/doc/mysql-proxy/rw-splitting.lua

log-level=debug   日志的级别

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

daemon=true   以守护进程模式启动mysql-proxy;

log-file=/application/mysql-proxy/logs/proxy.log

##########################

chmod 0660 mysql-proxy.cnf

启动:

/application/mysql-proxy/bin/mysql-proxy--defaults-file=/application/mysql-proxy/conf/mysql-proxy.cnf

cat logs/proxy.log

[root@zyl tools]# netstat -lnpt|grep mysql-proxy

tcp        0     0 0.0.0.0:4040               0.0.0.0:*                  LISTEN      4261/mysql-proxy   

tcp        0     0 0.0.0.0:4041                0.0.0.0:*                   LISTEN      4261/mysql-proxy 

4040是proxy端口;4041是admin端口,也就是管理。

5 mysql-master端操作

mysqlgrant all on *.* to 'zyl'@'192.168.21.139' identified by '888666';

mysql> flush privileges

##########################

多开几个终端,测试连接:

[root@zyl -master ]# mysql -u zyl -p -h 192.168.21.139 --port 4040

[root@zyl mysql-proxy]# mysql-uadmin -P4041 -h 192.168.21.139 -padmin

mysql> select * from help;

+------------------------+------------------------------------+

| command                | description                        |

+------------------------+------------------------------------+

| SELECT * FROM help     | shows this help                    |

| SELECT * FROM backends | liststhe backends and their state |

+------------------------+------------------------------------+

2 rows in set (0.00 sec)

mysql> SELECT * FROM backends;

+-------------+---------------------+---------+------+------+-------------------+

| backend_ndx | address             | state   | type | uuid | connected_clients |

+-------------+---------------------+---------+------+------+-------------------+

|           1 | 192.168.21.135:3306 | unknown | rw   |NULL |                 0 |

|           2 | 192.168.21.135:3308 | unknown | ro  | NULL |                 0 |

+-------------+---------------------+---------+------+------+-------------------+

最终结果:

mysql> select * frombackends;

+-------------+-------------------+-------+------+------+-------------------+

| backend_ndx | address           | state | type | uuid |connected_clients |

+-------------+-------------------+-------+------+------+-------------------+

|           1 |192.168.21.135:3306 | up    | rw   | NULL |                 0 |

|           2 |192.168.21.135:3308 | up    | ro   | NULL |                 0 |

+-------------+-------------------+-------+------+------+-------------------+

2 rows in set (0.00 sec)

##出现两个up,那么分离成功了。

第二章遇见的问题总结

1.

[root@zyl lua-5.1.4]# make linuxinstall

cd src && make linux

make[1]: Entering directory`/home/tools/lua-5.1.4/src'

make allMYCFLAGS=-DLUA_USE_LINUX MYLIBS="-Wl,-E -ldl -lreadline -lhistory-lncurses"

make[2]: Entering directory`/home/tools/lua-5.1.4/src'

gcc -O2 -Wall  -fPIC -DLUA_USE_LINUX    -c -o lua.o lua.c

在包含自 lua.h:16 的文件中,

                 从 lua.c:15:

luaconf.h:275:31: 错误:readline/readline.h:没有那个文件或目录

luaconf.h:276:30: 错误:readline/history.h:没有那个文件或目录

lua.c: 在函数‘pushline’中:

lua.c:182: 警告:隐式声明函数‘readline’

lua.c:182: 警告:赋值时将整数赋给指针,未作类型转换

lua.c: 在函数‘loadline’中:

lua.c:210: 警告:隐式声明函数‘add_history’

make[2]: *** [lua.o] 错误 1

make[2]: Leaving directory`/home/tools/lua-5.1.4/src'

make[1]: *** [linux] 错误 2

make[1]: Leaving directory`/home/tools/lua-5.1.4/src'

make: *** [linux] 错误 2

解决:

yum installlibtermcap-devel ncurses-devel libevent-devel readline-devel

-------------------------------------------------------------------------------------------

2.

[root@zyl tools]# mysql -u zyl  -p -h 192.168.21.139 --port 4040      

ERROR 1105 (HY000): #07000MySQLProxy Lua script failed to load. Check the error log.

解决:

[root@zyl lua]# pkillmysql-proxy 

[root@zyl lua]# cp./mysql-proxy-0.8.5-linux-glibc2.3-x86-64bit/share/doc/mysql-proxy/rw-splitting.lua/opt/mysql-proxy/lib/mysql-proxy/lua/

[root@zyl lua]# vim/opt/mysql-proxy/init.d/mysql-proxy 

更改脚本:

检查这个脚本:--proxy-lua-script=/opt/mysql-proxy/lib/mysql-proxy/lua/rw-splitting.lua"

-------------------------------------------------------------------------------------------

3.

[root@zyl lua]# mysql -u zyl  -p -h 192.168.21.139 --port 4040

注:因为rw-splitting.lua脚本默认有4个链接才启用分离;所以多开启几个终端;多测试几下;你也可以去修改里面的相关值;

wKioL1f7mB6D6bnkAAD78fZbcCI167.png

改rw-splitting.lua读写分离脚本如下参数:

wKioL1f7mD7AATNvAAAd91BBZ3o912.png

 

4.编译glib时报错

configure: error:

*** You must have either havegettext support in your C library, or use the

*** GNU gettext library.(http://www.gnu.org/software/gettext/gettext.html

解决:

[root@zyl glib-2.22.5]# yum  install -y gettext

-------------------------------------------------------------------------------------------

5.

[root@zyl conf]#/application/mysql-proxy/bin/mysql-proxy--defaults-file=/application/mysql-proxy/conf/mysql-proxy.cnf  

2016-09-02 22:28:37: (critical)mysql-proxy-cli.c:326: loading config from'/application/mysql-proxy/conf/mysql-proxy.cnf' failed: permissions of/application/mysql-proxy/conf/mysql-proxy.cnf aren't secure (0660 or stricter required)

2016-09-02 22:28:37: (message)Initiating shutdown, requested from mysql-proxy-cli.c:328

2016-09-02 22:28:37: (message) shuttingdown normally, exit code is: 1

解决:

[root@zyl mysql-proxy]# chmod0660 mysql-proxy.cnf

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