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网上看到一个读写分离的帖子,感觉不错!!

构建高性能web之路------mysql读写分离实战(转)

一个完整的mysql读写分离环境包括以下几个部分:

应用程序client

database proxy

database集群

在本次实战中,应用程序client基于c3p0连接后端的database proxy。database proxy负责管理client实际访问database的路由策略,采用开源框架amoeba。database集群采用mysql的master-slave的replication方案。整个环境的结构图如下所示:

实战步骤与详解

一.搭建mysql的master-slave环境

1)分别在host1(10.20.147.110)和host2(10.20.147.111)上安装mysql(5.0.45),具体安装方法可见官方文档

2)配置master

首先编辑/etc/my.cnf,添加以下配置:

log-bin=mysql-bin #slave会基于此log-bin来做replication

server-id=1 #master的标示

binlog-do-db = amoeba_study #用于master-slave的具体数据库

然后添加专门用于replication的用户:

mysql> GRANT REPLICATION SLAVE ON *.* TO repl@10.20.147.111 IDENTIFIED BY '111111';

重启mysql,使得配置生效:

/etc/init.d/mysqld restart

最后查看master状态:

3)配置slave

首先编辑/etc/my.cnf,添加以下配置:

server-id=2 #slave的标示

配置生效后,配置与master的连接:

mysql> CHANGE MASTER TO

    -> MASTER_HOST='10.20.147.110',

    -> MASTER_USER='repl',

    -> MASTER_PASSWORD='111111',

    -> MASTER_LOG_FILE='mysql-bin.000003',

    -> MASTER_LOG_POS=161261;

其中MASTER_HOST是master机的ip,MASTER_USER和MASTER_PASSWORD就是我们刚才在master上添加的用户,MASTER_LOG_FILE和MASTER_LOG_POS对应与master status里的信息

最后启动slave:

mysql> start slave;

4)验证master-slave搭建生效

通过查看slave机的log(/var/log/mysqld.log):

100703 10:51:42 [Note] Slave I/O thread: connected to master 'repl@10.20.147.110:3306',  replication started in log 'mysql-bin.000003' at position 161261

如看到以上信息则证明搭建成功,如果有问题也可通过此log找原因

二.搭建database proxy

此次实战中database proxy采用amoeba ,它的相关信息可以查阅官方文档,不在此详述

1)安装amoeba

下载amoeba(1.2.0-GA)后解压到本地(D:/openSource/amoeba-mysql-1.2.0-GA),即完成安装

2)配置amoeba

先配置proxy连接和与各后端mysql服务器连接信息(D:/openSource/amoeba-mysql-1.2.0-GA/conf/amoeba.xml):

 

     

    8066 

     

     

     

     

    20 

     

     

    30 

     

     

    30 

     

     

    128 

     

     

    true 

     

     

    root 

     

     

    root 

 

以上是proxy提供给client的连接配置

 

              

         

         

            defaultManager 

             

             

            3306 

             

             

            10.20.147.110 

            amoeba_study 

             

             

            root 

             

             

             

             

         

         

         

         

            200 

            200 

            10 

            600000 

            600000 

            true 

            true 

         

     

     

         

         

         

            defaultManager 

             

             

            3306 

             

             

            10.20.147.111 

            amoeba_study 

             

             

            root 

             

             

             

             

         

         

         

         

            200 

            200 

            10 

            600000 

            600000 

            true 

            true 

         

            

 

以上是proxy与后端各mysql数据库服务器配置信息,具体配置见注释很明白了

最后配置读写分离策略:

 

    1500 

    server1 

    server1 

    server2 

    true 

 

从以上配置不然发现,写操作路由到server1(master),读操作路由到server2(slave)

3)启动amoeba

在命令行里运行D:/openSource/amoeba-mysql-1.2.0-GA/amoeba.bat即可:

log4j:WARN log4j config load completed from file:D:/openSource/amoeba-mysql-1.2.0-GA/conf/log4j.xml

log4j:WARN ip access config load completed from file:D:/openSource/amoeba-mysql-1.2.0-GA/conf/access_list.conf

2010-07-03 09:55:33,821 INFO  net.ServerableConnectionManager - Server listening on 0.0.0.0/0.0.0.0:8066.

三.client端调用与测试

1)编写client调用程序

具体程序细节就不详述了,只是一个最普通的基于mysql driver的jdbc的数据库操作程序

2)配置数据库连接

本client基于c3p0,具体数据源配置如下:

    destroy-method="close"> 

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

 

值得注意是,client端只需连到proxy,与实际的数据库没有任何关系,因此jdbcUrl、user、password配置都对应于amoeba暴露出来的配置信息

3)调用与测试

首先插入一条数据:insert into zone_by_id(id,name) values(20003,'name_20003')

通过查看master机上的日志/var/lib/mysql/mysql_log.log:

100703 11:58:42       1 Query       set names latin1

                      1 Query       SET NAMES latin1

                      1 Query       SET character_set_results = NULL

                      1 Query       SHOW VARIABLES

                      1 Query       SHOW COLLATION

                      1 Query       SET autocommit=1

                      1 Query       SET sql_mode='STRICT_TRANS_TABLES'

                      1 Query       SHOW VARIABLES LIKE 'tx_isolation'

                      1 Query       SHOW FULL TABLES FROM `amoeba_study` LIKE 'PROBABLYNOT'

                      1 Prepare     [1] insert into zone_by_id(id,name) values(?,?)

                      1 Prepare     [2] insert into zone_by_id(id,name) values(?,?)          

                      1 Execute     [2] insert into zone_by_id(id,name) values(20003,'name_20003')

得知写操作发生在master机上

通过查看slave机上的日志/var/lib/mysql/mysql_log.log:

100703 11:58:42       2 Query       insert into zone_by_id(id,name) values(20003,'name_20003')

得知slave同步执行了这条语句

然后查一条数据:select t.name from zone_by_id t where t.id = 20003

通过查看slave机上的日志/var/lib/mysql/mysql_log.log:

100703 12:02:00      33 Query       set names latin1

                     33 Prepare     [1] select t.name from zone_by_id t where t.id = ?

                     33 Prepare     [2] select t.name from zone_by_id t where t.id = ?   

                     33 Execute     [2] select t.name from zone_by_id t where t.id = 20003

得知读操作发生在slave机上

并且通过查看slave机上的日志/var/lib/mysql/mysql_log.log发现这条语句没在master上执行

通过以上验证得知简单的master-slave搭建和实战得以生效

 

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