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一.MySQL读写分离
主数据库处理事务性查询,写分从数据库处理select查询。离基数据库复制用来把事务性查询导致的写分变更同步到从数据库中。
二.最为常见的离基读写分离有两种:
1.基于程序代码实现
在代码中根据select,insert进程路由分类;
优点:性能好,写分因为在代码中实现,离基不需要额外的写分硬件设备;
缺点:需要开发人员来实现,对代码改动比较大,离基不适合大型复杂应用;
2.基于代理层实现
MySQL-Proxy:隶属于MySQL开源项目;
Amoeba:Amoeba是写分一个以MySQL为底层数据存储,并对应用提供MySQL协议接口的离基proxy。它集中地响应应用的写分请求,依据用户事先设置的离基规则,将SQL请求发送到特定的写分数据库上执行。基于此可以实现负载均衡、离基读写分离、写分高可用性等需求;
三.实验环境
OS:CentOS 6.5 x64
Amoeba:192.168.0.128
master:192.168.0.134
slave:192.168.0.135
client:192.168.0.137
三.配置主从复制
1.MySQL读写分离是基于主从复制配置的,先配置好主从复制,再配置读写分离。
主从复制博文连接:http://guoxh.blog.51cto.com/10976315/1922643
2.添加授权账号供Amoeba访问
master和slave:
mysql> grant all on *.* to 'proxy'@'192.168.0.128' identified by '123456';Query OK, 0 rows affected (0.00 sec)mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)
四.Amoeba安装配置
1. Amoeba是基于JDK开发的,所有先安装JAVA环境
[root@amoeba ~]# chmod +x jdk-6u14-linux-x64.bin [root@amoeba ~]# ./jdk-6u14-linux-x64.bin [root@amoeba ~]# cat /etc/profile.d/java.sh export JAVA_HOME=/usr/local/jdk1.6export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/libexport PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/lib:$PATH:$HOME/bin[root@amoeba ~]# source /etc/profile.d/java.sh [root@amoeba ~]# java -versionjava version "1.6.0_14"Java(TM) SE Runtime Environment (build 1.6.0_14-b08)Java HotSpot(TM) 64-Bit Server VM (build 14.0-b16, mixed mode)#JAVA环境配置完成
2.安装Amoeba
[root@amoeba ~]# mkdir /usr/local/amoeba[root@amoeba ~]# tar xf amoeba-mysql-binary-2.2.0.tar.gz -C /usr/local/amoeba[root@amoeba ~]# ls /usr/local/amoeba/benchmark bin changelogs.txt conf lib LICENSE.txt README.html[root@amoeba ~]# cat /etc/profile.d/amoeba.sh export AMOEBA_HOME=/usr/local/amoeba/export PATH=$PATH:$AMOEBA_HOME/bin[root@amoeba ~]# source /etc/profile.d/amoeba.sh [root@amoeba ~]# /usr/local/amoeba/bin/amoebaamoeba start|stop # Amoeba安装成功
3.编辑amoeba.xml配置文件
[root@amoeba conf]# cd /usr/local/amoeba/conf/[root@amoeba conf]# cp amoeba.xml amoeba$(date +"%Y_%m_%d").xml #修改前备份一份[root@amoeba conf]# vim amoeba.xml27 <property name="authenticator">28 <bean class="com.meidusa.amoeba.mysql.server.MysqlClientAuthenticator">29 30 <property name="user">amoeba</property> #设置client连接的用户31 32 <property name="password">amoeba</property> #设置client连接的密码33 34 <property name="filter">35 <bean class="com.meidusa.amoeba.server.IPAccessController">36 <property name="ipFile">${ amoeba.home}/conf/access_list.conf</property>37 </bean>38 </property>39 </bean>40 </property>112 </property>113 <property name="sqlFunctionFile">${ amoeba.home}/conf/functionMap.xml</property>114 <property name="LRUMapSize">1500</property>115 <property name="defaultPool">master/property> #指定默认为master116 117 <!-- #删除注释118 <property name="writePool">master</property> #指定写操作为master119 <property name="readPool">slaves</property> #指定读操作为slave120 --> #删除注释121 <property name="needParse">true</property>
3.编辑dbServers.xml
25 <!-- mysql user -->26 <property name="user">proxy</property> #填mysql授权的用户27 28 <!-- mysql password -->29 <property name="password">123456</property> #填MySQL授权的用户密码30 45 <dbServer name="master" parent="abstractServer">46 <factoryConfig>47 <!-- mysql ip -->48 <property name="ipAddress">192.168.0.134</property> #指定master的IP49 </factoryConfig>50 </dbServer>51 52 <dbServer name="slave" parent="abstractServer">53 <factoryConfig>54 <!-- mysql ip -->55 <property name="ipAddress">192.168.0.135</property> #指定slave的IP56 </factoryConfig>57 </dbServer>58 <dbServer name="slaves" virtual="true">59 <poolConfig class="com.meidusa.amoeba.server.MultipleServerPool">60 <!-- Load balancing strategy: 1=ROUNDROBIN , 2=WEIGHTBASED , 3=HA-->61 <property name="loadbalance">1</property>62 63 <!-- Separated by commas,such as: server1,server2,server1 -->64 <property name="poolNames">slave</property>65 </poolConfig>66 </dbServer>
4.启动服务
[root@amoeba ~]# amoeba start &[1] 2666[root@amoeba ~]# log4j:WARN log4j config load completed from file:/usr/local/amoeba/conf/log4j.xml2017-05-07 00:42:16,692 INFO context.MysqlRuntimeContext - Amoeba for Mysql current versoin=5.1.45-mysql-amoeba-proxy-2.2.0log4j:WARN ip access config load completed from file:/usr/local/amoeba/conf/access_list.conf2017-05-07 00:42:17,064 INFO net.ServerableConnectionManager - Amoeba for Mysql listening on 0.0.0.0/0.0.0.0:8066.2017-05-07 00:42:17,067 INFO net.ServerableConnectionManager - Amoeba Monitor Server listening on /127.0.0.1:56460.[root@amoeba ~]# netstat -anptl | grep javatcp 0 0 ::ffff:127.0.0.1:56460 :::* LISTEN 2666/java tcp 0 0 :::8066 :::* LISTEN 2666/java tcp 0 0 ::ffff:192.168.0.128:37361 ::ffff:192.168.0.135:3306 ESTABLISHED 2666/java tcp 0 0 ::ffff:192.168.0.128:35241 ::ffff:192.168.0.134:3306 ESTABLISHED 2666/java #Amoeba默认端口为8066
五.测试
1.客户端连接Amoeba
[root@client ~]# mysql -uamoeba -p123456 -h 192.168.0.128 -P8066
2.新建一个数据库
mysql> create database guoxh;Query OK, 1 row affected (0.01 sec)mysql> show databases;+--------------------+| Database |+--------------------+| information_schema || aaa || guoxh || mysql || test |+--------------------+5 rows in set (0.01 sec)
3.master和slave查看数据库
mysql> show databases;+--------------------+| Database |+--------------------+| information_schema || aaa || guoxh | #刚建的数据库已经同步| mysql || test |+--------------------+5 rows in set (0.00 sec)
五.测试读写分离:
1.在master新建一个表,同步到slave上,然后关掉slave功能,在slave上插入区别语句
master:创建名为student的表
mysql> show tables;Empty set (0.00 sec)mysql> create table student (id int(10),name varchar(10),info varchar(50));Query OK, 0 rows affected (0.01 sec)mysql> show tables;+-----------------+| Tables_in_guoxh |+-----------------+| student |+-----------------+1 row in set (0.00 sec)
slave:停止同步
mysql> show tables;+-----------------+| Tables_in_guoxh |+-----------------+| student |+-----------------+1 row in set (0.00 sec)mysql> stop slave;Query OK, 0 rows affected (0.00 sec)
master:插入区别数据
mysql> insert into student values('1','zhangsan','Mysql_master');Query OK, 1 row affected (0.01 sec)mysql> select * from student;+------+----------+--------------+| id | name | info |+------+----------+--------------+| 1 | zhangsan | Mysql_master |+------+----------+--------------+1 row in set (0.00 sec)
slave:插入区别数据
mysql> select * from student;Empty set (0.00 sec)mysql> insert into student values('2','lisi','Mysql_slave');Query OK, 1 row affected (0.00 sec)mysql> select * from student;+------+------+-------------+| id | name | info |+------+------+-------------+| 2 | lisi | Mysql_slave |+------+------+-------------+1 row in set (0.00 sec)
3.测试读操作:
client:
mysql> show tables;+-----------------+| Tables_in_guoxh |+-----------------+| student |+-----------------+1 row in set (0.00 sec)mysql> select * from student;+------+------+-------------+| id | name | info |+------+------+-------------+| 2 | lisi | Mysql_slave |+------+------+-------------+1 row in set (0.00 sec)mysql> select * from student;+------+------+-------------+| id | name | info |+------+------+-------------+| 2 | lisi | Mysql_slave |+------+------+-------------+1 row in set (0.00 sec)
# 此时,读操作已经已经全部分配到slave上面。
4.测试写操作
client:插入一条数据,这里是看不到数据的,得到master查看
mysql> insert into student values('3','wangwu','Mysql_client');Query OK, 1 row affected (0.00 sec)mysql> select * from student;+------+------+-------------+| id | name | info |+------+------+-------------+| 2 | lisi | Mysql_slave |+------+------+-------------+1 row in set (0.00 sec)
master:
mysql> select * from student;+------+----------+--------------+| id | name | info |+------+----------+--------------+| 1 | zhangsan | Mysql_master || 3 | wangwu | Mysql_client |+------+----------+--------------+2 rows in set (0.00 sec)
#此时,写操作全部分给了master。
到此为止,MySQL已经实现了读写分离!
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