使用Mycat数据库中间件实现MYSQL读写分离步骤

1. mycat官网下载mycat，这里以1.5.1-RELEASE版本为例

2. 在conf文件夹下针对server.xml和server.xml文件进行读写分离的配置

2.1 配置schema.xml(主要配置数据库信息)

<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://org.opencloudb/" ><schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1"></schema><dataNode name="dn1" dataHost="localhost1" database="shop" /><dataHost name="localhost1" maxCon="1000" minCon="10" balance="3"writeType="0" dbType="mysql" dbDriver="native" switchType="-1"  slaveThreshold="100"><heartbeat>select 1</heartbeat><!-- can have multi write hosts --><writeHost host="master" url="127.0.0.1:3306" user="root" password="root"><!-- can have multi read hosts --><readHost host="slave1" url="127.0.0.1:3307" user="root" password="root" /><readHost host="slave2" url="127.0.0.1:3308" user="root" password="root" /></writeHost></dataHost>
</mycat:schema>

2.2 配置server.xml(主要配置用户及权限信息)

<?xml version="1.0" encoding="UTF-8"?>
<!-- - - Licensed under the Apache License, Version 2.0 (the "License"); - you may not use this file except in compliance with the License. - You may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0 - - Unless required by applicable law or agreed to in writing, software - distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the License for the specific language governing permissions and - limitations under the License. -->
<!DOCTYPE mycat:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://org.opencloudb/"><system><property name="defaultSqlParser">druidparser</property><!--  <property name="useCompression">1</property>--> <!--1为开启mysql压缩协议--><!-- <property name="processorBufferChunk">40960</property> --><!-- <property name="processors">1</property> <property name="processorExecutor">32</property> --><!--默认是65535 64K 用于sql解析时最大文本长度 --><!--<property name="maxStringLiteralLength">65535</property>--><!--<property name="sequnceHandlerType">0</property>--><!--<property name="backSocketNoDelay">1</property>--><!--<property name="frontSocketNoDelay">1</property>--><!--<property name="processorExecutor">16</property>--><!-- <property name="mutiNodeLimitType">1</property> 0：开启小数量级（默认） ；1：开启亿级数据排序<property name="mutiNodePatchSize">100</property> 亿级数量排序批量<property name="processors">32</property> <property name="processorExecutor">32</property> <property name="serverPort">8066</property> <property name="managerPort">9066</property> <property name="idleTimeout">300000</property> <property name="bindIp">0.0.0.0</property> <property name="frontWriteQueueSize">4096</property> <property name="processors">32</property> --></system><user name="test"><property name="password">test</property><property name="schemas">TESTDB</property></user><user name="user"><property name="password">user</property><property name="schemas">TESTDB</property><property name="readOnly">true</property></user><!-- <quarantine> <whitehost><host host="127.0.0.1" user="mycat"/><host host="127.0.0.2" user="mycat"/></whitehost><blacklist check="false"></blacklist></quarantine>--></mycat:server>

3. 启动mycat

4. 通过命令mysql -uuser -puser -P8066连接mycat，查看mycat状态