基于mycat实现mysql的读写分离

tar -zvxf Mycat-server-1.6.7.3-release-20190828135747-linux.tar.gz

jps # 或者 java -version

    <schema name="TESTDB" checkSQLschema="true" sqlMaxLimit="100" dataNode="dn1">
	</schema>
		
	<dataNode name="dn1" dataHost="host1" database="test" />

	<!-- 
	 writeType="1"，所有写操作都随机的发送到配置的 writeHost
		3 基于 MySQL galary cluster 的切换机制（适合集群）（1.4.1）
	-->
	<dataHost name="host1" maxCon="1000" minCon="10" balance="3"
			  writeType="1" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
		<!-- 心跳检查 -->
		<heartbeat>select user()</heartbeat>
		<!-- 写节点的配置 -->
		<writeHost host="hostM1" url="192.168.142.26:3306" user="root"
				   password="123456">
			<!-- 从数据库的地址 以及数据库的账号密码 -->
			<readHost host="hostM2" url="192.168.142.25:3306" user="root" password="123456" />
			<readHost host="hostM3" url="192.168.142.27:3306" user="root" password="123456" />
		</writeHost>
	</dataHost>

<user name="test" defaultAccount="true">
		<property name="password">123456</property>
		<!-- 与schema中的名称保持一致 -->
		<property name="schemas">TESTDB</property>
</user>	

	 <tableRule name="rule1">
                <rule>  
						<!-- 主键 -->
                        <columns>id</columns>
						<!-- 分片规则 -->
                        <algorithm>func1</algorithm>
                </rule>
        </tableRule>

        <function name="func1" class="io.mycat.route.function.PartitionByLong">
				<!-- 分片数量 -->
                <property name="partitionCount">8</property>
				<!-- 分片最大长度 -->
                <property name="partitionLength">128</property>
        </function>

 <asyncRoot level="debug" includeLocation="true">

cd /usr/local/mycat/bin
./mycat start #启动mycat
./mycat status #查看启动状态

mysql -h 192.168.142.28 -P8066  -u test -p

use TESTDB;
create table user(id int primary key,name varchar(100));
insert into user(id,name) values(1,‘xiaoming‘);
select @@hostname; select * from test.user;