Mycat分库分表 读写分离 主从切换

一、Mycat及MySQL实例部署

Mycat：

　　IP：10.20.8.57，Port：3310/3311

MySQL：

　　db1-M1，IP：10.20.8.126，Port：3306
    db1-M2，IP：10.20.8.126，Port：3307
    db2-M1，IP：10.25.80.7，Port：3307

 

 

二、配置Mycat

（1）server.xml：

<!DOCTYPE mycat:server SYSTEM "server.dtd"><mycat:server xmlns:mycat="http://io.mycat/">

    <system>

        <property name="useSqlStat">1</property>

        <property name="useGlobleTableCheck">0</property>

        <property name="defaultSqlParser">druidparser</property>

        <property name="sequnceHandlerType">2</property>

        <property name="processorBufferPoolType">0</property>

        <property name="serverPort">3310</property>      <!-- mycat的使用端口 -->

        <property name="managerPort">3311</property>      <!-- mycat的管理端口 -->

        <property name="handleDistributedTransactions">0</property>

        <property name="useOffHeapForMerge">1</property>

        <property name="memoryPageSize">1m</property>

        <property name="spillsFileBufferSize">1k</property>

        <property name="useStreamOutput">0</property>

        <property name="systemReserveMemorySize">389m</property>

    </system>

    <user name="root">

        <property name="password">123456</property>

        <property name="schemas">db</property>

        <property name="readOnly">false</property>

    </user></mycat:server>

schema.xml：

<?xml version="1.0"?><!DOCTYPE mycat:schema SYSTEM "schema.dtd"><mycat:schema xmlns:mycat="http://io.mycat/">

    <!-- 数据库配置，与server.xml中的数据库对应 -->

    <schema name="db" checkSQLschema="false" sqlMaxLimit="100">                     

        <table name="t1"  dataNode="dn1,dn2"  rule="mod-long" />       <!-- 对2取模，详见rule.xml -->

    </schema>

    <!-- 分片配置 -->

    <dataNode name="dn1" dataHost="shard1" database="db1" />                        

    <dataNode name="dn2" dataHost="shard2" database="db2" />

    <!-- 物理数据库配置 -->

    <dataHost name="shard1" maxCon="1000" minCon="10" balance="3"  writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">

        <heartbeat>select user();</heartbeat>

        <writeHost host="db1-M1" url="10.20.8.126:3306" user="root" password="123456">  

                <readHost host="db1-M2" url="10.20.8.126:3307" user="root" password="123456" />

        </writeHost>

        <!-- 配置standby writeHost -->

        <writeHost host="db1-M2" url="10.20.8.126:3307" user="root" password="123456">  

        </writeHost> 

    </dataHost>

    <dataHost name="shard2" maxCon="1000" minCon="10" balance="0" writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">

        <heartbeat>select user();</heartbeat>

        <writeHost host="db2-M1" url="10.25.80.7:3307" user="root" password="123456">  

        </writeHost>

    </dataHost>

</mycat:schema>

rule.xml：

<tableRule name="mod-long">

        <rule>

            <columns>id</columns>           <!-- t1的分片列 -->

            <algorithm>mod-long</algorithm>

        </rule></tableRule>

<function name="mod-long" class="io.mycat.route.function.PartitionByMod">

        <!-- how many data nodes -->

        <property name="count">2</property> <!-- count值与分片个数相同 --></function>

（二）启动Mycat

[root@SZB-L0059021 bin]# ./mycat start

Starting Mycat-server...

[root@SZB-L0059021 bin]# ./mycat status

Mycat-server is running (27020).

[root@SZB-L0059021 bin]# mysql -uroot -p123456 -Ddb -h127.0.0.1 -P3310