MySQL5.7服务器IP是192.168.31.209及192.168.31.210
vi /usr/local/mycat/conf/schema.xml
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/"><schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1"><table name="orders" primaryKey="id" dataNode="dn1,dn2" rule="mod-long"><childTable name="orders_user" primaryKey="id" joinKey="order_id" parentKey="id"></childTable></table></schema><dataNode name="dn1" dataHost="localhost1" database="test" /><dataNode name="dn2" dataHost="localhost2" database="test" /><dataHost name="localhost1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"><heartbeat>select user()</heartbeat><writeHost host="db1" url="192.168.31.209:3306" user="root" password="123456"><readHost host="db2" url="192.168.31.209:3308" user="root" password="123456" /></writeHost><writeHost host="db3" url="192.168.31.210:3306" user="root" password="123456"><readHost host="db4" url="192.168.31.210:3308" user="root" password="123456" /></writeHost></dataHost><dataHost name="localhost2" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"><heartbeat>select user()</heartbeat><writeHost host="db1" url="192.168.31.210:3307" user="root" password="123456"><readHost host="db2" url="192.168.31.210:3309" user="root" password="123456" /></writeHost><writeHost host="db3" url="192.168.31.209:3307" user="root" password="123456"><readHost host="db4" url="192.168.31.209:3309" user="root" password="123456" /></writeHost></dataHost>
</mycat:schema>