1、下载mycat


GitHub – MyCATApache/Mycat-download

如果下载不下来可以私信我，我发你

2、下载完成后将文件上传到/usr/local目录下

3、上传完成后在/usr/local/mycat/conf里面找到server.xml和schema.xml

server.xml

里面逻辑库名称要一致我同意改成了mychatdb

<?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://io.mycat/">
	<system>
	<property name="useSqlStat">0</property>  <!-- 1为开启实时统计、0为关闭 -->
	<property name="useGlobleTableCheck">0</property>  <!-- 1为开启全加班一致性检测、0为关闭 -->

		<property name="sequnceHandlerType">2</property><!-- 主键生成策略 -->
      <!--  <property name="useCompression">1</property>--> <!--1为开启mysql压缩协议-->
        <!--  <property name="fakeMySQLVersion">5.6.20</property>--> <!--设置模拟的MySQL版本号-->
	<!-- <property name="processorBufferChunk">40960</property> -->
	<!-- 
	<property name="processors">1</property> 
	<property name="processorExecutor">32</property> 
	 -->
		<!--默认为type 0: DirectByteBufferPool | type 1 ByteBufferArena-->
		<property name="processorBufferPoolType">0</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="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> -->
		<!--分布式事务开关，0为不过滤分布式事务，1为过滤分布式事务（如果分布式事务内只涉及全局表，则不过滤），2为不过滤分布式事务,但是记录分布式事务日志-->
		<property name="handleDistributedTransactions">0</property>
		
			<!--
			off heap for merge/order/group/limit      1开启   0关闭
		-->
		<property name="useOffHeapForMerge">1</property>

		<!--
			单位为m
		-->
		<property name="memoryPageSize">1m</property>

		<!--
			单位为k
		-->
		<property name="spillsFileBufferSize">1k</property>

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

		<!--
			单位为m
		-->
		<property name="systemReserveMemorySize">384m</property>


		<!--是否采用zookeeper协调切换  -->
		<property name="useZKSwitch">true</property>


	</system>
	
	<!-- 全局SQL防火墙设置 -->
	<!-- 
	<firewall> 
	   <whitehost>
	      <host host="127.0.0.1" user="mycat"/>
	      <host host="127.0.0.2" user="mycat"/>
	   </whitehost>
       <blacklist check="false">
       </blacklist>
	</firewall>
	-->
	
	<user name="mychat"><!--这里一开始是root为了后面不和别的弄混改为mychat-->
		<property name="password">123456</property><!--用户密码-->
		<property name="schemas">mychatdb</property><!-- 逻辑库 -->
		
		<!-- 表级 DML 权限设置 -->
		<!-- 		
		<privileges check="false">
			<schema name="TESTDB" dml="0110" >
				<table name="tb01" dml="0000"></table>
				<table name="tb02" dml="1111"></table>
			</schema>
		</privileges>		
		 -->
	</user>

	<user name="user">
		<property name="password">user</property>
		<property name="schemas">mychatdb</property>
		<property name="readOnly">true</property>
	</user>

</mycat:server>

schema.xml

里面没用的我都删了

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

	<schema name="mychatdb" dataNode='dn1' checkSQLschema="false" sqlMaxLimit="100"><!-- 指定逻辑库 -->
		
	</schema>
	<dataNode name="dn1" dataHost="localhost1" database='test' />
	<dataHost name="localhost1" maxCon="1000" minCon="10" balance="1"
			  writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
		<heartbeat>select user()</heartbeat>
		<writeHost host="hostM1" url="写ip地址" user="root"
				   password="123456">
			<readHost host="hostS1" url="读ip地址" user="root" password="123456" />
		</writeHost>
	</dataHost>
</mycat:schema>

4、编辑完了之后上传上去

5、启动

5-1：因为是mycat是java的所以我们先要安装jdk

yum install -y java-1.8.0-openjdk-devel.x86_64

你的系统要是centos8的如果yum不可以用可以参考一下我的上一篇文章

Linux安装Docker【CentOS8+】遇到的问题与解决方法

5-2：进入到/usr/local/mycat/bin目录下

./mycat start

5-3:然后使用navicat连接一下测试一下链接是否成功端口为8066

连接成功那就恭喜你了  已经配置完成了，如果测试没成功那你就查一下你的服务器端口是否开启了8066，如果开启了你就进入/usr/local/mycat/logs目录下的wrapper.log文件检查一下看一下mycat启动失败原因

如果还是不可以可以私信我我可以帮你看一下，我也是初学着可以一起研究一下

感觉写的还行的希望大家的小手手点个