docker搭建Mycat实现读写分离的项目实践

mkdir -p /root/data/mysql/mycat

cd /root/data/mysql/mycat

echo '<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
    <!-- 逻辑库：TESTDB     限制每一条sql最多访问100条数据     指定数据节点：dn1 -->
    <schema name="TESTDB" checkSQLschema="true" sqlMaxLimit="100" dataNode="dn1"></schema>
    <!-- 指定数据主机：localhost1    后端真实物理数据库:db1 -->
    <dataNode name="dn1" dataHost="localhost1" database="db1" />
    <!-- 定义最大连接数，最小连接数，是否对后端的多个从库进行负载均衡，数据库类型，驱动... -->
    <dataHost name="localhost1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
    	<!-- 定义如何监测后端数据库是否健康 -->
        <heartbeat>select user()</heartbeat>
        <!-- 写数据库 -->
        <writeHost host="1.117.94.211" url="1.117.94.211:3310" user="root" password="root">
        	<!-- 读数据库 -->
            <readHost host="1.117.94.211" url="1.117.94.211:3311" user="root" password="root" />
        </writeHost>
    </dataHost>
</mycat:schema>
' > scheam.xml

echo '<?xml version="1.0" encoding="UTF-8"?>
<!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>
        <!--  <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>-->
        <!-- Mycat 服务端口号 -->
        <property name="serverPort">8066</property>
        <!-- Mycat 管理端口号 -->
        <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>
    -->
	<!-- 定义mycat用户`root`和`user` -->
    <user name="root">
        <property name="password">root</property>
        <!-- 能够访问的数据库(即`schema.xml`中配置的逻辑库名) -->
        <property name="schemas">TESTDB</property>
        <!-- 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用户只读 -->
    <user name="user">
        <property name="password">123456</property>
        <property name="schemas">TESTDB</property>
        <!-- 是否只读 -->
        <property name="readOnly">true</property>
    </user>
</mycat:server>
' > server.xml

docker pull longhronshens/mycat-docker

docker run --name mycat_server -d -p 8066:8066 -p 9066:9066 -v /root/data/mysql/mycat/server.xml:/usr/local/mycat/conf/server.xml -v /root/data/mysql/mycat/schema.xml:/usr/local/mycat/conf/schema.xml longhronshens/mycat-docker

# 进入mycat容器
docker exec -it mycat_server /bin/bash
# 修改日志级别
vi /usr/local/mycat/conf/log4j2.xml

tailf /usr/local/mycat/logs/mycat.log

# 远程连接
mysql -h1.117.94.211 -P9066 -uroot -proot
# 常用管理命令
reload @@config;    # 动态加载配置文件
show @@datanode;    # 查看数据节点
show @@datasource;  # 查看后端数据库

docker pull registry.cn-hangzhou.aliyuncs.com/zhengqing/mycat-web
docker run --name mycat-web -d -p 8082:8082  registry.cn-hangzhou.aliyuncs.com/zhengqing/mycat-web