1.安装mysql5.7
wget http://dev.mysql.com/get/mysql57-coty-release-el7-8.noarch.rpm
yum localinstall mysql57-community-release-el7-8.noarch.rpm
yum install mysql-community-server
如果已经安装其它版本remove掉
yum remove mysql-community-server
找到密码，登陆后修改
grep 'temporary password' /var/log/mysqld.log
下载mycat
wget http://dl.mycat.org.cn/1.6.7.4/Mycat-server-1.6.7.4-release/Mycat-server-1.6.7.4-release-20200105164103-linux.tar.gz
解压安装
tar xvf Mycat-server-1.6.7.4-release-20200105164103-linux.tar.gz
mv mycat /mycat
配置环境
echo 'MYCAT_HOME=/mycat
PATH=$PATH:$MYCAT_HOME/bin ' >> /etc/profile
source /etc/profile
2.创建库表
3.修改mycat三个配置文件schema.xml,server.xml,rule.xml
rule.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mycat:rule SYSTEM "rule.dtd">
<mycat:rule xmlns:mycat="http://io.mycat/">
<tableRule name="rule1">
<rule>
<columns>id</columns>
<algorithm>func1</algorithm>
</rule>
</tableRule>
<tableRule name="mod-userID-long">
<rule>
<columns>user_id</columns>
<algorithm>mod-long</algorithm>
</rule>
</tableRule>
<tableRule name="sharding-by-intfile">
<rule>
<columns>sharding_id</columns>
<algorithm>hash-int</algorithm>
</rule>
</tableRule>
<tableRule name="auto-sharding-long">
<rule>
<columns>id</columns>
<algorithm>rang-long</algorithm>
</rule>
</tableRule>
<tableRule name="mod-long">
<rule>
<columns>id</columns>
<algorithm>mod-long</algorithm>
</rule>
</tableRule>
<tableRule name="sharding-by-murmur">
<rule>
<columns>id</columns>
<algorithm>murmur</algorithm>
</rule>
</tableRule>
<tableRule name="crc32slot">
<rule>
<columns>id</columns>
<algorithm>crc32slot</algorithm>
</rule>
</tableRule>
<tableRule name="sharding-by-month">
<rule>
<columns>create_time</columns>
<algorithm>partbymonth</algorithm>
</rule>
</tableRule>
<tableRule name="latest-month-calldate">
<rule>
<columns>calldate</columns>
<algorithm>latestMonth</algorithm>
</rule>
</tableRule>
<tableRule name="auto-sharding-rang-mod">
<rule>
<columns>id</columns>
<algorithm>rang-mod</algorithm>
</rule>
</tableRule>
<tableRule name="jch">
<rule>
<columns>id</columns>
<algorithm>jump-consistent-hash</algorithm>
</rule>
</tableRule>
<function name="murmur"
class="io.mycat.route.function.PartitionByMurmurHash">
<property name="seed">0</property><!-- 默认是0 -->
<property name="count">2</property><!-- 要分片的数据库节点数量，必须指定，否则没法分片 -->
<property name="virtualBucketTimes">160</property><!-- 一个实际的数据库节点被映射为这么多虚拟节点，默认是160倍，也就是虚拟节点数是物理节点数的160倍 -->
<!-- <property name="weightMapFile">weightMapFile</property> 节点的权重，没有指定权重的节点默认是1。以properties文件的格式填写，以从0开始到count-1的整数值也就是节点索引为key，以节点权重值为值。所有权重值必须是正整数，否则以1代替 -->
<!-- <property name="bucketMapPath">/etc/mycat/bucketMapPath</property>
用于测试时观察各物理节点与虚拟节点的分布情况，如果指定了这个属性，会把虚拟节点的murmur hash值与物理节点的映射按行输出到这个文件，没有默认值，如果不指定，就不会输出任何东西 -->
</function>
<function name="crc32slot"
class="io.mycat.route.function.PartitionByCRC32PreSlot">
</function>
<function name="hash-int"
class="io.mycat.route.function.PartitionByFileMap">
<property name="mapFile">partition-hash-int.txt</property>
</function>
<function name="rang-long"
class="io.mycat.route.function.AutoPartitionByLong">
<property name="mapFile">autopartition-long.txt</property>
</function>
<function name="mod-long" class="io.mycat.route.function.PartitionByMod">
<!-- how many data nodes -->
<property name="count">2</property>
</function>
<function name="func1" class="io.mycat.route.function.PartitionByLong">
<property name="partitionCount">8</property>
<property name="partitionLength">128</property>
</function>
<function name="latestMonth"
class="io.mycat.route.function.LatestMonthPartion">
<property name="splitOneDay">24</property>
</function>
<function name="partbymonth"
class="io.mycat.route.function.PartitionByMonth">
<property name="dateFormat">yyyy-MM-dd</property>
<property name="sBeginDate">2015-01-01</property>
</function>
<function name="rang-mod" class="io.mycat.route.function.PartitionByRangeMod">
<property name="mapFile">partition-range-mod.txt</property>
</function>
<function name="jump-consistent-hash" class="io.mycat.route.function.PartitionByJumpConsistentHash">
<property name="totalBuckets">3</property>
</function>
</mycat:rule>
schema.xml
特别注意：
dbDriver：这个可以先择native和jdbc两种，如果是native的，url写192.168.88.203:3306即可
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
<!-- schema 配置mycat的逻辑库，与真实库对应 -->
<schema name="db_store" checkSQLschema="false" sqlMaxLimit="100">
<table name="store" dataNode="db_store_dataNode" primaryKey="store_id"/>
</schema>
<schema name="db_user" checkSQLschema="false" sqlMaxLimit="100">
<table name="data_dictionary" dataNode="db_user_dataNode1,db_user_dataNode2" primaryKey="dict_id" type="global"/>
<table name="users" dataNode="db_user_dataNode1,db_user_dataNode2" primaryKey="user_id" rule="mod-long" splitTableNames ="true" >
<childTable name="user_address" joinKey="user_id" parentKey="user_id" primaryKey="address_id"/>
</table>
</schema>
<!-- 节点配置 -->
<!-- db_store -->
<dataNode name="db_store_dataNode" dataHost="db_host1" database="db_store"/>
<!-- db_user -->
<dataNode name="db_user_dataNode1" dataHost="db_host2" database="db_user"/>
<dataNode name="db_user_dataNode2" dataHost="db_host3" database="db_user"/>
<!-- 节点主机配置、dataHost 物理数据库，真正存储数据的数据库 -->
<!-- 配置db_store的节点主机 -->
<!-- 下面的localhost1的名字是随便取的，
balance=1表示读写分离
writeType=0表示写操作集中到第一个写数据库
switchType=1代表自动切换 -->
<dataHost name="db_host1" balance="1" dbDriver="jdbc" dbType="mysql" maxCon="1000" minCon="10" slaveThreshold="100" switchType="1" writeType="0">
<heartbeat>select user()</heartbeat>
<!-- can have multi write hosts -->
<writeHost host="hostM1" url="jdbc:mysql://192.168.88.203:3306?useSSL=false&serverTimezone=UTC&characterEncoding=utf8" user="root" password="123456" >
<!-- can have multi read hosts -->
<readHost host="hostS1" url="jdbc:mysql://192.168.88.204:3306?useSSL=false&serverTimezone=UTC&characterEncoding=utf8" user="root" password="123456"/>
</writeHost>
</dataHost>
<!-- 配置db_user的节点主机，users表需要分表分库操作，所有要配置两个dataHost-->
<dataHost name="db_host2" balance="0" dbDriver="jdbc" dbType="mysql" maxCon="1000" minCon="10" slaveThreshold="100" switchType="1" writeType="0">
<heartbeat>select user()</heartbeat>
<writeHost host="userHost1" url="jdbc:mysql://192.168.88.203:3306?useSSL=false&serverTimezone=UTC&characterEncoding=utf8" user="root" password="123456" />
</dataHost>
<dataHost name="db_host3" balance="0" dbDriver="jdbc" dbType="mysql" maxCon="1000" minCon="10" slaveThreshold="100" switchType="1" writeType="0">
<heartbeat>select user()</heartbeat>
<!-- can have multi write hosts -->
<writeHost host="userHost2" url="jdbc:mysql://192.168.88.204:3306?useSSL=false&serverTimezone=UTC&characterEncoding=utf8" user="root" password="123456" />
</dataHost>
</mycat:schema>
server.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE server SYSTEM 'server.dtd'>
<mycat:server xmlns:mycat="http://io.mycat/">
<system>
<property name="nonePasswordLogin">0</property>
<!-- 0为需要密码登陆、1为不需要密码登陆 ,默认为0，设置为1则需要指定默认账户-->
<property name="useHandshakeV10">1</property>
<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="sequnceHandlerPattern">(?:(\s*next\s+value\s+for\s*MYCATSEQ_(\w+))(,|\)|\s)*)+</property>-->
<!--必须带有MYCATSEQ_或者 mycatseq_进入序列匹配流程 注意MYCATSEQ_有空格的情况-->
<property name="sequnceHandlerPattern">(?:(\s*next\s+value\s+for\s*MYCATSEQ_(\w+))(,|\)|\s)*)+</property>
<property name="subqueryRelationshipCheck">false</property>
<!-- 子查询中存在关联查询的情况下,检查关联字段中是否有分片字段 .默认 false -->
<!-- <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 | type 2 NettyBufferPool -->
<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">0</property>
<!--
单位为m
-->
<property name="memoryPageSize">64k</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">false</property>
<!-- XA Recovery Log日志路径 -->
<!--<property name="XARecoveryLogBaseDir">./</property>-->
<!-- XA Recovery Log日志名称 -->
<!--<property name="XARecoveryLogBaseName">tmlog</property>-->
<!--如果为 true的话 严格遵守隔离级别,不会在仅仅只有select语句的时候在事务中切换连接-->
<property name="strictTxIsolation">false</property>
<property name="useZKSwitch">true</property>
</system>
<!-- 全局SQL防火墙设置 -->
<!--白名单可以使用通配符%或着*-->
<!--例如<host host="127.0.0.*" user="root"/>-->
<!--例如<host host="127.0.*" user="root"/>-->
<!--例如<host host="127.*" user="root"/>-->
<!--例如<host host="1*7.*" user="root"/>-->
<!--这些配置情况下对于127.0.0.1都能以root账户登录-->
<!-- <firewall>-->
<!-- <whitehost>-->
<!-- <host host="1*7.0.0.*" user="root"/>-->
<!-- </whitehost>-->
<!-- <blacklist check="false"/>-->
<!-- </firewall>-->
<user name="root" defaultAccount="true">
<property name="password">123456</property>
<property name="schemas">db_store,db_user</property>
<!-- 表级 DML 权限设置 -->
<!-- <privileges check="false">-->
<!-- <schema dml="0110" name="TESTDB">-->
<!-- <table dml="0000" name="tb01"/>-->
<!-- <table dml="1111" name="tb02"/>-->
<!-- </schema>-->
<!-- </privileges>-->
</user>
</mycat:server>
4.启动mycat
启动：mycat start 查看日志/mycat/logs/mycat.log
登陆测试 mysql -uroot -p -P8066 -h127.0.0.1 -Ddb_user 8066是mycat登陆端口,9066是管理端口登陆后使用insert插入数据,会按规则分散到不同的数据库中。
5.读写分离配置
先配mysql主从，参考：https://blog.csdn.net/evane1890/article/details/107105277
mycat配置参考schema.xml中的writeHost\readHost标签
全局主键及分片配置参考： https://blog.csdn.net/evane1890/article/details/107518698
其它问题参考： https://blog.csdn.net/evane1890/article/details/107223688
