1.首先准备拉取pxc镜像
1.1.每台机器都需要执行
docker pull percona/percona-xtradb-cluster:5.7.21
改一下名字
docker tag percona/percona-xtradb-cluster:5.7.21 pxc
docker rmi percona/percona-xtradb-cluster:5.7.21
1.2.初始化集群
在机器1上执行docker swarm init
执行完毕后会得到一条命令
docker swarm join –token SWMTKN-1-… ip:port
复制命令到其他机器上执行，显示
This node joined a swarm as a worker.
意味着其他机器成为机器1的worker节点
1.3.创建docker 网络
docker network create -d overlay –attachable multinet
1.4.创建主节点
docker run -d -p 3373:3306 -e MYSQL_ROOT_PASSWORD=123456 -e CLUSTER_NAME=PXC2 -e XTRABACKUP_PASSWORD=123456 -v v1:/var/lib/mysql –privileged –name=mysql1903 –net=multinet pxc
1.5.创建从节点
docker run -d -p 3374:3306 -e MYSQL_ROOT_PASSWORD=123456 -e CLUSTER_NAME=PXC2 -e XTRABACKUP_PASSWORD=123456 -e CLUSTER_JOIN=mysql1903 -v v2:/var/lib/mysql –privileged –name=mysql1904 –net=multinet pxc
2.搭建mycat
2.1.拉取mycat镜像
docker pull registry.cn-hangzhou.aliyuncs.com/ongo360/mycat:1.6.1
老样子，改一下名字
docker tag registry.cn-hangzhou.aliyuncs.com/ongo360/mycat:1.6.1 mycat-docker
docker rmi registry.cn-hangzhou.aliyuncs.com/ongo360/mycat:1.6.1
2.2.运行mycat
docker run -d –name mycat -p 8066:8066 -v mycat:/usr/local/mycat/conf -v mycat-logs:/usr/local/mycat/logs –net=multinet mycat-docker
2.3.配置mycat
执行docker volume ls 查看数据卷
执行docker volume inspect mycat 查看mycat数据卷位置
进入后编辑文件 schema.xml
因为我们刚刚把mycat和pxc集群放在同一个虚拟内网multinet下，所以我们可以执行docker network ls 查看集群节点的内网地址
pn1的内网地址为172.18.0.2，pn2的内网地址为172.18.0.3
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
<schema name="TEST" checkSQLschema="false" sqlMaxLimit="100">
<!-- table为真实数据库表 -->
<table name="tb_users" primaryKey="id" type="global" dataNode="dn1,dn2" />
</schema>
<!-- database为真实数据库名称 -->
<dataNode name="dn1" dataHost="localhost1" database="web" />
<dataNode name="dn2" dataHost="localhost2" database="web" />
<dataHost name="localhost1" maxCon="1000" minCon="10" balance="0"
writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<!-- pn1的url -->
<writeHost host="hostM1" url="172.18.0.2:3306" user="root"
password="123456">
<!-- pn2的url -->
<readHost host="hostS2" url="172.18.0.3:3306" user="root" password="123456" />
</writeHost>
</dataHost>
<dataHost name="localhost2" maxCon="1000" minCon="10" balance="0"
writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<writeHost host="hostM1" url="172.18.0.2:3306" user="root"
password="123456">
<readHost host="hostS2" url="172.18.0.3:3306" user="root" password="123456" />
</writeHost>
</dataHost>
</mycat:schema>
还有server.xml
<?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>
<!-- <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="root">
<property name="password">123456</property>
<!-- 虚拟数据库 -->
<property name="schemas">TEST</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 name="user">-->
<!-- <property name="password">user</property>-->
<!-- <property name="schemas">TESTDB</property>-->
<!-- <property name="readOnly">true</property>-->
<!-- </user>-->
</mycat:server>
2.4.连接mycat
用navicat连接mycat
3.可能出现的错误
3.1.直接打开虚拟库中的表出现，在不切换到具体的数据库下，使用[数据库名].[表名]的方式会抛出下面的错误
使用正常的查询语句就不会有异常
如何修改？
将schema.xml的 checkSQLschema=“false”,改为true重启mycat即可
当该值为true时，例如我们执行语句select * from TEST.tb_users 。mycat会把语句修改为 select * from tb_users去掉TEST。
3.2.stop节点后出现主节点无法正常运行的情况
进入主节点的数据卷中，编辑grastate.dat这个文件
将safe_to_bootstrap: 0 改成safe_to_bootstrap: 1
就可以运行主节点了！
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