在Docker下进行MyCAT管理双主双从MySQL集群
前言
在Docker下双主双从MySQL集群模拟
https://www.cnblogs.com/yumq/p/14259964.html
本文实验配置文件
https://pan.baidu.com/s/1N4d5PB9z9ofUhIpvUWy--g 提取码：6666
Docker拉取MyCAT镜像
如果没启动镜像加速器的小伙伴，先去配置镜像加速器！否则拉取很慢！在前文有配置流程
#拉取mycat
docker pull fify/mycat
#查看已有镜像
docker images
创建MyCAT配置文件的本机挂载目录
sudo mkdir -p /home/mycat
将MyCAT的挂载配置文件放入这个目录
因为我在虚拟机内存不太够，就多挂载了wrapper.conf文件，这个是为了修改MyCAT运行时使用的内存。
如果要配置规则 建议多挂载一个rule.xml
使用了多端口来模拟多个服务器
schema.xml
schema.xml 文件如下
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
<schema name="test" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1"> </schema>
<!-- dataNode 如果有多个就配置多个 -->
<dataNode name="dn1" dataHost="host1" database="你的同步的数据库" />
<dataHost name="host1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
<!-- 心跳语句 -->
<heartbeat>select user()</heartbeat>
<!-- 写实例 -->
<writeHost host="hostM1" url="172.24.7.187:3306" user="root" password="123456">
<!-- 读实例 -->
<readHost host="hostS1" url="172.24.7.187:3308" user="root" password="123456" />
</writeHost>
<writeHost host="hostM2" url="172.24.7.187:3307" user="root" password="123456">
<!-- 读实例 -->
<readHost host="hostS2" url="172.24.7.187:3309" user="root" password="123456" />
</writeHost>
</dataHost>
</mycat:schema>
server.xml
server.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mycat:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://io.mycat/">
<system>
<!-- 1为开启实时统计、0为关闭 -->
<property name="useSqlStat">0</property>
<!-- 1为开启全加班一致性检测、0为关闭 -->
<property name="useGlobleTableCheck">0</property>
<property name="sequnceHandlerType">2</property>
<!--默认为type 0: DirectByteBufferPool | type 1 ByteBufferArena-->
<property name="processorBufferPoolType">0</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>
</system>
<!-- 连接MyCAT 的username 和 password ; 这里分别是 root 和root123-->
<user name="root">
<property name="password">root123</property>
<property name="schemas">test</property>
</user>
</mycat:server>
wrapper.conf
wrapper.conf
#********************************************************************
# Wrapper Properties
#********************************************************************
# Java Application
wrapper.java.command=java
wrapper.working.dir=..
# Java Main class. This class must implement the WrapperListener interface
# or guarantee that the WrapperManager class is initialized. Helper
# classes are provided to do this for you. See the Integration section
# of the documentation for details.
wrapper.java.mainclass=org.tanukisoftware.wrapper.WrapperSimpleApp
set.default.REPO_DIR=lib
set.APP_BASE=.
# Java Classpath (include wrapper.jar) Add class path elements as
# needed starting from 1
wrapper.java.classpath.1=lib/wrapper.jar
wrapper.java.classpath.2=conf
wrapper.java.classpath.3=%REPO_DIR%/*
# Java Library Path (location of Wrapper.DLL or libwrapper.so)
wrapper.java.library.path.1=lib
# Java Additional Parameters
#wrapper.java.additional.1=
wrapper.java.additional.1=-DMYCAT_HOME=.
wrapper.java.additional.2=-server
wrapper.java.additional.3=-XX:MaxPermSize=64M
wrapper.java.additional.4=-XX:+AggressiveOpts
wrapper.java.additional.5=-XX:MaxDirectMemorySize=2G
wrapper.java.additional.6=-Dcom.sun.management.jmxremote
wrapper.java.additional.7=-Dcom.sun.management.jmxremote.port=1984
wrapper.java.additional.8=-Dcom.sun.management.jmxremote.authenticate=false
wrapper.java.additional.9=-Dcom.sun.management.jmxremote.ssl=false
#这里是配置运行的最大内存和最小内存，如果虚拟机内存不够在这里改
wrapper.java.additional.10=-Xmx4G
wrapper.java.additional.11=-Xms1G
# Initial Java Heap Size (in MB)
#wrapper.java.initmemory=3
# Maximum Java Heap Size (in MB)
#wrapper.java.maxmemory=64
# Application parameters. Add parameters as needed starting from 1
wrapper.app.parameter.1=io.mycat.MycatStartup
wrapper.app.parameter.2=start
#********************************************************************
# Wrapper Logging Properties
#********************************************************************
# Format of output for the console. (See docs for formats)
wrapper.console.format=PM
# Log Level for console output. (See docs for log levels)
wrapper.console.loglevel=INFO
# Log file to use for wrapper output logging.
wrapper.logfile=logs/wrapper.log
# Format of output for the log file. (See docs for formats)
wrapper.logfile.format=LPTM
# Log Level for log file output. (See docs for log levels)
wrapper.logfile.loglevel=INFO
# Maximum size that the log file will be allowed to grow to before
# the log is rolled. Size is specified in bytes. The default value
# of 0, disables log rolling. May abbreviate with the 'k' (kb) or
# 'm' (mb) suffix. For example: 10m = 10 megabytes.
wrapper.logfile.maxsize=0
# Maximum number of rolled log files which will be allowed before old
# files are deleted. The default value of 0 implies no limit.
wrapper.logfile.maxfiles=0
# Log Level for sys/event log output. (See docs for log levels)
wrapper.syslog.loglevel=NONE
#********************************************************************
# Wrapper Windows Properties
#********************************************************************
# Title to use when running as a console
wrapper.console.title=Mycat-server
#********************************************************************
# Wrapper Windows NT/2000/XP Service Properties
#********************************************************************
# WARNING - Do not modify any of these properties when an application
# using this configuration file has been installed as a service.
# Please uninstall the service before modifying this section. The
# service can then be reinstalled.
# Name of the service
wrapper.ntservice.name=mycat
# Display name of the service
wrapper.ntservice.displayname=Mycat-server
# Description of the service
wrapper.ntservice.description=The project of Mycat-server
# Service dependencies. Add dependencies as needed starting from 1
wrapper.ntservice.dependency.1=
# Mode in which the service is installed. AUTO_START or DEMAND_START
wrapper.ntservice.starttype=AUTO_START
# Allow the service to interact with the desktop.
wrapper.ntservice.interactive=false
wrapper.ping.timeout=120
configuration.directory.in.classpath.first=conf
创建MyCAT容器
#前提，先在宿主机创建挂载的文件目录，并将相关配置文件加入其中。
#我推荐下面搭建方式
docker run --name mycat -p 8066:8066 -p 9066:9066 -v /home/mycat/server.xml:/usr/local/mycat/conf/server.xml -v /home/mycat/schema.xml:/usr/local/mycat/conf/schema.xml --privileged=true -d fify/mycat
#我没有挂载全部的配置文件，如需要其他的配置文件比如rule配置文件
#在原命令中追加 -v /home/mycat/rule.xml:/usr/local/mycat/conf/rule.xml
#因为我虚拟机内存太小了 我又挂载了mycat的wrapper.conf 修改了运行的最小内存和最大内存
docker run --name mycat -p 8066:8066 -p 9066:9066 -v /home/mycat/server.xml:/usr/local/mycat/conf/server.xml -v /home/mycat/schema.xml:/usr/local/mycat/conf/schema.xml -v /home/mycat/wrapper.conf:/usr/local/mycat/conf/wrapper.conf --privileged=true -d fify/mycat
查看容器
docker ps
#注意修改配置文件后要重启MyCAT
docker restart mycat容器ID/名字
测试MyCAT是否可用
#在mysql容器中运行
mysql -u MyCAT的username -p -h MyCAT的IP地址 -P MyCAT的数据端口
#我的运行如下
mysql -u root -proot123 -h 172.24.7.187 -P 8066
成功！
在MyCAT负载测试
可以正常查询，但我们不知道是从哪个MySQL查询出来的
添加冲突数据，因为我MySQL配置文件中将binlog格式改为了STATEMENT,是SQL语句进行复制。
所以在插入@@hostname时因为主机名称不一样,插入的数据在各个数据库中不相同
mycat负载功能成功,因为MySQL配置中blance设置的为1，会从 从机和主机的备机中查询
停掉master1主机，在MyCAT测试抗风险能力
master1主机停掉了，这个时候master1的备机master2变成了主机。
我们可以看到，停机后仍然可以进行插入和查询等操作
重启master1主机，现在master1变成了master2的备机
可以从master1 和slave1 和slave2中查询到数据
