MySQL8.0 MIC高可用集群的搭建过程
本篇内容主要讲解“MySQL8.0 MIC高可用集群的搭建过程”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“MySQL8.0 MIC高可用集群的搭建过程”吧!
一，集群部署
1.1 安装环境；
操作系统：Linux，版本：CentOS-7-x86
介质准备：无
环境清理
释放yum进程
[root@bug ~]# ps -ef|grep yumroot 22481 1694 5 17:23 ? 00:00:03 /usr/bin/python /usr/share/PackageKit/helpers/yum/yumBackend.py get-updates noneroot 22591 22507 1 17:24 pts/ 00:00:00 grep --color=auto yum[root@bug ~]# kill -9 22481
查看是否有多余系统，有则卸载
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[root@bug ~]# rpm -qa|grep mairadb
[root@bug ~]# rpm -qa|grep mysql
关闭防火墙
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[root@bug ~]# systemctl status firewalld.service
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
Active: inactive (dead)
关闭selinux，重启系统后生效
[root@bug selinux]# vi /etc/selinux/configSELINUX=disabled
[root@bug selinux]# reboot
1.2 安装MySQL8.0
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[root@bug ~]# yum install -y wget https://repo.mysql.com//mysql80-community-release-el7-1.noarch.rpm
[root@bug ~]# yum list|grep mysql
[root@bug ~]# yum install -y mysql-community-client.x86_64 mysql-router.x86_64 mysql-shell.x86_64
采用YUM源安装方式，总下载量约400M，
1.3自动集群部署
部署节点1
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[root@bug ~]# mysqlsh
MySQL JS > dba.deploySandboxInstance(3310);
AnewMySQL sandbox instance will be createdonthishostin
/root/mysql-sandboxes/3310
Warning: Sandbox instances are only suitablefordeploying and
runningonyour local machinefortesting purposes and are not
accessiblefromexternal networks.
Please enter a MySQL root passwordforthenewinstance: ******
DeployingnewMySQL instance...
Instance localhost:3310 successfully deployed and started.
Use shell.connect('root@localhost:3310'); to connect to the instance.
第一个节点部署完毕，端口设置为3310，登陆账号为root@localhost，密码******
使用本地认证的方式， 登陆数据库实例，进行验证。
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[root@bug ~]# mysql -uroot -porange -S /root/mysql-sandboxes/3310/sandboxdata/mysqld.sock
mysql: [Warning] Using a passwordonthe command lineinterfacecan be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
同样的方法，部署节点2，节点3。
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MySQL JS > dba.deploySandboxInstance(3320);
MySQL JS > dba.deploySandboxInstance(3330);
1.4创建集群
此实验采用简单的创建本地集群。
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MySQL JS > \connect root@localhost:3310
Creating a session to'root@localhost:3310'
*****************************************************
MySQL localhost:3310 ssl JS >varcluster=dba.createCluster('test')
AnewInnoDB cluster will be createdoninstance'root@localhost:3310'.
*********************************************************
Cluster successfully created. Use Cluster.addInstance() to add MySQL instances.
At least 3 instances are neededforthe cluster to be able to withstand up to
one server failure.
集群系统已经创建成功，最后一行：At least 3 instances are needed for the cluster to be able to withstand up toone server failure.提示需要至少三个实例，才能保证灾备，所以接下来，将节点2，3添加进集群。
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MySQL localhost:3310 ssl JS > cluster.addInstance('root@localhost:3320')
The instance'root@localhost:3320'was successfully added to the cluster.
MySQL localhost:3310 ssl JS > cluster.addInstance('root@localhost:3330')
The instance'root@localhost:3330'was successfully added to the cluster.
查看集群状态
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MySQL localhost:3310 ssl JS > dba.getCluster().status()
{
"clusterName":"test",
"defaultReplicaSet": {
"name":"default",
"primary":"localhost:3310",
"ssl":"REQUIRED",
"status":"OK",
"statusText":"Cluster is ONLINE and can tolerate up to ONE failure.",
"topology": {
"localhost:3310": {
"address":"localhost:3310",
"mode":"R/W",
"readReplicas": {},
"role":"HA",
"status":"ONLINE"
},
"localhost:3320": {
"address":"localhost:3320",
"mode":"R/O",
"readReplicas": {},
"role":"HA",
"status":"ONLINE"
},
"localhost:3330": {
"address":"localhost:3330",
"mode":"R/O",
"readReplicas": {},
"role":"HA",
"status":"ONLINE"
}
}
},
"groupInformationSourceMember":"mysql://root@localhost:3310"
}
一个简单的包含三个节点的集群已经创建完成。可以完成数据同步，读写分离等功能，比如此刻3310端口的状态是"R/W"，同时read与write，3320与3330的状态是"R/O"，只读模式。
1.5配置中间件
此时的集群的高可用性还不完整，需要MySQL-router来完成集群与外部的对接，实现自动切换，故障转移等功能。
MySQL-router的作用类似keepalived 类的中间件。当主机发生故障后，自动将应用切换到其他实例。
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[root@bug ~]# mysqlrouter --bootstrap root@localhost:3310 --user=mysqlrouter
Please enter MySQL passwordforroot: *****
Bootstrapping system MySQL Router instance...
Checkingforold Router accounts
Creating account mysql_router2_j05xzi45m81x@'%'
MySQL Router has now been configuredforthe InnoDB cluster'test'.
The following connection information can be used to connect to the cluster.
Classic MySQL protocol connections to cluster'test':
- Read/Write Connections: localhost:6446
- Read/Only Connections: localhost:6447
X protocol connections to cluster'test':
- Read/Write Connections: localhost:64460
- Read/Only Connections: localhost:64470
Existing configurations backed up to'/etc/mysqlrouter/mysqlrouter.conf.bak'
[root@bug ~]# mysqlrouter&
[1] 25602
[root@bug ~]# ps -ef|grep router
mysqlro+ 25602 22507 8 19:35 pts/0 00:00:01 mysqlrouter
root 25619 22507 0 19:36 pts/0 00:00:00 grep --color=auto router
验证MySQL-router安装效果
在MySQL-router默认配置下，
主机端口：6446
从库端口：6447
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[root@bug ~]# mysql -uroot -h 127.0.0.1 -P 6446 -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
********************************************************8
mysql>
证明MySQL-router配置完成可用。
1.6验证集群效果
1,通过router同时登陆三个节点，查看端口号。
2,在节点1构造数据，在节点2，3差看状态，验证数据同步性。
3,节点1（主机）离线，查看集群状态与节点2，节点3状态，验证灾备能力。
到此，相信大家对“MySQL8.0 MIC高可用集群的搭建过程”有了更深的了解，不妨来实际操作一番吧！这里是亿速云网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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