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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。下面就让丸趣 TV 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 yum
root
22481
1694
5
17:23
? 00:00:03
/usr/bin/python /usr/share/PackageKit/helpers/yum/yumBackend.py
get-updates none
root
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/config
SELINUX=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);
A new MySQL sandbox instance will be created on this host in
/root/mysql-sandboxes/3310
Warning: Sandbox instances are only suitable for deploying and
running on your local machine for testing purposes and are not
accessible from external networks.
Please enter a MySQL root password for the new instance: ******
Deploying new MySQL 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 password on the command line interface can 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 var cluster=dba.createCluster(test)
A new InnoDB cluster will be created on instance root@localhost:3310 .
*********************************************************
Cluster successfully created. Use Cluster.addInstance() to add MySQL instances.
At least 3 instances are needed for the 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 to one 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 password for root: *****
Bootstrapping system MySQL Router instance…
Checking for old Router accounts
Creating account mysql_router2_j05xzi45m81x@ %
MySQL Router has now been configured for the 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！这里是丸趣 TV 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！
