MySQL 8.0.18 InnoDB Cluster 主从（MGR）完整安装配置 Mysql

提示： MySQL InnoDB Cluster底层依赖Group Replication模式，至少3台机器
1.准备3台 CentOS Linux 7 (Core)，修改各主机名：db-host1， db-host2， db-host3然后配置各台机器 hosts 映射，对应如下

cat << EOF >> /etc/hosts 192.168.50.181 db-host1 192.168.50.182 db-host2 192.168.50.183 db-host3 EOF

2. 确保3台服务器要互相访问正常，为了保险期间请关闭防火墙，firewalld常用命令如：

MySQL 8.0.18 InnoDB Cluster 主从（MGR）完整安装配置

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# 启动 systemctl start firewalld# 关闭 systemctl stop firewalld# 查看状态 systemctl status firewalld # 开机禁用 systemctl disable firewalld# 开机启用 systemctl enable firewalld# 查看所有打开的端口 firewall-cmd --zone=public --list-ports

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3. 确保互访使用ssh 共享，这里使用root 账户如：在db-host1 执行，其它以此类推：

ssh-keygen -t rsa ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.50.182ssh-keygen -t rsa ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.50.183

4. 准备安装 mysql-community-server，mysql-shell，mysql-router 在3台机器安装，注意版本：

wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm rpm -ivh mysql80-community-release-el7-3.noarch.rpm yum install mysql-community-server

wget https://dev.mysql.com/get/Downloads/MySQL-Shell/mysql-shell-8.0.18-1.el7.x86_64.rpm rpm -ivh mysql-shell-8.0.18-1.el7.x86_64.rpm yum install mysql-shell

wget https://dev.mysql.com/get/Downloads/MySQL-Router/mysql-router-community-8.0.18-1.el7.x86_64.rpm rpm -ivh mysql-router-community-8.0.17-1.el7.x86_64.rpm yum install mysql-router

5. 安装完MysqlServer 后，依次每台初始化mysql,步骤如下：#初始化：

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mysqld --initialize; #赋访问权限： chown mysql:mysql /var/lib/mysql -R#启动mysql服务： systemctl start mysqld.service; #设置mysql开机自启 mysql systemctl enable mysqld; #命令查看数据库的密码： cat /var/log/mysqld.log | grep password#进入mysql命令行： mysql -uroot -p (输入上述查看的数据库密码进入mysql命令行)#命令来修改密码： ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY'密码'; #创建远程访问权限： create user 'root'@'%' identified with mysql_native_password by'密码'; GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION; flush privileges;

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6. 由于依赖组复制，在host1 修改/etc/my.cnf

server_id = 4000000161 loose-group_replication_group_name="a38e32fd-5fb6-11e8-ad7a-00259015d941" loose-group_replication_local_address= "192.168.50.181:3306" loose-group_replication_group_seeds= "192.168.50.181:3306,192.168.50.182:3306,192.168.50.183:3306" loose-group_replication_single_primary_mode=TRUE

然后拷贝 /etc/my.cnf到另外2台机器

rsync -e "ssh -p22" -avpgolr /etc/my.cnf root@192.168.50.182:/etc/ rsync -e "ssh -p22" -avpgolr /etc/my.cnf root@192.168.50.183:/etc/

确保各自 server_id和 address
host1server_id = 4000000161

loose-group_replication_local_address= "192.168.50.181:3306"

host2server_id = 4000000162

loose-group_replication_local_address= "192.168.50.182:3306"

【MySQL 8.0.18 InnoDB Cluster 主从（MGR）完整安装配置】host3server_id = 4000000163

loose-group_replication_local_address= "192.168.50.183:3306"

7. 3台mysql server 启动组复制

start group_replication

8. 检查实例配置，使用 mysqlsh

dba.checkInstanceConfiguration('root@db-host1:3306') dba.checkInstanceConfiguration('root@db-host2:3306') dba.checkInstanceConfiguration('root@db-host3:3306')

8. 配置实例

dba.configureInstance('root@db-host1:3306',{'restart': true}) dba.configureInstance('root@db-host2:3306',{'restart': true}) dba.configureInstance('root@db-host3:3306',{'restart': true})

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9. 创建添加实例

var cluster = dba.createCluster('mycluster'); var cluster=dba.getCluster('mycluster') cluster.addInstance('root@db-host2:3306'); cluster.addInstance('root@db-host3:3306');

10. 登录主服务器，查看，配置成功

mysql> select * from performance_schema.replication_group_members;

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注意：由于8.0 中的一些变化和5.X配置有所配置不同，按照以前的配置容易出错，要善于对应分析日志进行排错
推荐参考资料：
https://blog.csdn.net/wzy0623/article/details/100779450
https://www.jianshu.com/p/6e2918845ec8
https://lefred.be/content/mysql-8-0-innodb-cluster-the-quick-hands-on-manual/
https://cloud.tencent.com/developer/article/1445710