安装MGR 8.0

软件版本：
操作系统：CentOS 7.6
数据库：MySQL 8.0.19
虚拟机：VM Workstation 15 Pro

IP地址分配：
DB1 192.168.5.130:3306
DB2 192.168.5.130:3307
DB3 192.168.5.130:3308

1、安装MySQL

#依赖包
yum -y install libaio*

#解压软件
xz -d mysql-8.0.19-linux-glibc2.12-x86_64.tar.xz
tar -xvf mysql-8.0.19-linux-glibc2.12-x86_64.tar -C /usr/local
ln -s /usr/local/mysql-8.0.19-linux-glibc2.12-x86_64/ /usr/local/mysql

#创建用户
groupadd mysql
useradd -r -g mysql -s /bin/false mysql

#创建数据目录
mkdir -p /mysql_data/data/s{1..3}
chown mysql:mysql -R /mysql_data/data
chmod 750 -R /mysql_data/data

#初始化

/usr/local/mysql/bin/mysqld --initialize-insecure --basedir=/usr/local/mysql --datadir=/mysql_data/data/s1 --user=mysql
/usr/local/mysql/bin/mysqld --initialize-insecure --basedir=/usr/local/mysql --datadir=/mysql_data/data/s2 --user=mysql
/usr/local/mysql/bin/mysqld --initialize-insecure --basedir=/usr/local/mysql --datadir=/mysql_data/data/s3 --user=mysql

#启动

/usr/local/mysql/bin/mysqld_safe  --defaults-file=/etc/my3306.cnf  --user=mysql &

/usr/local/mysql/bin/mysqld_safe  --defaults-file=/etc/my3307.cnf  --user=mysql &

/usr/local/mysql/bin/mysqld_safe  --defaults-file=/etc/my3308.cnf  --user=mysql &

2、MGR配置

plugin_load_add='group_replication.so'
group_replication_group_name="aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"
group_replication_start_on_boot=off
group_replication_local_address= "192.168.5.130:33061"
group_replication_group_seeds= "192.168.5.130:33061,192.168.5.130:33062,192.168.5.130:33063"
group_replication_bootstrap_group=off
group_replication_unreachable_majority_timeout=60
group_replication_single_primary_mode = 1

3、主库执行(首次启动组的过程称为引导，只需要在其中一台服务器上执行一次，此库即为主库)

CREATE USER repl@'%' IDENTIFIED BY 'mysqldb@1025';
GRANT REPLICATION SLAVE ON *.* TO repl@'%';
FLUSH PRIVILEGES;

CHANGE MASTER TO MASTER_USER='repl', MASTER_PASSWORD='mysqldb@1025' FOR CHANNEL 'group_replication_recovery';

INSTALL PLUGIN group_replication SONAME 'group_replication.so';

首次启动组的过程称为引导，只需要在一台服务器上执行一次，此库即为主库：
SET GLOBAL group_replication_bootstrap_group=ON;
START GROUP_REPLICATION;
SET GLOBAL group_replication_bootstrap_group=OFF;

#查询集群状态
SELECT * FROM performance_schema.replication_group_members;

4、从库执行：
CHANGE MASTER TO MASTER_USER='repl', MASTER_PASSWORD='mysqldb@1025' FOR CHANNEL 'group_replication_recovery';

START GROUP_REPLICATION;

#查询集群状态
SELECT * FROM performance_schema.replication_group_members;

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