MySQL 互为主备的实现教程

A<-->B 数据互通
首先A客户机和B客户机要互通

为了方便使用，本文ip不再以明文方式显示
"C:\Windows\System32\drivers\etc\hosts"  在这里修改ip
192.168.124.88 node1   
192.168.124.44 node2
其中node1和node2为客户机ip
数据库A 为node1，数据库B 为node2

server-id=1
log-bin=mysql-bin
binlog_format=ROW
gtid_mode=ON
enforce_gtid_consistency=ON
log_slave_updates=ON
auto_increment_increment=2
auto_increment_offset=1

server-id=2
log-bin=mysql-bin
binlog_format=ROW
gtid_mode=ON
enforce_gtid_consistency=ON
log_slave_updates=ON
auto_increment_increment=2
auto_increment_offset=2

STOP REPLICA;
RESET REPLICA ALL;
RESET MASTER;  --必须执行，且执行后不得再有任何数据库操作

CREATE USER 'repl'@'%' IDENTIFIED BY 'Repl@123456';

GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';

FLUSH PRIVILEGES;

-- 下面两条是为了改密码配置，8.0以上直接执行就行
ALTER USER 'repl'@'%' IDENTIFIED WITH mysql_native_password BY 'Repl@123456';

FLUSH PRIVILEGES;

STOP REPLICA;
RESET REPLICA ALL;
RESET MASTER;


如果在数据库A已经创建，数据库B中可以无需操作，会自动同步过来
CREATE USER 'repl'@'%' IDENTIFIED BY 'Repl@123456';

GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';

FLUSH PRIVILEGES;


ALTER USER 'repl'@'%' IDENTIFIED WITH mysql_native_password BY 'Repl@123456';

FLUSH PRIVILEGES;

CHANGE REPLICATION SOURCE TO
SOURCE_HOST='node1',
SOURCE_PORT=3306,
SOURCE_USER='repl',
SOURCE_PASSWORD='Repl@123456',
SOURCE_AUTO_POSITION=1;

START REPLICA;
-- 到这就结束了

	-- 验证是否互通
SHOW REPLICA STATUS;

Replica_IO_Running: Yes
Replica_SQL_Running: Yes

Seconds_Behind_Source: 0

CHANGE REPLICATION SOURCE TO
SOURCE_HOST='node2',
SOURCE_PORT=3306,
SOURCE_USER='repl',
SOURCE_PASSWORD='Repl@123456',
SOURCE_AUTO_POSITION=1;

START REPLICA;
-- 到这就结束了

	-- 验证是否互通
SHOW REPLICA STATUS;

Replica_IO_Running: Yes
Replica_SQL_Running: Yes

Seconds_Behind_Source: 0