注意:

1、主库1：10.1.131.75，主库2：10.1.131.76

2、server-id必须是纯数字，并且主从两个server-id在局域网内要唯一。

【主节点1】

vi /etc/my.cnf

[mysqld]

log-bin=mysql-bin

server-id=2019001

log_slave_updates=1

重启服务

service mysqld restart

【主节点2】

vi /etc/my.cnf

[mysqld]

log-bin=mysql-bin

server-id=2019002

log_slave_updates=1

重启服务

service mysqld restart

【主节点1】

mysql> CREATE USER 'repl'@'10.1.131.76' IDENTIFIED WITH mysql_native_password BY 'XXXXXX';

mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'10.1.131.76';

mysql> flush privileges;

获取主节点当前binary log文件名和位置(position)

mysql> SHOW MASTER STATUS;

+------------------+----------+--------------+------------------+-------------------+

| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

+------------------+----------+--------------+------------------+-------------------+

| mysql-bin.000001 | 155 | | | |

+------------------+----------+--------------+------------------+-------------------+

【主节点2】

mysql> CHANGE MASTER TO MASTER_HOST='10.1.131.75',MASTER_USER='repl',MASTER_PASSWORD='XXXXXX',MASTER_LOG_FILE='mysql-bin.000001',MASTER_LOG_POS=155;

【主节点2】

mysql> CREATE USER 'repl'@'10.1.131.75' IDENTIFIED WITH mysql_native_password BY 'XXXXXX';

mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'10.1.131.75';

mysql> flush privileges;

获取主节点当前binary log文件名和位置(position)

mysql> SHOW MASTER STATUS;

+------------------+----------+--------------+------------------+-------------------+

| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

+------------------+----------+--------------+------------------+-------------------+

| mysql-bin.000001 | 178 | | | |

+------------------+----------+--------------+------------------+-------------------+

【主节点1】

mysql> CHANGE MASTER TO MASTER_HOST='10.1.131.76',MASTER_USER='repl',MASTER_PASSWORD='XXXXXX',MASTER_LOG_FILE='mysql-bin.000001',MASTER_LOG_POS=178;

【主节点2】

开启主从同步

mysql> start slave;

再查看主从同步状态

mysql> show slave status\G;

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 10.1.131.75

Master_User: repl

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: mysql-bin.000001

Read_Master_Log_Pos: 155

Relay_Log_File: localhost-relay-bin.000002

Relay_Log_Pos: 322

Relay_Master_Log_File: mysql-bin.000001

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

【主节点1】

开启主从同步

mysql> start slave;

再查看主从同步状态

mysql> show slave status\G;

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 10.1.131.76

Master_User: repl

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: mysql-bin.000001

Read_Master_Log_Pos: 178

Relay_Log_File: localhost-relay-bin.000002

Relay_Log_Pos: 322

Relay_Master_Log_File: mysql-bin.000001

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

注意看Slave_IO_Running和Slave_SQL_Running，必须都是YES，如果Slave_IO_Running是No，通常都是server-id配置有问题。