1： 在my.cnf中打开binlog和相关配置：

log-bin=mysql-bin
server-id=2   ###这个地方需要不一样
skip_name_resolve=ON
relay-log=/var/log/relay-log
relay-log-index=/var/log/relay-log.index

2： 主库上给从库授权：

grant REPLIACTION SLAVE on *.* to slave_user@'172.16.251.%' identified by '123456;
flush privileges;

主库上查看主库的状态：
show master status;  假设结果为：
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000002 |     1147 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+

从库上执行：
CHANGE MASTER TO MASTER_HOST='1.1.1.1,MASTER_PORT=3306,MASTER_USER='slave_user',MASTER_PASSWORD='123456',MASTER_LOG_FILE='mysql-bin.000002',MASTER_LOG_POS=1147;
start slave;
show slave status \G

有下面的字段说明成功
            Slave_IO_Running: Yes
            Slave_SQL_Running: Ye

3：基于GTID的主从复制

在主从库的my.cnf上加上：
gtid_mode=on
enforce-gtid-consistency=on
binlog_gtid_simple_recovery=1

在从库上执行：
MASTER_HOST='1.1.1.1',MASTER_PORT=3306,MASTER_USER='slave_user',MASTER_PASSWORD='123456',master_auto_position=1;
start slave;
show slave status \G