查看master状态

mysql> show master status\G;
*************************** 1. row ***************************
             File: mysql-bin.000002   #binlog正在写入的二进制文件,等下回用到
         Position: 13465              #这个信息下面也会用到
     Binlog_Do_DB: learn
 Binlog_Ignore_DB: mysql,information_schema,performance_schema
Executed_Gtid_Set: cea1268e-c2c9-11e8-9e7d-00502ab853ae:1-56
1 row in set (0.00 sec)

master节点进行锁表,防止写入新数据

mysql> flush tables with read lock;
Query OK, 0 rows affected (0.01 sec)

备份主库

[root@node1 ~]# mysqldump  -uroot -pbaiyongjie learn --set-gtid-purged=OFF > learn.0930.sql

在slave节点还原数据库

[root@node1 ~]# scp learn.0930.sql  node2:/root
root@node2's password: 
learn.0930.sql              100% 2910     1.9MB/s   00:00

[root@node2 ~]# mysqldump  -uroot -pbaiyongjie  
mysql> CREATE DATABASE learn DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;                 
Query OK, 1 row affected (0.00 sec)

mysql> use learn;

mysql> source /root/learn.0930.sql

重新设置同步

mysql> stop slave;

mysql> change master to master_host='10.241.0.10',master_user='myslave',master_password='123456',master_port=3306,master_log_file='mysql-bin.000002',master_log_pos=13465,master_connect_retry=30;

mysql> start slave;

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.241.0.10
                  Master_User: myslave
                  Master_Port: 3306
                Connect_Retry: 30
              Master_Log_File: mysql-bin.000002
          Read_Master_Log_Pos: 13465
               Relay_Log_File: relay-log.000002
                Relay_Log_Pos: 320
        Relay_Master_Log_File: mysql-bin.000002
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: 
          Replicate_Ignore_DB: 
           Replicate_Do_Table: 
       Replicate_Ignore_Table: 
      Replicate_Wild_Do_Table: 
  Replicate_Wild_Ignore_Table: 
                   Last_Errno: 0
                   Last_Error: 
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 13465
              Relay_Log_Space: 561
              Until_Condition: None
               Until_Log_File: 
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File: 
           Master_SSL_CA_Path: 
              Master_SSL_Cert: 
            Master_SSL_Cipher: 
               Master_SSL_Key: 
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error: 
               Last_SQL_Errno: 0
               Last_SQL_Error: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 1
                  Master_UUID: cea1268e-c2c9-11e8-9e7d-00502ab853ae
             Master_Info_File: /data/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 
     Last_SQL_Error_Timestamp: 
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: 
            Executed_Gtid_Set: 43b6cf75-c2cc-11e8-a3eb-001200189925:1-29,
cea1268e-c2c9-11e8-9e7d-00502ab853ae:20-56
                Auto_Position: 0
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)

在主库解锁表

mysql> UNLOCK TABLES;

测试同步是否生效

#在主节点上插入数据
mysql> insert into student set id=10, name='baiyongjie9',grade=18;
Query OK, 1 row affected (0.00 sec)

#到从库查看是否同步
mysql> select * from  student where id=10 and name='baiyongjie9';
+----+-------------+-------+
| id | name        | grade |
+----+-------------+-------+
| 10 | baiyongjie9 |    18 |
+----+-------------+-------+

#可以看到已经可以正常同步了.