linux下mysql主从不同步

1.先在主mysql上进行锁表，防止有写数据库操作。

mysql> flush tables with read lock;
Query OK, 0 rows affected (0.04 sec)

2.备份主数据库，然后在从数据中导入

3.查看主mysql的状态

mysql> show master status\G;
*************************** 1. row ***************************
File: mysqlbin-log.000004
Position: 3357681
Binlog_Do_DB:
Binlog_Ignore_DB: information_schema,mysql,performance_schema,sys
Executed_Gtid_Set:
1 row in set (0.00 sec)

4.停止从同步

mysql> stop slave;
Query OK, 0 rows affected (0.02 sec)

5.修改从mysql

mysql> CHANGE MASTER TO   MASTER_HOST='{主mysqlIP}',  MASTER_USER='{账号}',   MASTER_PASSWORD='{yourpassword}',   MASTER_LOG_FILE='mysqlbin-log.000004',  MASTER_LOG_POS=3357681;

5.重启从同步

mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

6.查看从状态

start slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 主mysqlIP
Master_User: 账号
Master_Port: 端口
Connect_Retry: 60
Master_Log_File: mysqlbin-log.000004
Read_Master_Log_Pos: 3357681
Relay_Log_File: mservice139-relay-bin.000002
Relay_Log_Pos: 323
Relay_Master_Log_File: mysqlbin-log.000004
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB: information_schema,mysql,performance_schema,sys
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: 3357681
Relay_Log_Space: 536
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: 138
Master_UUID: 9c3be8e4-9b93-11e8-9c51-000c2942d5cd
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:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)

只要其中两个状态为yes即可了，

Slave_IO_Running: Yes
Slave_SQL_Running: Yes

7.解锁主mysql

mysql> unlock tables;
Query OK, 0 rows affected (0.00 sec)