记录一次主从数据不同步，手动同步；
主库：
[jumpserver@SX-Test-Oracle ~]$ /usr/local/mysql/bin/mysql -uroot -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 35007 Server version: 5.5.37-log Source distribution Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>
从库：
[jumpserver@SX-Test-Nginx ~]$ /usr/local/mysql/bin/mysql -uroot -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 14562 Server version: 5.5.37-log Source distribution Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>
开始手动同步：
1、在主库上执行，锁定数据库（当前状态可查询，不可插入），查看同步状态
mysql> flush tables with read lock; Query OK, 0 rows affected (0.01 sec) mysql> show master status; +------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +------------------+----------+--------------+------------------+ | mysql-bin.000491 | 84843181 | sc,dev | mysql | +------------------+----------+--------------+------------------+ 1 row in set (0.00 sec)
2、在主库服务器上执行，导出当前数据库备份，并拷贝到备库服务器上。
[jumpserver@SX-Test-Oracle ~]$ sudo /usr/local/mysql/bin/mysqldump -uroot -p sc >/tmp/sc.20180801
Enter password:
3、在从库上执行，停止从库的同步状态。
mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)
4、在从库上执行，导入主库的备份文件
mysql> source /tmp/sc.20180801 Query OK, 0 rows affected (0.00 sec) Query OK, 0 rows affected (0.00 sec) Query OK, 0 rows affected (0.00 sec)
5、在从库上执行，查看从库的状态，并设置从库的同步节点。
从第1步中的主库show master status信息里的| File| Position两项取值
mysql> show slave status; +----------------+---------------+-------------+-------------+---------------+------------------+---------------------+--------------------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+-------------------------------+---------------+---------------+----------------+----------------+-----------------------------+------------------+ | Slave_IO_State | Master_Host | Master_User | Master_Port | Connect_Retry | Master_Log_File | Read_Master_Log_Pos | Relay_Log_File | Relay_Log_Pos | Relay_Master_Log_File | Slave_IO_Running | Slave_SQL_Running | Replicate_Do_DB | Replicate_Ignore_DB | Replicate_Do_Table | Replicate_Ignore_Table | Replicate_Wild_Do_Table | Replicate_Wild_Ignore_Table | Last_Errno | Last_Error | Skip_Counter | Exec_Master_Log_Pos | Relay_Log_Space | Until_Condition | Until_Log_File | Until_Log_Pos | Master_SSL_Allowed | Master_SSL_CA_File | Master_SSL_CA_Path | Master_SSL_Cert | Master_SSL_Cipher | Master_SSL_Key | Seconds_Behind_Master | Master_SSL_Verify_Server_Cert | Last_IO_Errno | Last_IO_Error | Last_SQL_Errno | Last_SQL_Error | Replicate_Ignore_Server_Ids | Master_Server_Id | +----------------+---------------+-------------+-------------+---------------+------------------+---------------------+--------------------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+-------------------------------+---------------+---------------+----------------+----------------+-----------------------------+------------------+ | | 172.17.23.203 | root | 3306 | 60 | mysql-bin.000491 | 84843181 | SX-Test-Nginx-relay-bin.000002 | 7813930 | mysql-bin.000491 | No | No | sc,dev | | | | | | 0 | | 0 | 84843181 | 7814094 | None | | 0 | No | | | | | | NULL | No | 0 | | 0 | | | 1 | +----------------+---------------+-------------+-------------+---------------+------------------+---------------------+--------------------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+-------------------------------+---------------+---------------+----------------+----------------+-----------------------------+------------------+ 1 row in set (0.00 sec) mysql> change master to master_host ='172.17.23.203',master_user ='root',master_port=3306,master_password='XXXXX',master_log_file ='mysql-bin.000491',master_log_pos=84843181; Query OK, 0 rows affected (0.05 sec)
6，在从库上执行，开启从库同步
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
7、在主库上执行，主库解除锁定
mysql> unlock tables;
Query OK, 0 rows affected (0.00 sec)
至此完成了。