这个报错是指此用户没有权限 mysqldump: Got error: 1449: The user specified as a definer ('admin'@'%') does not exist when using LOCK TABLES

解决方法: mysql> GRANT select, lock tables ON dbname.* TO 'admin'@'%'; Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges; Query OK, 0 rows affected (0.00 sec)

添加以上两条即可