mysql對外開放
/etc/mysql/mysql.conf.d/mysqld.cnf
註釋掉
#bind-address        = 127.0.0.1

重啟服務：
service mysql restart

授權
mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '12345678' WITH GRANT OPTION; 
Query OK, 0 rows affected, 1 warning (0.01 sec)

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

mysql匯出命令

mysqldump -h localhost -uroot -p12345678  topvas nvts_cn > nvts_cn-new1.sql