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mysql> select user, host from user where user = 'root';
+------+-----------+
| user | host |
+------+-----------+
| root | localhost |
+------+-----------+
1 row in set (0.01 sec)
ssh -gNf -L 端口1:localhost:3306 用户@主机A
ssh -gNf -L 端口2:127.0.0.1:3306 用户@主机A
mysql -uroot -p -h 主机B -P端口
ERROR 1045 (00000): Access denied for user: 'root@127.0.0.1' (Using password: YES)