前台的ssh隧道适用于mysql主机localhost，后台的ssh隧道适用于mysql主机127.0.0.1
我在这里尝试的是将所有连接转发到端口3306上机器1上的localhost到端口3306上本地主机上的机器2。因此，如果您在机器1上连接到mysql，它的行为就像您在机器2上连接一样 我认为ssh隧道应该转发特定端口上的通信量，而不是让我登录到另一台机器上。（就像这里一样）我尝试过在“@machine-two-hostname.com”之前不使用“admin”，这也会做同样的事情。正如标题所说的，在后台运行它不允许我在“localhost”上连接，当我尝试在“bind address ready in use”的相同端口上设置另一个ssh隧道时，它会给我一条新消息我怀疑下面运行的命令也不起作用，但它只是将我登录到另一台机器上，而没有连接端口前台的ssh隧道适用于mysql主机localhost，后台的ssh隧道适用于mysql主机127.0.0.1,mysql,ssh,ssh-tunnel,Mysql,Ssh,Ssh Tunnel,我在这里尝试的是将所有连接转发到端口3306上机器1上的localhost到端口3306上本地主机上的机器2。因此，如果您在机器1上连接到mysql，它的行为就像您在机器2上连接一样 我认为ssh隧道应该转发特定端口上的通信量，而不是让我登录到另一台机器上。（就像这里一样）我尝试过在“@machine-two-hostname.com”之前不使用“admin”，这也会做同样的事情。正如标题所说的，在后台运行它不允许我在“localhost”上连接，当我尝试在“bind address ready
admin@machine-one:~$ ssh -L 3306:localhost:3306 admin@machine-two-hostname.com
Linux machine-two 4.9.0-6-amd64 #1 SMP Debian 4.9.88-1+deb9u1 (2018-05-07) x86_64
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/\*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Wed Jun 20 11:16:07 2018 from 172.31.93.22
admin@machine-two:~$ mysql -uroot -proot-pass
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 19
Server version: 10.1.26-MariaDB-0+deb9u1 Debian 9.1
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> \q
Bye
admin@machine-two:~$ exit
logout
Connection to machine-two-hostname.com closed.
admin@machine-one:~$ ssh -fN -L 3306:localhost:3306 admin@machine-two-hostname.com
admin@machine-one:~$ mysql -uroot -proot-pass
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2 "No such file or directory")
admin@machine-one:~$ ssh -fN -L 3306:localhost:3306 machine-two-hostname.com
admin@machine-one:~$ mysql -uroot -proot-pass -hlocalhost
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2 "No such file or directory")
admin@machine-one:~$ mysql -uroot -proot-pass --protocol=TCP -hlocalhost
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 23
Server version: 10.1.26-MariaDB-0+deb9u1 Debian 9.1
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>
admin@machine-one:~$ mysql -uroot -proot-pass -hlocalhost
ERROR 2002 (HY000): Cant connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2 "No such file or directory")
admin@machine-one:~$ mysql -uroot -proot-pass -h127.0.0.1
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 20
Server version: 10.1.26-MariaDB-0+deb9u1 Debian 9.1
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>
shell> mysql --host=127.0.0.1
shell> mysql --protocol=TCP
admin@machine-one:~$ ssh -fN -L 3306:localhost:3306 machine-two-hostname.com
admin@machine-one:~$ mysql -uroot -proot-pass -hlocalhost
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2 "No such file or directory")
admin@machine-one:~$ mysql -uroot -proot-pass --protocol=TCP -hlocalhost
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 23
Server version: 10.1.26-MariaDB-0+deb9u1 Debian 9.1
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>