用ssh 进行端口影射

ssh

-g      Allows remote hosts to connect to local forwarded ports.
     

-L [bind_address:]port:host:hostport
	     Specifies that the given port on the local (client) host is to be
	     forwarded to the given host and port on the remote side.  This
	     works by allocating a socket to listen to port on the local side,
	     optionally bound to the specified bind_address.  Whenever a con-
	     nection is made to this port, the connection is forwarded over
	     the secure channel, and a connection is made to host port
	     hostport from the remote machine.	Port forwardings can also be
	     specified in the configuration file.  IPv6 addresses can be spec-
	     ified with an alternative syntax:
	     [bind_address/]port/host/hostport or by enclosing the address in
	     square brackets.  Only the superuser can forward privileged
	     ports.  By default, the local port is bound in accordance with
	     the GatewayPorts setting.	However, an explicit bind_address may
	     be used to bind the connection to a specific address.  The
	     bind_address of ``localhost'' indicates that the listening port
	     be bound for local use only, while an empty address or '*' indi-
	     cates that the port should be available from all interfaces.

ssh -gL [bind_address:]port:host:hostport host

这样就可以forward到host上的某个端口上了.
如果退出了该ssh连接,则取消了该"服务"