Update networking in a live container

Provide documentation to map an additional port in a running container.
Aqsaxvv092 · Jun 17, 2016 · 8e35472 · 8e35472
1 parent 8eece99
commit 8e35472
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/README.md b/README.md
@@ -348,7 +348,11 @@ You can tell Docker that the container listens on the specified network ports at
 EXPOSE <CONTAINERPORT>
 ```
 
-But note that EXPOSE does not expose the port itself, only `-p` will do that.
+But note that EXPOSE does not expose the port itself, only `-p` will do that. To expose the container's port on your localhosts port:
+
+```
+iptables -t nat -A DOCKER -p tcp --dport <LOCALHOSTPORT> -j DNAT --to-destination <CONTAINERIP>:<PORT>
+```
 
 If you're running Docker in Virtualbox, you then need to forward the port there as well, using [forwarded_port](https://docs.vagrantup.com/v2/networking/forwarded_ports.html).  It can be useful to define something in Vagrantfile to expose a range of ports so that you can dynamically map them: