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Update networking in a live container

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Provide documentation to map an additional port in a running container.
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Alejandro Sánchez Acosta 2016-06-17 10:59:16 -07:00 • committed by GitHub
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@ -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: