How do I assign a port mapping to an existing Docker container?

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I’m also interested in this problem.

As @Thasmo mentioned, port forwardings can be specified ONLY with docker run (and docker create) command.
Other commands, docker start does not have -p option and docker port only displays current forwardings.

To add port forwardings, I always follow these steps,

  1. stop running container

    docker stop test01

  2. commit the container

    docker commit test01 test02

    NOTE: The above, test02 is a new image that I’m constructing from the test01 container.

  3. re-run from the commited image

    docker run -p 8080:8080 -td test02

Where the first 8080 is the local port and the second 8080 is the container port.

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