Docker Change Port Binding

Question

I'm running a container (let's call it old_container) with exposed port 80 and bind the port to the host interface on port 80 using the -p flag.

sudo docker run -p 80:80 -i -t < old-image-id >

In my production environment I want to switch now from the old_container to a new_container. So I want to shut down the old_container and start the new_container.

First I have to do some manual changes in the new_container. So I run it without the -p flag, as I cannot bind it to port 80 before I have done this changes.

sudo docker run -i -t < new-image-id >
#now I m doing my manual changes

When I'm finished with my changes I logout of the new_container. My plan was now to stop the old_container and bind the new_container to port 80. But the [start][1] command does not provide a port binding possibility.

So to come to my question: I'm looking to set the port binding for a stopped container, preferably without the workaround of creating a commit image of the new_container and running this image as another new container.

Answer 1

1. Make the changes to your new container and then stop both the old and new containers.

docker stop old_container new_container

2. Create a new image from a container’s changes via the commit command like so:

docker commit new_container new_container_01

3. Run the newly commited image:

docker run -p 80:80 -i -t new_container_01

4. Cleanup your old, unused containers with the rm (remove) command:

docker rm old_container new_container