DevOps: Puppet, Docker, and Kubernetes

Accessing containers from outside

Once the container is up, we would like to access it from outside. If you have started the container with the --net=host option, then it can be accessed through the Docker host IP. With --net=none, you can attach the network interface from the public end or through other complex settings. Let's see what happens in by default—where packets are forwarded from the host network interface to the container.

Getting ready

Make sure the Docker daemon is running on the host and you can connect through the Docker client.

How to do it…

1. Let's start a container with the -P option:

   $ docker run --expose 80 -i -d -P --name f20 fedora /bin/bash
   

   This automatically maps any network port of the container to a random high port of the ...