Getting Started with Containerization

Port management

Now that we know how we can isolate or firewall containers from each other by placing them on different networks, and that we can have a container attached to more than one network, we have one problem that remains unsolved. How can we expose an application service to the outside world? Imagine a container running a web server hosting our webAPI from before. We want customers from the internet to be able to access this API. We have designed it to be a publicly accessible API. To achieve this, we have to, figuratively speaking, open a gate in our firewall through which we can funnel external traffic to our API. For security reasons, we don't just want to open the doors wide, but to have only a single controlled gate through ...