Containers Are Just About One Thing

When a container starts, it has this main process that gets started. And when that process ends, whether that be the app just completing cleanly after finishing its work, or an exception gets thrown, then the container will also end. So imagine you have an architecture with a web front end, two different backend API's, maybe a database, a reddish cache and just say you wanted to run all of those things in containers. The lifetime of the container is the lifetime of that process.