In this chapter, we'll explore some advanced and highly interesting areas that probably most developers today are already used to. Infrastructure code is still code, so it should be no different than software code; the same principle should apply. This means that the Docker code should be testable, the builds automatic, and the CI systems connected to our Git servers so they could continuously apply the tests. In addition to this, security checks should be part of the mandatory release process and the logs easy to access, even if the application is scaled on multiple machines. Also note that containers shouldn't be black boxes, and highly performant debugging tools should be available for us to do our work. The good news is that these topics will be covered in this chapter, because all of this can be done easily.