> If I'm running nginx on Debian I have to worry about Debian and Debian's version of nginx. This is kind of a funny example to me because it’s one of the reas

> If I'm running nginx on Debian I have to worry about Debian and Debian's version of nginx. This is kind of a funny example to me because it’s one of the reasons I liked containers so much when I first encountered them: Debian’s packages are notoriously old, and anytime I wanted to run a newer version of something I’d wind up with some patchwork of configuration management code and shell scripts. In contrast, a Dockerfile provides a simple and clear way to run whichever version I want without messing with the base system, and even multiple versions of a given package with conflicting dependencies on the same machine without any fuss.