[chousuke]

Debian also has debconf, which attempts to be a universal configuration management system, so it'll generate and re-generate configuration files from templates. Unfortunately, in my experience it gets in my way more often than it helps since I usually have separate automation that configures the software anyway.

I use Debian-based systems pretty rarely, so I still haven't figured out how you actually make dpkg regenerate your configuration files properly if you use automation to change a debconf selection and need to reconfigure a package. dpkg-reconfigure seems not to do what I want and just restores the previous value (or prompts interactively, which is not useful) for some reason.