LAMP based dynamic DNS over HTTP(s) on premises

For internal infrastructure tasks, we needed a simple, robust and reliable tool for dynamic DNS updates.

We were not aware of any DDNS provider completely meeting our requirements. Neither did various approaches out in the wild. Also we prefer processing sensitive data on premises anyway. In the end, I decided to refactor a set of legacy tools I once had quickly written (and which soon had become a “persistent interim” for some years).