Migrating my NAS from CoreOS/Flatcar Linux to NixOS

In this article, I want to show how to migrate an existing Linux server to NixOS&#xA;— in my case the CoreOS/Flatcar Linux installation on my Network Attached&#xA;Storage (NAS) PC. &#xA; I will show in detail how the previous CoreOS setup looked like (lots of systemd&#xA;units starting Docker containers), how I migrated it into an intermediate state&#xA;(using Docker on NixOS) just to get things…