Flatcar: OS innovation with systemd-sysext
Flatcar Container Linux has a strong focus on backwards compatibility. Being a continuation of the CoreOS Container Linux project which started more than 10 years ago, the main design stayed as is. Flatcar ships a fixed set of software and users should rely on containers for the rest. This has proven successful but there are some scenarios where one has to extend Flatcar in ways the original design wasn’t intended for.