Flatcar: Extending Flatcar: Say 'Goodbye' to torcx and 'Hello' to systemd-sysext
Flatcar is a minimal, immutable, image-based operating system for fully automated, zero-touch container infrastructure. It ships the bare minimum required for running containers at scale - and usually, the answer to questions like “how do I install tool XYZ on Flatcar?” is: “run it in a container”. Sometimes though, “tool XYZ” needs to operate close to the OS itself, and it’s not feasible (or even outright impossible) to run it in a container. Good examples for such tools and applications are custom container runtimes like podman, complex control planes like Kubernetes, and vendor-specific programs like VMware’s open-vm-tools that are only useful in specific environments.