typhoon/docs/architecture/operating-systems.md

Operating Systems

Typhoon supports Container Linux, Flatcar Linux and Fedora CoreOS (preview). These operating systems were chosen because they offer:

• Minimalism and focus on clustered operation
• Automated and atomic operating system upgrades
• Declarative and immutable configuration
• Optimization for containerized applications

Together, they diversify Typhoon to support a range of container technologies.

• Container Linux: Gentoo core, rkt-fly, docker
• Fedora CoreOS: rpm-ostree, podman, moby

Host Properties

Property	Container Linux / Flatcar Linux	Fedora CoreOS
Ignition system	Ignition v2.x spec	Ignition v3.x spec
Container Engine	docker	docker
storage driver	overlay2	overlay2
logging driver	json-file	journald
cgroup driver	cgroupfs (except Flatcar edge)	systemd
Networking	systemd-networkd	NetworkManager
Username	core	core

Kubernetes Properties

Property	Container Linux	Fedora CoreOS
single-master	all platforms	all platforms
multi-master	all platforms	all platforms
control plane	self-hosted	self-hosted
kubelet image	upstream hyperkube	upstream hyperkube
control plane images	upstream hyperkube	upstream hyperkube
on-host etcd	rkt-fly	podman
on-host kubelet	rkt-fly	podman
CNI plugins	calico or flannel	calico or flannel
coordinated drain & OS update	CLUO addon	(planned)

Directory Locations

Typhoon conventional directories.

Kubelet setting	Host location
cni-conf-dir	/etc/kubernetes/cni/net.d
pod-manifest-path	/etc/kubernetes/manifests
volume-plugin-dir	/var/lib/kubelet/volumeplugins