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typhoon/docs/architecture/operating-systems.md
Dalton Hubble c3bf8bcf96 Add Fedora CoreOS to issue template and docs 
* Update several Container Linux references to start
referring to Flatcar Linux
* Update docs and mentions of Fedora CoreOS
2020-03-25 00:36:15 -07:00

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Operating Systems

Typhoon supports Fedora CoreOS, Flatcar Linux and Container Linux (EOL in May 2020). 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.

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

Host Properties

Property Flatcar Linux Fedora CoreOS
Kernel ~4.19.x ~5.5.x
systemd 241 243
Ignition system Ignition v2.x spec Ignition v3.x spec
Container Engine docker 18.06.3-ce docker 18.09.8
storage driver overlay2 (extfs) overlay2 (xfs)
logging driver json-file journald
cgroup driver cgroupfs (except Flatcar edge) systemd
Networking systemd-networkd NetworkManager
Username core core

Kubernetes Properties

Property Flatcar Linux Fedora CoreOS
single-master all platforms all platforms
multi-master all platforms all platforms
control plane static pods static pods
kubelet image kubelet image with upstream binary kubelet image with upstream binary
control plane images upstream images upstream images
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