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typhoon/docs/architecture/operating-systems.md
Dalton Hubble 16c2785878 Update docs on using Butane snippets for customization 
* Typhoon now consistently uses Butane Configs for snippets
(variant `fcos` or `flatcar`). Previously snippets were either
Butane Configs (on FCOS) or Container Linux Configs (on Flatcar)
* Update docs on uploading Flatcar Linux DigitalOcean images
* Update docs on uploading Fedora CoreOS Azure images
2022-08-03 20:28:53 -07:00

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Operating Systems

Typhoon supports Fedora CoreOS and Flatcar Linux. 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, containerd
  • Flatcar Linux: Gentoo core, docker, containerd

Host Properties

Property Flatcar Linux Fedora CoreOS
Kernel ~5.10.x ~5.16.x
systemd 249 249
Username core core
Ignition system Ignition v3.x spec Ignition v3.x spec
storage driver overlay2 (extfs) overlay2 (xfs)
logging driver json-file journald
cgroup driver systemd systemd
cgroup version v2 v2
Networking systemd-networkd NetworkManager
Resolver systemd-resolved systemd-resolved

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
Container Runtime containerd 1.5.9 containerd 1.6.0
kubelet image kubelet image with upstream binary kubelet image with upstream binary
control plane images upstream images upstream images
on-host etcd docker podman
on-host kubelet docker podman
CNI plugins calico, cilium, flannel calico, cilium, flannel
coordinated drain & OS update FLUO addon fleetlock

Directory Locations

Typhoon conventional directories.

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