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typhoon/docs/architecture/operating-systems.md
Dalton Hubble c52f9f8d08 Upgrade docs packages and refresh content 
* Promote DigitalOcean from alpha to beta for Fedora
CoreOS and Flatcar Linux
* Upgrade mkdocs-material and PyPI packages for docs
* Replace docs mentions of Container Linux with Flatcar
Linux and move docs/cl to docs/flatcar-linux
* Deprecate CoreOS Container Linux support. Its still
usable for some time, but start removing docs
2020-05-20 23:31:26 -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, 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