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Operating Systems

Typhoon supports Container Linux and Fedora Atomic 27. These two 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 Atomic: RHEL core, rpm-ostree, system containers (i.e. runc), CRI-O (future)

Host Properties

Property Container Linux Fedora Atomic
host spec (bare-metal) Container Linux Config kickstart, cloud-init
host spec (cloud) Container Linux Config cloud-init
container runtime docker docker (CRIO planned)
cgroup driver cgroupfs systemd
logging driver json-file journald
storage driver overlay2 overlay2

Kubernetes Properties

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

Kubelet Mounts

Container Linux

Mount location Host location Options
/etc/kubernetes /etc/kubernetes ro
/etc/ssl/certs /etc/ssl/certs ro
/usr/share/ca-certificates /usr/share/ca-certificates ro
/var/lib/kubelet /var/lib/kubelet recursive
/var/lib/docker /var/lib/docker
/var/lib/cni /var/lib/cni
/var/lib/calico /var/lib/calico
/var/log /var/log
/etc/os-release /usr/lib/os-release ro
/run /run
/lib/modules /lib/modules ro
/etc/resolv.conf /etc/resolv.conf
/opt/cni/bin /opt/cni/bin

Fedora Atomic

Mount location Host location Options
/rootfs / ro
/etc/kubernetes /etc/kubernetes ro
/etc/ssl/certs /etc/ssl/certs ro
/etc/pki/tls/certs /usr/share/ca-certificates ro
/var/lib /var/lib
/var/lib/kubelet /var/lib/kubelet recursive
/var/log /var/log ro
/etc/os-release /etc/os-release ro
/var/run/secrets /var/run/secrets
/run /run
/lib/modules /lib/modules ro
/etc/hosts /etc/hosts ro
/etc/resolv.conf /etc/resolv.conf ro
/opt/cni/bin /opt/cni/bin (changing in future)