Operating Systems
Typhoon supports Container Linux and Fedora Atomic 28 (deprecated). 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 / Flatcar 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 (except Flatcar edge) |
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) |
|