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 | ~5.15.x | ~6.5.x |
| systemd | 252 | 254 |
| 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 |