2.3 KiB
2.3 KiB
Operating Systems
Typhoon supports Fedora CoreOS, Flatcar Linux and Container Linux (EOL in May 2020). 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 |