51 lines
2.2 KiB
Markdown
51 lines
2.2 KiB
Markdown
# Operating Systems
|
|
|
|
Typhoon supports [Container Linux](https://coreos.com/why/), [Flatcar Linux](https://www.flatcar-linux.org/) and [Fedora CoreOS](https://getfedora.org/coreos/) (preview). 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.
|
|
|
|
* Container Linux: Gentoo core, rkt-fly, docker
|
|
* Fedora CoreOS: rpm-ostree, podman, moby
|
|
|
|
## Host Properties
|
|
|
|
| Property | Container Linux / Flatcar Linux | Fedora CoreOS |
|
|
|-------------------|---------------------------------|---------------|
|
|
| Ignition system | Ignition v2.x spec | Ignition v3.x spec |
|
|
| Container Engine | docker | docker |
|
|
| storage driver | overlay2 | overlay2 |
|
|
| logging driver | json-file | journald |
|
|
| cgroup driver | cgroupfs (except Flatcar edge) | systemd |
|
|
| Networking | systemd-networkd | NetworkManager |
|
|
| Username | core | core |
|
|
|
|
## Kubernetes Properties
|
|
|
|
| Property | Container 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](https://github.com/poseidon/kubelet) with upstream binary | kubelet [image](https://github.com/poseidon/kubelet) 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](https://github.com/coreos/container-linux-update-operator) 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 |
|
|
|