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16c2785878
* Typhoon now consistently uses Butane Configs for snippets (variant `fcos` or `flatcar`). Previously snippets were either Butane Configs (on FCOS) or Container Linux Configs (on Flatcar) * Update docs on uploading Flatcar Linux DigitalOcean images * Update docs on uploading Fedora CoreOS Azure images
55 lines
2.4 KiB
Markdown
55 lines
2.4 KiB
Markdown
# Operating Systems
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Typhoon supports [Fedora CoreOS](https://getfedora.org/coreos/) and [Flatcar Linux](https://www.flatcar-linux.org/). These operating systems were chosen because they offer:
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* Minimalism and focus on clustered operation
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* Automated and atomic operating system upgrades
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* Declarative and immutable configuration
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* Optimization for containerized applications
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Together, they diversify Typhoon to support a range of container technologies.
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* Fedora CoreOS: rpm-ostree, podman, containerd
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* Flatcar Linux: Gentoo core, docker, containerd
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## Host Properties
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| Property | Flatcar Linux | Fedora CoreOS |
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|-------------------|---------------|---------------|
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| Kernel | ~5.10.x | ~5.16.x |
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| systemd | 249 | 249 |
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| Username | core | core |
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| Ignition system | Ignition v3.x spec | Ignition v3.x spec |
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| storage driver | overlay2 (extfs) | overlay2 (xfs) |
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| logging driver | json-file | journald |
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| cgroup driver | systemd | systemd |
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| cgroup version | v2 | v2 |
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| Networking | systemd-networkd | NetworkManager |
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| Resolver | systemd-resolved | systemd-resolved |
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## Kubernetes Properties
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| Property | Flatcar Linux | Fedora CoreOS |
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|-------------------|---------------|---------------|
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| single-master | all platforms | all platforms |
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| multi-master | all platforms | all platforms |
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| control plane | static pods | static pods |
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| Container Runtime | containerd 1.5.9 | containerd 1.6.0 |
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| kubelet image | kubelet [image](https://github.com/poseidon/kubelet) with upstream binary | kubelet [image](https://github.com/poseidon/kubelet) with upstream binary |
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| control plane images | upstream images | upstream images |
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| on-host etcd | docker | podman |
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| on-host kubelet | docker | podman |
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| CNI plugins | calico, cilium, flannel | calico, cilium, flannel |
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| coordinated drain & OS update | [FLUO](https://github.com/kinvolk/flatcar-linux-update-operator) addon | [fleetlock](https://github.com/poseidon/fleetlock) |
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## Directory Locations
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Typhoon conventional directories.
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| Kubelet setting | Host location |
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|-------------------|--------------------------------|
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| cni-conf-dir | /etc/cni/net.d |
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| pod-manifest-path | /etc/kubernetes/manifests |
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| volume-plugin-dir | /var/lib/kubelet/volumeplugins |
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