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typhoon/docs/architecture/operating-systems.md

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Add architecture docs on operating systems
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# Operating Systems
Add Fedora CoreOS to issue template and docs * Update several Container Linux references to start referring to Flatcar Linux * Update docs and mentions of Fedora CoreOS
2020-03-25 08:31:18 +01:00
Typhoon supports [Fedora CoreOS](https://getfedora.org/coreos/), [Flatcar Linux](https://www.flatcar-linux.org/) and Container Linux (EOL in May 2020). These operating systems were chosen because they offer:
Add architecture docs on operating systems
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* 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.
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* Fedora CoreOS: rpm-ostree, podman, moby
Add Fedora CoreOS to issue template and docs * Update several Container Linux references to start referring to Flatcar Linux * Update docs and mentions of Fedora CoreOS
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* Flatcar Linux: Gentoo core, rkt-fly, docker
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Add Fedora Atomic announcement and improve docs
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## Host Properties
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Add Fedora CoreOS to issue template and docs * Update several Container Linux references to start referring to Flatcar Linux * Update docs and mentions of Fedora CoreOS
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| Property | Flatcar Linux | Fedora CoreOS |
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|-------------------|---------------------------------|---------------|
Add Fedora CoreOS to issue template and docs * Update several Container Linux references to start referring to Flatcar Linux * Update docs and mentions of Fedora CoreOS
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| Kernel | ~4.19.x | ~5.5.x |
| systemd | 241 | 243 |
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| Ignition system | Ignition v2.x spec | Ignition v3.x spec |
Add Fedora CoreOS to issue template and docs * Update several Container Linux references to start referring to Flatcar Linux * Update docs and mentions of Fedora CoreOS
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| Container Engine | docker 18.06.3-ce | docker 18.09.8 |
| storage driver | overlay2 (extfs) | overlay2 (xfs) |
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| logging driver | json-file | journald |
| cgroup driver | cgroupfs (except Flatcar edge) | systemd |
| Networking | systemd-networkd | NetworkManager |
| Username | core | core |
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Add Fedora Atomic announcement and improve docs
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## Kubernetes Properties
Add Fedora CoreOS to issue template and docs * Update several Container Linux references to start referring to Flatcar Linux * Update docs and mentions of Fedora CoreOS
2020-03-25 08:31:18 +01:00
| Property | Flatcar Linux | Fedora CoreOS |
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|-------------------|-----------------|---------------|
| single-master | all platforms | all platforms |
| multi-master | all platforms | all platforms |
Update CHANGES for control plane static pod switch * Remove old references to bootkube / self-hosted
2019-09-07 22:38:51 +02:00
| control plane | static pods | static pods |
Switch from upstream hyperkube image to individual images * Kubernetes plans to stop releasing the hyperkube container image * Upstream will continue to publish `kube-apiserver`, `kube-controller-manager`, `kube-scheduler`, and `kube-proxy` container images to `k8s.gcr.io` * Upstream will publish Kubelet only as a binary for distros to package, either as a DEB/RPM on traditional distros or a container image on container-optimized operating systems * Typhoon will package the upstream Kubelet (checksummed) and its dependencies as a container image for use on CoreOS Container Linux, Flatcar Linux, and Fedora CoreOS * Update the Typhoon container image security policy to list `quay.io/poseidon/kubelet`as an official distributed artifact Hyperkube: https://github.com/kubernetes/kubernetes/pull/88676 Kubelet Container Image: https://github.com/poseidon/kubelet Kubelet Quay Repo: https://quay.io/repository/poseidon/kubelet
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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 |
| control plane images | upstream images | upstream images |
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| on-host etcd | rkt-fly | podman |
| on-host kubelet | rkt-fly | podman |
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| CNI plugins | calico or flannel | calico or flannel |
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| coordinated drain & OS update | [CLUO](https://github.com/coreos/container-linux-update-operator) addon | (planned) |
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## Directory Locations
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Typhoon conventional directories.
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| 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 |