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# Operating Systems
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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:
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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.
* Container Linux: Gentoo core, rkt-fly, docker
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* Fedora CoreOS: rpm-ostree, podman, moby
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## Host Properties
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| Property | Container Linux / Flatcar Linux | Fedora CoreOS |
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|-------------------|---------------------------------|---------------|
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| Ignition system | Ignition v2.x spec | Ignition v3.x spec |
| Container Engine | docker | docker |
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| storage driver | overlay2 | overlay2 |
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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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## Kubernetes Properties
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| Property | Container Linux | Fedora CoreOS |
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|-------------------|-----------------|---------------|
| single-master | all platforms | all platforms |
| multi-master | all platforms | all platforms |
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| control plane | static pods | static pods |
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| kubelet image | upstream hyperkube | upstream hyperkube |
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| control plane images | upstream hyperkube | upstream hyperkube |
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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 |
