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* Typhoon for Fedora Atomic uses system containers, container images containing metadata, but built directly from upstream and published and serve through Quay.io * https://github.com/poseidon/system-containers
90 lines
3.7 KiB
Markdown
90 lines
3.7 KiB
Markdown
# Operating Systems
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Typhoon supports [Container Linux](https://coreos.com/why/) and Fedora [Atomic](https://www.projectatomic.io/) 28. These two 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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* Container Linux: Gentoo core, rkt-fly, docker
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* Fedora Atomic: RHEL core, rpm-ostree, system containers (i.e. runc), CRI-O (future)
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## Host Properties
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| Property | Container Linux | Fedora Atomic |
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|-------------------|-----------------|---------------|
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| host spec (bare-metal) | Container Linux Config | kickstart, cloud-init |
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| host spec (cloud) | Container Linux Config | cloud-init |
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| container runtime | docker | docker (CRIO planned) |
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| cgroup driver | cgroupfs | systemd |
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| logging driver | json-file | journald |
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| storage driver | overlay2 | overlay2 |
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## Kubernetes Properties
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| Property | Container Linux | Fedora Atomic |
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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 | self-hosted | self-hosted |
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| kubelet image | upstream hyperkube | upstream hyperkube via [system container](https://github.com/poseidon/system-containers) |
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| control plane images | upstream hyperkube | upstream hyperkube |
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| on-host etcd | rkt-fly | system container (runc) |
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| on-host kubelet | rkt-fly | system container (runc) |
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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 | manual (planned) |
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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/kubernetes/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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## Kubelet Mounts
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### Container Linux
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| Mount location | Host location | Options |
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|-------------------|-------------------|---------|
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| /etc/kubernetes | /etc/kubernetes | ro |
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| /etc/ssl/certs | /etc/ssl/certs | ro |
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| /usr/share/ca-certificates | /usr/share/ca-certificates | ro |
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| /var/lib/kubelet | /var/lib/kubelet | recursive |
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| /var/lib/docker | /var/lib/docker | |
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| /var/lib/cni | /var/lib/cni | |
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| /var/lib/calico | /var/lib/calico | |
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| /var/log | /var/log | |
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| /etc/os-release | /usr/lib/os-release | ro |
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| /run | /run | |
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| /lib/modules | /lib/modules | ro |
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| /etc/resolv.conf | /etc/resolv.conf | |
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| /opt/cni/bin | /opt/cni/bin | |
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### Fedora Atomic
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| Mount location | Host location | Options |
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|--------------------|------------------|---------|
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| /rootfs | / | ro |
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| /etc/kubernetes | /etc/kubernetes | ro |
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| /etc/ssl/certs | /etc/ssl/certs | ro |
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| /etc/pki/tls/certs | /usr/share/ca-certificates | ro |
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| /var/lib | /var/lib | |
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| /var/lib/kubelet | /var/lib/kubelet | recursive |
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| /var/log | /var/log | ro |
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| /etc/os-release | /etc/os-release | ro |
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| /var/run/secrets | /var/run/secrets | |
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| /run | /run | |
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| /lib/modules | /lib/modules | ro |
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| /etc/hosts | /etc/hosts | ro |
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| /etc/resolv.conf | /etc/resolv.conf | ro |
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| /opt/cni/bin | /opt/cni/bin (changing in future) | |
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