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Change Flatcar kubelet.service container from rkt to docker

Browse Source 
* Use docker to run the `kubelet.service` container
* Update Kubelet mounts to match Fedora CoreOS
* Remove unused `/etc/ssl/certs` mount (see
https://github.com/poseidon/typhoon/pull/810)
* Remove unused `/usr/share/ca-certificates` mount
* Remove `/etc/resolv.conf` mount, Docker default is ok
* Change `delete-node.service` to use docker instead of rkt
and inline ExecStart, as was done on Fedora CoreOS
* Fix permission denied on shutdown `delete-node`, caused
by the kubeconfig mount changing with the introduction of
node TLS bootstrap

Background

* podmand, rkt, and runc daemonless container process runners
provide advantages over the docker daemon for system containers.
Docker requires workarounds for use in systemd units where the
ExecStart must tail logs so systemd can monitor the daemonized
container. https://github.com/moby/moby/issues/6791
* Why switch then? On Flatcar Linux, podman isn't shipped. rkt
works, but isn't developing while container standards continue
to move forward. Typhoon has used runc for the Kubelet runner
before in Fedora Atomic, but its more low-level. So we're left
with Docker, which is less than ideal, but shipped in Flatcar
* Flatcar Linux appears to be shifting system components to
use docker, which does provide some limited guards against
breakages (e.g. Flatcar cannot enable docker live restore)
This commit is contained in:
Dalton Hubble
2020-10-18 22:51:25 -07:00
parent afac46e39a
commit eda78db08e
12 changed files with 279 additions and 432 deletions
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docs/architecture/operating-systems.md
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@ -36,7 +36,7 @@ Together, they diversify Typhoon to support a range of container technologies.
| 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 |
| on-host kubelet | docker | podman |
| CNI plugins | calico, cilium, flannel | calico, cilium, flannel |
| coordinated drain & OS update | [FLUO](https://github.com/kinvolk/flatcar-linux-update-operator) addon | [fleetlock](https://github.com/poseidon/fleetlock) |