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@dweomer dweomer released this 17 Nov 03:40
· 259 commits to master since this release
v0.7.0-dweomer2
9da924d

Introducing the k3OS Operator

🚧 Work-In-Progress 🚧

Initially focused with providing a kubernetes-native upgrade experience, this change-set enhances the k3os multi-call binary to provide:

  • k3os ops agent custom resource and node controller
  • k3os ops upgrade perform rootfs and kernel upgrades

The k3os-upgrade-rootfs and k3os-upgrade-kernel scripts have been updated to leverage k3os ops upgrade CLI.

The Custom Resource

This change-set also introduces a new custom resource, the UpdateChannel or upchan:

$ kubectl describe upchan -A
Name:         github-releases
Namespace:    k3os-system
Labels:       <none>
Annotations:  k3os.io/node: k3os-21702
API Version:  k3os.io/v1
Kind:         UpdateChannel
Metadata:
  Creation Timestamp:  2019-11-17T02:25:56Z
  Finalizers:
    wrangler.cattle.io/k3os-operator
  Generation:        1
  Resource Version:  377
  Self Link:         /apis/k3os.io/v1/namespaces/k3os-system/updatechannels/github-releases
  UID:               9bd4ecf3-44ea-4d69-b720-09e01b20ad76
Spec:
  Concurrency:  1
  URL:          github-releases://dweomer/k3os
  Version:      v0.7.0-dweomer1
Status:
Events:  <none>

The Resource Controller

Controlling this resource is a DaemonSet running on every k3os node in the cluster. It watches for changes on UpdateChannel.Spec.Version and if a node's installed version differs the controller will attempt to take up one of the UpdateChannel.Status.Updating slots (max of UpdateChannel.Spec.Concurrency) and when successful will schedule a batch Job that invokes k3os ops upgrade. The controller will watch for this job to finish, when it does it will free up the UpdateChannel.Status.Updating slot and schedule a reboot, via goroutine, on a delay of 5 seconds.

Additionally, the controller will notice when UpdateChannel.Spec.Version is latest (or empty) and attempt to poll for the latest release. As there is only one UpdateChannel.Status.Polling slot, only one node will poll at a time and if there are any polling nodes updates will not be triggered.

WARNING, PREVIEW, EXPECT TO RE-IMAGE NODES

This preview should be considered early alpha quality at best.

Do not run it on nodes that you cannot stand to lose any and all data from.

🚧 Work-In-Progress 🚧

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