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Ubuntu OS

Gardener extension controller for the Ubuntu operating system

Gardener Extension for Ubuntu OS

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This controller operates on the OperatingSystemConfig resource in the API group. It manages those objects that are requesting Ubuntu OS configuration (.spec.type=ubuntu). An experimental support for Ubuntu Pro is added (.spec.type=ubuntu-pro):

kind: OperatingSystemConfig
  name: pool-01-original
  namespace: default
  type: ubuntu

Please find a concrete example in the example folder.

After reconciliation the resulting data will be stored in a secret within the same namespace (as the config itself might contain confidential data). The name of the secret will be written into the resource’s .status field:

      name: osc-result-pool-01-original
      namespace: default
  command: /usr/bin/env bash <path>
  - docker-monitor.service
  - kubelet-monitor.service
  - kubelet.service

The secret has one data key cloud_config that stores the generation.

An example for a ControllerRegistration resource that can be used to register this controller to Gardener can be found here.

Please find more information regarding the extensibility concepts and a detailed proposal here.

How to start using or developing this extension controller locally

You can run the controller locally on your machine by executing make start. Please make sure to have the kubeconfig to the cluster you want to connect to ready in the ./dev/kubeconfig file. Static code checks and tests can be executed by running make verify. We are using Go modules for Golang package dependency management and Ginkgo/Gomega for testing.

Feedback and Support

Feedback and contributions are always welcome. Please report bugs or suggestions as GitHub issues or join our Slack channel #gardener (please invite yourself to the Kubernetes workspace here).

Learn more!

Please find further resources about out project here:

1 - Usage

Using the Ubuntu extension with Gardener as end-user

The resource declares a few fields that must be considered when this OS extension is used.

In this document we describe how this configuration looks like and under which circumstances your attention may be required.

AWS VPC settings for Ubuntu workers

Gardener allows you to create Ubuntu based worker nodes by:

  1. Using a Gardener managed VPC
  2. Reusing a VPC that already exists (VPC id specified in InfrastructureConfig]

If the second option applies to your use-case please make sure that your VPC has enabled DNS Support. Otherwise Ubuntu based nodes aren’t able to join or operate in your cluster properly.

DNS settings (required):

  • enableDnsHostnames: true
  • enableDnsSupport: true