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Kubernetes Cluster API Provider Bring Your Own Host (BYOH)


What is Cluster API Provider BYOH

Cluster API brings declarative, Kubernetes-style APIs to cluster creation, configuration and management.

BYOH is a Cluster API Infrastructure Provider for already-provisioned hosts running Linux. This provider allows operators to adopt Cluster API for deploying and managing kubernetes nodes without also having to adopt a specific infrastructure service. This enables users to decouple kubernetes node provisioning from host and infrastructure provisioning.

BYOH Glossary

Host - A host is a running computer system. It could be physical or virtual. It has a kernel and some base operating system

BYO Host - A Linux host provisioned and managed outside of Cluster API

BYOH Capacity Pool - A set of BYO Hosts registered in a management cluster & authorized for usage as a capacity for deploying Kubernetes nodes

Kubernetes Node - A Kubernetes Node that runs on top of a Host. There is a 1-to-1 relationship between nodes and hosts (every host has zero or one nodes). Node provisioning and lifecycle management is a Cluster API responsibility

Kubernetes Host Components - The components that run uncontainerized on the host and are required to bootstrap a Kubernetes node. Typically, this is at least kubelet, containerd and kubeadm, but different OS might require different components in this category

Features

  • Native Kubernetes manifests and API
  • Support for single and multi-node control plane clusters
  • Support already provisioned Linux VMs with Ubuntu 20.04

Getting Started

Check out the getting_started guide for launching a BYOH workload cluster

Community, discussion, contribution, and support

The BringYourOwnHost provider is developed in the open, and is constantly being improved by our users, contributors, and maintainers. If you have questions or want to get the latest project news, you can connect with us in the following ways:

  • Chat with us on the Kubernetes Slack in the #cluster-api channel
  • Subscribe to the SIG Cluster Lifecycle Google Group for access to documents and calendars
  • Join our Cluster API Provider for BringYourOwnHost working group sessions where we share the latest project news, demos, answer questions, and triage issues

Pull Requests and feedback on issues are very welcome! See the issue tracker if you're unsure where to start, especially the Good first issue and Help wanted tags, and also feel free to reach out to discuss.

See also our contributor guide and the Kubernetes community page for more details on how to get involved.

Project Status

This project is currently a work-in-progress, in an Alpha state, so it may not be production ready. There is no backwards-compatibility guarantee at this point. For more details on the roadmap and upcoming features, check out [the project's issue tracker on GitHub][issue].

Getting involved and contributing

Launching a Kubernetes cluster using BYOH source code

Check out the developer guide for launching a BYOH cluster consisting of Docker containers as hosts.

More about development and contributing practices can be found in CONTRIBUTING.md.


Compatibility with Cluster API and Kubernetes Versions

  • BYOH is currently compatible wth Cluster API v1beta1 (v1.0)
  • BYOH installer support is present and tested only for Kubernetes version v1.22.3. You may however use it to provision clusters of a different version by manually installing the Kubernetes components (use the --skip-installation flag when starting the agent)

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