Bootkube

Bootkube is a tool for launching self-hosted Kubernetes clusters.

When launched, bootkube will deploy a temporary Kubernetes control-plane (api-server, scheduler, controller-manager), which operates long enough to bootstrap a replacement self-hosted control-plane.

Additionally, bootkube can be used to generate all of the necessary assets for use in bootstrapping a new cluster. These assets can then be modified to support any additional configuration options.

Details of self-hosting

• KubeCon self-hosted presentation video
• Kubernetes self-hosted design document

Guides

• GCE Quickstart
• AWS Quickstart
• Vagrant Single-Node
• Vagrant Multi-Node

Usage

Bootkube has two main commands: render and start.

There is a third, experimental command recover which can help reboot a downed cluster (see below).

Render assets

Bootkube can be used to render all of the assets necessary for bootstrapping a self-hosted Kubernetes cluster. This includes generation of TLS assets, Kubernetes object manifests, and a kubeconfig to connect to the bootstrapped cluster.

To see available options, run:

bootkube render --help

Example:

bootkube render --asset-dir=my-cluster

The resulting assets can be inspected / modified in the generated asset-dir.

Start bootkube

To start bootkube use the start subcommand.

To see available options, run:

bootkube start --help

Example:

bootkube start --asset-dir=my-cluster

When bootkube start is creating Kubernetes resources from manifests, the following order is used:

1. Any Namespace objects are created, in lexicographical order.
2. Any CustomResourceDefinition objects are created, in lexicographical order.
3. Any remaining resources are created, in lexicographical order.

Recover a downed cluster

In the case of a partial or total control plane outage (i.e. due to lost master nodes) an experimental recover command can extract and write manifests from a backup location. These manifests can then be used by the start command to reboot the cluster. Currently recovery from a running apiserver, an external running etcd cluster, or an etcd backup taken from the self hosted etcd cluster are the methods.

For more details and examples see disaster recovery documentation.

Development

See Documentation/development.md for more information.

Getting Involved

Want to contribute to bootkube? Have Questions? We are looking for active participation from the community

You can find us at the #bootkube channel on Kubernetes slack.

Related Links

• Users and Integrations

License

bootkube is under the Apache 2.0 license. See the LICENSE file for details.