userdata-openshift

command
v2.14.12+incompatible Latest Latest
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Published: Mar 22, 2021 License: Apache-2.0 Imports: 4 Imported by: 0

README

OpenShift userdata

This userdata plugin generates a cloud-init script which can be used to provision a CentOS node to be a OpenShift worker node.

Requirements

OpenShift worker nodes require a "bootstrap token" to start. That token must be a ServiceAccount token which has the permissions to create CSRs. In a default OpenShift installation, that token is located at: openshift-infra/node-bootstrapper Therefore the machine-controller must be started with -bootstrap-token-service-account-name="openshift-infra/node-bootstrapper"

OpenShift has a controller to automatically approve CSRs but that only works with machines from the OpenShift machine-controller. Thus we require a custom controller.

Sidenote: A new node creates 2 CSRs:

  • Kubelet client certificate
  • Kubelet serving certificate

Documentation

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