Overview

In order to demonstrate how to develop a new Cluster API provider we will use kubebuilder to create an example provider. For more information on kubebuilder and CRDs in general we highly recommend reading the Kubebuilder Book. Much of the information here was adapted directly from it.

This is an infrastructure provider - tasked with managing provider-specific resources for clusters and machines. There are also bootstrap providers, which turn machines into Kubernetes nodes.

Prerequisites

Install kubectl
Install kustomize
Install kubebuilder

tl;dr

MacOSLinux

# Install kubectl
brew install kubernetes-cli

# Install kustomize
brew install kustomize

# Install kubectl
KUBECTL_VERSION=$(curl -sf https://dl.k8s.io/release/stable.txt)
curl -fLO https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl

# Install kustomize
OS_TYPE=linux
curl -sf https://api.github.com/repos/kubernetes-sigs/kustomize/releases/latest |\
  grep browser_download |\
  grep ${OS_TYPE} |\
  cut -d '"' -f 4 |\
  xargs curl -f -O -L
mv kustomize_*_${OS_TYPE}_amd64 /usr/local/bin/kustomize
chmod u+x /usr/local/bin/kustomize

# Install Kubebuilder
os=$(go env GOOS)
arch=$(go env GOARCH)

# download kubebuilder and extract it to tmp
curl -sL https://go.kubebuilder.io/dl/2.1.0/${os}/${arch} | tar -xz -C /tmp/

# move to a long-term location and put it on your path
# (you'll need to set the KUBEBUILDER_ASSETS env var if you put it somewhere else)
sudo mv /tmp/kubebuilder_2.1.0_${os}_${arch} /usr/local/kubebuilder
export PATH=$PATH:/usr/local/kubebuilder/bin