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Developer Guide

Use this guide to create a local development environment from a fresh checkout. It creates a Kind management cluster, installs Cluster API, and runs the STACKIT provider image you build from this repository. That management cluster then creates workload clusters in STACKIT, so use a project intended for development and expect the workload resources to incur cost.

Before you start

Install:

  • Go
  • Docker
  • kind
  • kubectl
  • clusterctl
  • base64

You also need a STACKIT project, a service-account JSON key, an existing network, an image, and a machine type. The service account needs the permissions listed in IAM permissions.

Clone this repository and run the commands below from its root.

Create the management cluster

The management cluster runs the Cluster API controllers and the provider. It is not the Kubernetes cluster that will run your workload.

Enterprise proxies like Zscaler

If your network uses a TLS-intercepting proxy such as Zscaler, the Kind node must trust the proxy's root certificate. The host's certificate store does not automatically apply inside the Kind node. Create a local kind-config.yaml that mounts the host CA bundle into the node:

cat > kind-config.yaml <<'EOF'
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
  - role: control-plane
    extraMounts:
      - hostPath: /etc/ssl/certs/ca-certificates.crt
        containerPath: /etc/ssl/certs/ca-certificates.crt
        readOnly: true
EOF
kind create cluster --name capi-stackit --config kind-config.yaml

Without such a proxy, create the cluster without the configuration file:

kind create cluster --name capi-stackit

Point kubectl at the new management cluster:

kubectl config use-context kind-capi-stackit

Install Cluster API

Install Cluster API core, bootstrap, and control-plane providers into the management cluster:

clusterctl init \
  --config hack/clusterctl-local.yaml \
  --core cluster-api \
  --bootstrap kubeadm \
  --control-plane kubeadm

hack/clusterctl-local.yaml enables Cluster API features needed by the repository's templates, including ClusterClass and ClusterResourceSet.

Build and deploy the local provider

Build the controller image, load it into the Kind node, and deploy the provider with that image:

export IMG=cluster-api-provider-stackit:dev
make docker-build IMG="${IMG}"
kind load docker-image "${IMG}" --name capi-stackit
make deploy IMG="${IMG}"

Wait until the locally built provider is ready:

kubectl rollout status \
  --namespace cluster-api-provider-stackit-system \
  deployment/cluster-api-provider-stackit-controller-manager

Configure STACKIT and create a workload cluster

The provider is now running from your checkout. Continue with the quick start from set credentials and cluster settings. Create the Secret in the default namespace used there, then create the workload cluster.

Because you are working from a repository checkout, use templates/cluster-template.yaml directly instead of downloading a release asset:

clusterctl generate cluster "${CLUSTER_NAME}" \
  --from templates/cluster-template.yaml \
  --target-namespace "${NAMESPACE}" \
  > cluster.yaml
kubectl apply -f cluster.yaml

When the workload API is available, retrieve the workload kubeconfig:

clusterctl get kubeconfig "${CLUSTER_NAME}" \
  --namespace "${NAMESPACE}" \
  > "${CLUSTER_NAME}".kubeconfig

Install a CNI using the repository helper (hack/install-workload-cni.sh) via make:

make install-workload-cni \
  WORKLOAD_KUBECONFIG="${CLUSTER_NAME}.kubeconfig"

By default, this installs Cilium using templates/addons/cilium-values.yaml. You can also install Calico by setting STACKIT_WORKLOAD_CNI=calico, or apply a custom manifest by setting CNI_MANIFEST=path/to/manifest.yaml. See Workload CNI for more options.

Run the controller on your host

For controller debugging, stop the deployed provider first, keep kind-capi-stackit as the active kubeconfig context, and run:

make undeploy
make run

make run connects to the active management cluster. When you stop it, rebuild, load, and deploy the image again with the commands in the previous section.