Create kubeconfig for Windows nodes

Big picture

Create kubeconfig for Windows nodes for manual installations of Calico for Windows.

How to

In a manual installation of Calico for Windows, Calico requires a kubeconfig file to access the API server. This section describes how to find an existing calico-node service account used by Calico on Linux side, and then to export the service account token as a kubeconfig file for Calico to use.

note

In general, the node kubeconfig as used by kubelet does not have enough permissions to access Calico-specific resources.

Export calico-node service account token as a kubeconfig file

note

If your Kubernetes version is v1.24.0 or higher, service account token secrets are no longer automatically created. Before continuing, manually create the calico-node service account token:

kubectl apply -f - <<EOF
apiVersion: v1
kind: Secret
metadata:
  name: calico-node-token
  namespace: calico-system
  annotations:
    kubernetes.io/service-account.name: calico-node
type: kubernetes.io/service-account-token
EOF

note

Note: if Calico is installed in kube-system, update the namespace in the above command.

To make the kubeconfig file, you’ll need the URL of your Kubernetes API server.

note

Kubernetes for Windows does not support access to services from the host so you must use the address of your server, not the Kubernetes service IP.

note

Use namespace kube-system instead of calico-system if your Calico installation is non operator-managed.

Set a variable to the URL of your API server:

$ server=https://<server>:<port>

Then, find the secret containing the service account token for the calico-node service account:

$ kubectl get secret -n calico-system | grep calico-node

Inspect the output and find the name of the token, store it in a variable:

$ name=calico-node-token-xxxxx

Extract the parts of the secret, storing them in variables:

$ ca=$(kubectl get secret/$name -o jsonpath='{.data.ca\.crt}' -n calico-system)
$ token=$(kubectl get secret/$name -o jsonpath='{.data.token}' -n calico-system | base64 --decode)
$ namespace=$(kubectl get secret/$name -o jsonpath='{.data.namespace}' -n calico-system | base64 --decode)

Then, output the file:

cat <<EOF > calico-config
apiVersion: v1
kind: Config
clusters:
- name: kubernetes
  cluster:
    certificate-authority-data: ${ca}
    server: ${server}
contexts:
- name: calico-windows@kubernetes
  context:
    cluster: kubernetes
    namespace: calico-system
    user: calico-windows
current-context: calico-windows@kubernetes
users:
- name: calico-windows
  user:
    token: ${token}
EOF

Copy this config file to the windows node C:\CalicoWindows\calico-kube-config and set the KUBECONFIG environment variable in config.ps1 to point to it.