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Setting up Authentication

KUBERNETES_PUBLIC_ADDRESS=$(gcloud compute addresses describe kubernetes \
  --format 'value(address)')

Authentication

kubelet (client)
Kubernetes API Server (server)

The other components, mainly the scheduler and controller manager, access the Kubernetes API server locally over the insecure API port which does not require authentication. The insecure port is only enabled for local access.

Generate a token:

BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ')

Generate a token file:

cat > token.csv <<EOF
${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF

Copy the token.csv file to each controller node:

KUBERNETES_CONTROLLERS=(controller0 controller1 controller2)

for host in ${KUBERNETES_CONTROLLERS[*]}; do
  gcloud compute copy-files token.csv ${host}:~/
done

Client Authentication Configs

bootstrap kubeconfig

Generate a bootstrap kubeconfig file:

kubectl config set-cluster kubernetes-the-hard-way \
  --certificate-authority=ca.pem \
  --embed-certs=true \
  --server=https://${KUBERNETES_PUBLIC_ADDRESS}:6443 \
  --kubeconfig=bootstrap.kubeconfig

kubectl config set-credentials kubelet-bootstrap \
  --token=${BOOTSTRAP_TOKEN} \
  --kubeconfig=bootstrap.kubeconfig

kubectl config set-context default \
  --cluster=kubernetes-the-hard-way \
  --user=kubelet-bootstrap \
  --kubeconfig=bootstrap.kubeconfig

kubectl config use-context default --kubeconfig=bootstrap.kubeconfig

kube-proxy kubeconfig

kubectl config set-cluster kubernetes-the-hard-way \
  --certificate-authority=ca.pem \
  --embed-certs=true \
  --server=https://${KUBERNETES_PUBLIC_ADDRESS}:6443 \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config set-credentials kube-proxy \
  --client-certificate=kube-proxy.pem \
  --client-key=kube-proxy-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config set-context default \
  --cluster=kubernetes-the-hard-way \
  --user=kube-proxy \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

Distribute client authentication configs

Copy the bootstrap kubeconfig file to each worker node:

KUBERNETES_WORKER_NODES=(worker0 worker1 worker2)

for host in ${KUBERNETES_WORKER_NODES[*]}; do
  gcloud compute copy-files bootstrap.kubeconfig kube-proxy.kubeconfig ${host}:~/
done

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