Configuring kubectl for Remote Access

In this lab you will generate a kubeconfig file for the kubectl command line utility based on the admin user credentials.

Run the commands in this lab from the same directory used to generate the admin client certificates.

The Admin Kubernetes Configuration File

Each kubeconfig requires a Kubernetes API Server to connect to. To support high availability the IP address assigned to the external load balancer fronting the Kubernetes API Servers will be used.

Generate a kubeconfig file suitable for authenticating as the admin user:

{
  KUBERNETES_PUBLIC_ADDRESS=$(gcloud compute addresses describe kubernetes-the-hard-way \
    --region $(gcloud config get-value compute/region) \
    --format 'value(address)')

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

  kubectl config set-credentials admin \
    --client-certificate=admin.pem \
    --client-key=admin-key.pem

  kubectl config set-context kubernetes-the-hard-way \
    --cluster=kubernetes-the-hard-way \
    --user=admin

  kubectl config use-context kubernetes-the-hard-way
}

Cluster "kubernetes-the-hard-way" set.
User "admin" set.
Context "kubernetes-the-hard-way" created.
Switched to context "kubernetes-the-hard-way".

Verification

Check the health of the remote Kubernetes cluster:

kubectl get componentstatuses

NAME                 STATUS    MESSAGE             ERROR
scheduler            Healthy   ok
controller-manager   Healthy   ok
etcd-0               Healthy   {"health":"true"}
etcd-1               Healthy   {"health":"true"}
etcd-2               Healthy   {"health":"true"}

List the nodes in the remote Kubernetes cluster:

kubectl get nodes -o wide

NAME       STATUS   ROLES    AGE    VERSION   INTERNAL-IP   EXTERNAL-IP   OS-IMAGE             KERNEL-VERSION    CONTAINER-RUNTIME
worker-0   Ready    <none>   5m9s   v1.12.0   10.240.0.20   <none>        Ubuntu 18.04.1 LTS   4.15.0-1026-gcp   containerd://1.2.0-rc.0
worker-1   Ready    <none>   5m7s   v1.12.0   10.240.0.21   <none>        Ubuntu 18.04.1 LTS   4.15.0-1026-gcp   containerd://1.2.0-rc.0
worker-2   Ready    <none>   5m5s   v1.12.0   10.240.0.22   <none>        Ubuntu 18.04.1 LTS   4.15.0-1026-gcp   containerd://1.2.0-rc.0