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10-configuring-kubectl.md

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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 (replace MY_PUBLIC_IP_ADDRESS with your public IP address on the gateway-01 VM):

KUBERNETES_PUBLIC_ADDRESS=MY_PUBLIC_IP_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

Verification

Check the health of the remote Kubernetes cluster:

kubectl get componentstatuses

Output:

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

List the nodes in the remote Kubernetes cluster:

kubectl get nodes

Output:

NAME       STATUS   ROLES    AGE   VERSION
worker-0   Ready    <none>   90s   v1.21.5
worker-1   Ready    <none>   91s   v1.21.5
worker-2   Ready    <none>   90s   v1.21.5

Next: Provisioning Pod Network Routes