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07-kubectl.md

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Configuring the Kubernetes Client - Remote Access

Run the following commands from the machine which will be your Kubernetes Client

Download and Install kubectl

OS X

wget https://storage.googleapis.com/kubernetes-release/release/v1.7.0/bin/darwin/amd64/kubectl
chmod +x kubectl
sudo mv kubectl /usr/local/bin

Linux

wget https://storage.googleapis.com/kubernetes-release/release/v1.7.0/bin/linux/amd64/kubectl
chmod +x kubectl
sudo mv kubectl /usr/local/bin

Configure Kubectl

In this section you will configure the kubectl client to point to the Kubernetes API Server Frontend Load Balancer.

KUBERNETES_PUBLIC_ADDRESS=$(gcloud compute addresses describe kubernetes-the-hard-way \
  --region us-central1 \
  --format 'value(address)')

Also be sure to locate the CA certificate created earlier. Since we are using self-signed TLS certs we need to trust the CA certificate so we can verify the remote API Servers.

Build up the kubeconfig entry

The following commands will build up the default kubeconfig file used by kubectl.

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

At this point you should be able to connect securly to the remote API server:

kubectl get componentstatuses

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

kubectl get nodes

NAME      STATUS    AGE       VERSION
worker0   Ready     7m        v1.6.1
worker1   Ready     5m        v1.6.1
worker2   Ready     2m        v1.6.1