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Lab 13 - Namespaces and DNS

Introduction

In this lab, you will create and interrogate resources in namespaces and view their DNS names.

Step 1 - Authenticate to the TKG Service (if necessary)

The Authentication token stored in your local KUBECONFIG file expires every 10 hours. You will want to re-authenticate to the TKG Service before starting the lab to ensure you have access to the Supervisor cluster.

Run:

kubectl vsphere login --server=[vSphere Control Plane Endpoint] --tanzu-kubernetes-cluster-namespace=poc --tanzu-kubernetes-cluster-name=alphacluster

After successful authentication, change your Kubernetes context to the alphacluster by running:

kubectl config use-context alphacluster

Note: See the Authenticate lab for more a more detailed refresher on the procedures.

Step 2 - Create a Kubernetes Namespace

Either use the imperative command:

kubectl create namespace tigerteam

or

apply the yaml file

apiVersion: v1
kind: Namespace
metadata:
  name: tigerteam

Verify that the namespace was created successfully by running:

kubectl get ns

Step 3 - Deploy Resources into the Namespace

Use the YAML file found here to deploy nginx pods and a service.

kubectl apply -f nginx-tigerteam.yaml

Verify that the pods and services were deployed correctly.

kubectl get pods -n tigerteam
kubectl get svc -n tigerteam

Step 4 - Deploy a Utility Pod to test Name Resolution

From within the default namespace deploy a busybox pod and exec into the pod to a shell.

kubectl run curlpod -it --image=curlimages/curl -- sh

Once you have a shell terminal see if you can resolve the app1 service.

nslookup app1.tigerteam.svc.cluster.local

nslookup command result

See what happens when you run nslookup without specifying the namespace.

nslookup app1

Now see if you can curl the nginx service in the tigerteam namespace.

kubectl run curlpod -it --image=curlimages/curl -- sh

curl command result

Exit the utility pod shell by typing:

exit

Step 5 - Cleanup the Lab

Delete the tigerteam pods and services.

kubectl delete -f nginx-tigerteam.yaml

Delete the tigerteam namespace

kubectl delete ns tigerteam

Delete the utility pod

kubectl delete pod utility

Challenge - Where is the Kubernetes Control Plane ???

Kubernetes clusters run many of the control plane components as containers. They may be hiding in one of the other namespaces. Can you find:

  • The Kubernetes API Server
  • The DNS Server