Lab
A Cloud Guru

Creating a Service and Discovering DNS Names in Kubernetes

In this hands-on lab, you will be presented with a three-node cluster. You will be creating a simple nginx deployment, in which you must create a service from that deployment. In order to accomplish this, you will use the kubectl command line to create the deployment. Then, you will expose the deployment to create the service. When you have verified the service is up and running, you will create a busybox pod to test the DNS resolution to that service.

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Path Info

Level

Intermediate

Duration

30m

Published

Mar 31, 2019

Challenge

Create an nginx deployment, and verify it was successful.
Use this command to create an nginx deployment:
```
kubectl run nginx --image=nginx
```
Use this command to verify deployment was successful:
```
kubectl get deployments
```
Challenge

Create a service, and verify the service was successful.
Use this command to create a service:
```
kubectl expose deployment nginx --port 80 --type NodePort
```
Use this command to verify the service was created:
```
kubectl get services
```
Challenge

Create a pod that will allow you to query DNS, and verify it’s been created.
Use the following YAML to create the busybox pod spec:
```
apiVersion: v1
kind: Pod
metadata:
  name: busybox
spec:
  containers:
  - image: busybox:1.28.4
    command:
      - sleep
      - "3600"
    name: busybox
  restartPolicy: Always
```
Use the following command to create the busybox pod:
```
kubectl create -f busybox.yaml
```
Use the following command to verify the pod was created successfully:
```
kubectl get pods
```
Challenge

Perform a DNS query to the service.
Use the following command to query the DNS name of the nginx service:
```
kubectl exec busybox -- nslookup nginx
```
Challenge

Record the DNS name.
Record the name of:
```
&lt;service-name&gt.default.svc.cluster.local
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.