What is Kubernetes - Hands-On Activity

What is Kubernetes

📖 Scenario: Imagine you have many small toy robots that need to work together to build a big castle. You want to control them easily, make sure they keep working even if one breaks, and add more robots when needed. Kubernetes helps you do this but with computer programs instead of robots.

🎯 Goal: Learn the basic idea of Kubernetes by creating a simple setup that shows how it manages containers (small packages of software) to keep applications running smoothly.

📋 What You'll Learn

Create a YAML file that defines a Kubernetes Pod with one container

Add a label to the Pod for identification

Use a simple container image like nginx

Display the Pod configuration

💡 Why This Matters

🌍 Real World

Kubernetes helps companies run many software containers reliably, like managing many robots working together.

💼 Career

Understanding Kubernetes basics is essential for DevOps roles that manage cloud applications and infrastructure.

1

Create a basic Pod definition

Create a YAML file called pod.yaml with a Kubernetes Pod definition. The Pod should have apiVersion set to v1, kind set to Pod, and metadata with name set to my-first-pod. Under spec, add one container named nginx-container using the image nginx.

Kubernetes

# Your code here

Need a hint?

Start with the basic structure of a Pod YAML file. Use apiVersion, kind, metadata, and spec. Under spec, define one container with the nginx image.

2

Add a label to the Pod

Add a label called app with the value webserver under the metadata section in the pod.yaml file. This label helps identify the Pod.

Kubernetes

apiVersion: v1
kind: Pod
metadata:
  name: my-first-pod
  # Add the label app: webserver below
spec:
  containers:
  - name: nginx-container
    image: nginx

Need a hint?

Under metadata, add a labels section with app: webserver.

3

Explain the Pod's purpose

Write a comment at the top of the pod.yaml file explaining that this Pod runs an nginx web server container.

Kubernetes

# Your comment here
apiVersion: v1
kind: Pod
metadata:
  name: my-first-pod
  labels:
    app: webserver
spec:
  containers:
  - name: nginx-container
    image: nginx

Need a hint?

Start the file with a comment line beginning with # describing the Pod's purpose.

4

Display the Pod configuration

Print the contents of the pod.yaml file to show the complete Pod configuration.

Kubernetes

# Your code here

Need a hint?

Use Python's open and read functions to print the file contents.