What is Kubernetes - Interactive Quiz & Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a Kubernetes pod manifest with a single container.

Kubernetes

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
  - name: my-container
    image: [1]

Drag options to blanks, or click blank then click option'

Anginx

Bdocker

Ckubectl

Dpodman

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'docker' or 'kubectl' as image names, which are tools not images.

The image field specifies the container image to run inside the pod. 'nginx' is a valid container image name.

2fill in blank

medium

Complete the command to list all pods in the default namespace.

Kubernetes

kubectl [1] pods

Drag options to blanks, or click blank then click option'

Aget

Bcreate

Cdelete

Dapply

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'create' or 'delete' which modify resources instead of listing them.

The kubectl get pods command lists all pods in the current namespace.

3fill in blank

hard

Fix the error in the command to apply a configuration file named pod.yaml.

Kubernetes

kubectl [1] -f pod.yaml

Drag options to blanks, or click blank then click option'

Adelete

Bget

Capply

Ddescribe

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'get' or 'describe' which only show information, not apply changes.

The kubectl apply -f command applies changes from a configuration file to the cluster.

4fill in blank

hard

Fill both blanks to create a service that exposes pods on port 80.

Kubernetes

apiVersion: v1
kind: Service
metadata:
  name: my-service
spec:
  selector:
    app: [1]
  ports:
  - protocol: TCP
    port: [2]

Drag options to blanks, or click blank then click option'

Awebapp

Bdatabase

C80

D443

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong labels or ports like 443 which is for HTTPS.

The selector matches pods labeled 'app: webapp'. The port 80 exposes the service on HTTP default port.

5fill in blank

hard

Fill all three blanks to create a deployment with 3 replicas of nginx pods.

Kubernetes

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: [1]
  selector:
    matchLabels:
      app: [2]
  template:
    metadata:
      labels:
        app: [3]
    spec:
      containers:
      - name: nginx
        image: nginx

Drag options to blanks, or click blank then click option'

A3

Bnginx-app

Cnginx

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching labels or wrong replica count.

The deployment runs 3 replicas. The label app: nginx is used consistently to match pods and selector.

Practice

1. What is the main purpose of Kubernetes?

easy

A. To design websites with HTML and CSS

B. To manage and run many copies of programs across multiple computers

C. To write code for mobile applications

D. To create databases for storing data

Solution

1. Step 1: Understand Kubernetes role

   Kubernetes is a tool that helps run many copies of programs on many computers.

2. Step 2: Compare options

   Only To manage and run many copies of programs across multiple computers describes managing programs across computers, which matches Kubernetes' purpose.

3. Final Answer:

   To manage and run many copies of programs across multiple computers -> Option B

4. Quick Check:

   Kubernetes = Manage many program copies [OK]

Hint: Kubernetes manages many program copies on many computers [OK]

Common Mistakes:

• Confusing Kubernetes with programming languages
• Thinking Kubernetes is for website design
• Mixing Kubernetes with database creation

2. Which command is used to interact with Kubernetes from the command line?

easy

A. kubectl

B. docker

C. git

D. npm

Solution

1. Step 1: Identify Kubernetes command-line tool

   The tool to control Kubernetes is called kubectl.

2. Step 2: Check other options

   Docker manages containers, git manages code versions, npm manages JavaScript packages, so they are not correct.

3. Final Answer:

   kubectl -> Option A

4. Quick Check:

   Kubernetes CLI = kubectl [OK]

Hint: Use kubectl to control Kubernetes from terminal [OK]

Common Mistakes:

• Using docker instead of kubectl for Kubernetes
• Confusing git with Kubernetes commands
• Thinking npm controls Kubernetes

3. What happens if a program managed by Kubernetes crashes on one computer?

medium

A. Kubernetes deletes all copies of the program

B. The program stays crashed and Kubernetes does nothing

C. Kubernetes automatically restarts the program on the same or another computer

D. You must manually restart the program yourself

Solution

1. Step 1: Understand Kubernetes fault handling

   Kubernetes watches programs and restarts them automatically if they crash.

2. Step 2: Evaluate options

   Only Kubernetes automatically restarts the program on the same or another computer describes automatic restart, which matches Kubernetes behavior.

3. Final Answer:

   Kubernetes automatically restarts the program on the same or another computer -> Option C

4. Quick Check:

   Kubernetes auto-restarts crashed programs [OK]

Hint: Kubernetes auto-restarts crashed programs [OK]

Common Mistakes:

• Thinking Kubernetes ignores crashed programs
• Believing Kubernetes deletes programs on crash
• Assuming manual restart is always needed

4. You run kubectl get pods but get an error saying "connection refused". What is the likely problem?

medium

A. Kubernetes cluster is not running or unreachable

B. The kubectl command is misspelled

C. Your computer has no internet connection

D. You typed the wrong pod name

Solution

1. Step 1: Analyze error message

   "Connection refused" means kubectl cannot reach the Kubernetes cluster.

2. Step 2: Check options

   Misspelling would cause command not found, no internet is unrelated if cluster is local, wrong pod name gives different error.

3. Final Answer:

   Kubernetes cluster is not running or unreachable -> Option A

4. Quick Check:

   Connection refused = cluster unreachable [OK]

Hint: Connection refused means cluster is down or unreachable [OK]

Common Mistakes:

• Assuming internet is required for local cluster
• Thinking typo causes connection refused
• Confusing pod name errors with connection errors

5. You want to keep a program running with 3 copies at all times using Kubernetes. Which Kubernetes object should you create?

hard

A. Namespace

B. Service

C. ConfigMap

D. Deployment

Solution

1. Step 1: Identify object for managing program copies

   A Deployment manages multiple copies (replicas) of a program and keeps them running.

2. Step 2: Review other objects

   Service exposes programs to network, ConfigMap stores config data, Namespace groups resources, none manage replicas.

3. Final Answer:

   Deployment -> Option D

4. Quick Check:

   Multiple copies managed by Deployment [OK]

Hint: Use Deployment to keep multiple program copies running [OK]

Common Mistakes:

• Confusing Service with Deployment
• Using ConfigMap to manage replicas
• Thinking Namespace controls program copies