Pods and deployments for services in Microservices - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the number of replicas in a Kubernetes deployment.

Microservices

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-service
spec:
  replicas: [1]
  selector:
    matchLabels:
      app: my-service

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

A0

B5

C3

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Setting replicas to 0 stops all pods.

Using a string instead of a number.

The replicas field defines how many pod copies run. Setting it to 1 means one pod will run.

2fill in blank

medium

Complete the code to define the container image in the pod template.

Microservices

spec:
  template:
    metadata:
      labels:
        app: my-service
    spec:
      containers:
      - name: my-service-container
        image: [1]

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

Amy-service:1.0

Bnginx:latest

Cubuntu:20.04

Dredis:alpine

Attempts:

3 left

💡 Hint

Common Mistakes

Using a generic image like nginx instead of the service image.

Forgetting to specify the image tag.

The image field specifies the container image to run. Here, my-service:1.0 is the correct service image.

3fill in blank

hard

Fix the error in the deployment selector to correctly match the pod labels.

Microservices

spec:
  selector:
    matchLabels:
      app: [1]
  template:
    metadata:
      labels:
        app: my-service

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

Aapp-service

Bservice-app

Cmy-service

Dmyapp

Attempts:

3 left

💡 Hint

Common Mistakes

Using different label names in selector and pod template.

Typos in label values.

The selector must exactly match the pod template labels. Here, both use app: my-service.

4fill in blank

hard

Fill both blanks to define a service that exposes the deployment on port 80 and targets container port 8080.

Microservices

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

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

A80

B8080

C443

D3000

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping port and targetPort values.

Using a port not exposed by the container.

The service port is the external port (80), and targetPort is the container port (8080) the service forwards to.

5fill in blank

hard

Fill all three blanks to create a deployment with 3 replicas, using the image 'my-service:2.0', and label the pods with 'app: my-service'.

Microservices

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-service
spec:
  replicas: [1]
  selector:
    matchLabels:
      app: [2]
  template:
    metadata:
      labels:
        app: [3]
    spec:
      containers:
      - name: my-service-container
        image: my-service:2.0

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

A3

Bmy-service

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching selector and pod labels.

Setting replicas to 1 instead of 3.

The deployment needs 3 replicas, and the selector and pod labels must both be 'app: my-service' to match pods correctly.