Why ReplicaSets ensure availability in Kubernetes - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the number of pod replicas in a ReplicaSet.

Kubernetes

replicas: [1]

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

A5

B3

C1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Setting replicas to 0 stops all pods.

Using a string instead of a number.

The replicas field sets how many pod copies the ReplicaSet should maintain. Setting it to 5 means 5 pods will run to ensure availability.

2fill in blank

medium

Complete the selector to match pods with label app: nginx.

Kubernetes

selector:
  matchLabels:
    app: [1]

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

Amysql

Bredis

Cnginx

Dapache

Attempts:

3 left

💡 Hint

Common Mistakes

Using a label that does not match any pod.

Typos in label values.

The selector must match the pod label app: nginx so the ReplicaSet manages the correct pods.

3fill in blank

hard

Fix the error in the pod template labels to ensure they match the selector.

Kubernetes

template:
  metadata:
    labels:
      app: [1]

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

Amysql

Bapache

Credis

Dnginx

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatch between selector and template labels.

Using different app names.

The pod template labels must match the selector labels exactly. Here, app: nginx ensures the ReplicaSet manages these pods.

4fill in blank

hard

Fill both blanks to complete the ReplicaSet spec that ensures 4 nginx pods.

Kubernetes

replicas: [1]
selector:
  matchLabels:
    app: [2]

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

A4

B3

Cnginx

Dapache

Attempts:

3 left

💡 Hint

Common Mistakes

Wrong number of replicas.

Selector label mismatch.

Setting replicas to 4 and selector app: nginx ensures 4 nginx pods run for availability.

5fill in blank

hard

Fill all three blanks to complete the pod template spec inside the ReplicaSet.

Kubernetes

template:
  metadata:
    labels:
      app: [1]
  spec:
    containers:
    - name: [2]
      image: [3]

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

Anginx

Bweb-server

Cnginx:latest

Dapache

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatch between labels and container image.

Using wrong container names.

The pod template labels and container name should be consistent. Using app: nginx, container name web-server, and image nginx:latest ensures the ReplicaSet runs the correct pods.