Horizontal Pod Autoscaler in Kubernetes - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to create a Horizontal Pod Autoscaler for deployment 'webapp' targeting CPU usage at 50%.

Kubernetes

kubectl autoscale deployment webapp --cpu-percent=[1] --min=1 --max=5

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

A50

B80

C30

D100

Attempts:

3 left

💡 Hint

Common Mistakes

Using too high or too low CPU percent causing no scaling or too frequent scaling.

The --cpu-percent flag sets the target average CPU utilization for the pods. 50% is a common target.

2fill in blank

medium

Complete the YAML snippet to specify the minimum number of replicas as 2 in the Horizontal Pod Autoscaler spec.

Kubernetes

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: example-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: example
  minReplicas: [1]
  maxReplicas: 10
  metrics:
  - type: Resource

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

A1

B2

C3

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Setting minReplicas to 0 which can cause downtime.

The minReplicas field sets the minimum number of pod replicas the autoscaler maintains.

3fill in blank

hard

Fix the error in the metric type to correctly specify CPU resource metric in the HPA spec.

Kubernetes

metrics:
- type: [1]
  resource:
    name: cpu
    target:
      type: Utilization
      averageUtilization: 60

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AExternal

BPods

CResource

DObject

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Pods' or 'External' which are invalid for CPU resource metrics.

The metric type for CPU usage is Resource. Other types are for different metric sources.

4fill in blank

hard

Fill both blanks to complete the command that describes the Horizontal Pod Autoscaler named 'frontend-hpa' in namespace 'prod'.

Kubernetes

kubectl [1] hpa frontend-hpa -n [2]

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Adescribe

Bprod

Cdelete

Dcreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'get' which shows summary, or wrong namespace.

The describe command shows detailed info about the HPA. The namespace is specified with -n.

5fill in blank

hard

Fill all three blanks to complete the YAML snippet for HPA targeting deployment 'api-server' with min 2, max 6 replicas, and CPU utilization target 70%.

Kubernetes

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: [1]
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: [2]
  minReplicas: [3]
  maxReplicas: 6
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 70

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

Aapi-server-hpa

Bapi-server

C2

Dfrontend

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing deployment and HPA names or wrong minReplicas value.

The metadata.name is the HPA name, scaleTargetRef.name is the deployment name, and minReplicas sets the minimum pods.