Pod priority and preemption in Kubernetes - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the priority class name for a pod.

Kubernetes

apiVersion: v1
kind: Pod
metadata:
  name: example-pod
spec:
  priorityClassName: [1]
  containers:
  - name: nginx
    image: nginx

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

Ahigh-priority

Blow-priority

Cmedium-priority

Dno-priority

Attempts:

3 left

💡 Hint

Common Mistakes

Using a priority class name that does not exist in the cluster.

The priorityClassName field assigns the pod's priority. "medium-priority" is a common default priority class.

2fill in blank

medium

Complete the command to create a priority class with high priority.

Kubernetes

kubectl create priorityclass [1] --value=1000 --description="High priority class"

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

Amedium-priority

Blow-priority

Cdefault-priority

Dhigh-priority

Attempts:

3 left

💡 Hint

Common Mistakes

Using a priority class name that does not match the value.

The command creates a priority class named "high-priority" with a high value of 1000.

3fill in blank

hard

Fix the error in the pod spec to enable preemption by setting the correct field.

Kubernetes

apiVersion: v1
kind: Pod
metadata:
  name: preemptible-pod
spec:
  priorityClassName: high-priority
  [1]: "PreemptLowerPriority"
  containers:
  - name: busybox
    image: busybox
    command: ["sleep", "3600"]

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

AenablePreemption

BpreemptionPolicy

Cpreemptible

DallowPreemption

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent fields like 'enablePreemption' or 'allowPreemption'.

The correct field to control preemption behavior is preemptionPolicy. Setting it to "PreemptLowerPriority" enables preemption.

4fill in blank

hard

Fill both blanks to create a priority class YAML with correct apiVersion and kind.

Kubernetes

apiVersion: [1]
kind: [2]
metadata:
  name: custom-priority
value: 500
globalDefault: false
description: "Custom priority class"

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

Ascheduling.k8s.io/v1

Bv1

CPriorityClass

DPodPriority

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'v1' as apiVersion or 'PodPriority' as kind.

The apiVersion for priority classes is 'scheduling.k8s.io/v1' and the kind is 'PriorityClass'.

5fill in blank

hard

Fill in the blanks to write a pod spec that uses a priority class and disables preemption.

Kubernetes

apiVersion: v1
kind: Pod
metadata:
  name: no-preempt-pod
spec:
  priorityClassName: [1]
  preemptionPolicy: [2]
  containers:
  - name: app
    image: nginx
    command: ["nginx", "-g", "daemon off;"]

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

Ahigh-priority

BNever

Creplicas

Dpriority

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'replicas' in pod spec (only for deployments).

Setting preemptionPolicy to wrong values.

The pod uses the 'high-priority' class, sets preemptionPolicy to 'Never' to disable preemption.