Desired state vs actual state reconciliation in Kubernetes - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the desired number of replicas in a Kubernetes Deployment manifest.

Kubernetes

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

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A5

B3

C0

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Setting replicas to 0 will stop all pods.

Using a string instead of a number.

The replicas field defines the desired number of pod copies. Setting it to 5 means Kubernetes will try to keep 5 pods running.

2fill in blank

medium

Complete the command to check the actual state of pods in the default namespace.

Kubernetes

kubectl get [1]

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Apods

Bservices

Cdeployments

Dnodes

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'services' or 'deployments' shows different resources, not pods.

The kubectl get pods command lists all pods, showing the actual running state.

3fill in blank

hard

Fix the error in the command to apply a manifest file named deployment.yaml.

Kubernetes

kubectl [1] -f deployment.yaml

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Aget

Bapply

Cdelete

Ddescribe

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'delete' removes resources instead of applying changes.

Using 'get' or 'describe' only shows info, no changes.

The kubectl apply -f command applies changes from a manifest file to the cluster, updating the desired state.

4fill in blank

hard

Fill both blanks to create a label selector that matches pods with label app=web and environment=prod.

Kubernetes

kubectl get pods -l [1]=[2]

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Aapp

Bweb

Cenvironment

Dprod

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping key and value positions.

Using incorrect label keys or values.

The label selector app=web filters pods with label key 'app' and value 'web'.

Note: This task only fills one label selector; to filter both labels, you would combine selectors with commas.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps pod names to their status phase if the phase is Running.

Kubernetes

pod_status = {pod.metadata.name: pod.status.[1] for pod in pods if pod.status.[2] == '[3]'}

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Aphase

CRunning

DReady

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Ready' instead of 'Running' as the phase filter.

Using incorrect attribute names.

This comprehension creates a dictionary of pod names to their phase, but only includes pods where the phase is 'Running'.