Scaling Deployments in Kubernetes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of scaling a deployment in Kubernetes?

Scaling a deployment adjusts the number of pod replicas to handle more or less workload, ensuring the application can meet demand efficiently.

beginner

Which command scales a deployment named 'webapp' to 5 replicas?

kubectl scale deployment webapp --replicas=5

intermediate

What is the difference between manual and automatic scaling in Kubernetes?

Manual scaling requires you to specify the number of replicas yourself. Automatic scaling uses metrics like CPU usage to adjust replicas automatically.

intermediate

What Kubernetes resource is used for automatic scaling of deployments?

The Horizontal Pod Autoscaler (HPA) automatically adjusts the number of pod replicas based on observed metrics like CPU or memory usage.

beginner

How do you check the current number of replicas for a deployment named 'api-server'?

Use the command: kubectl get deployment api-server to see the current replicas and status.

Which command scales a deployment named 'frontend' to 3 replicas?

A kubectl set replicas frontend 3

B kubectl scale deployment frontend --replicas=3

C kubectl deploy scale frontend 3

D kubectl update deployment frontend replicas=3

The correct syntax to scale a deployment is 'kubectl scale deployment --replicas='.

What does the Horizontal Pod Autoscaler (HPA) use to decide when to scale pods?

A Number of nodes in the cluster

B User manual input

C Metrics like CPU or memory usage

D Pod restart count

HPA automatically scales pods based on resource usage metrics such as CPU or memory.

If you want to reduce the number of replicas from 10 to 4 manually, which command would you use?

A kubectl set replicas myapp 4

B kubectl reduce deployment myapp 4

C kubectl update deployment myapp replicas=4

D kubectl scale deployment myapp --replicas=4

Scaling is done with 'kubectl scale deployment --replicas='.

How can you view the current number of replicas and their status for a deployment?

A kubectl get deployment <deployment-name>

B kubectl scale deployment

C kubectl logs deployment

D kubectl describe pods

'kubectl get deployment ' shows the number of replicas and their current status.

Which of the following is NOT a benefit of scaling deployments?

A Automatically fixing code bugs

B Reducing resource waste

C Handling increased traffic

D Improving application availability

Scaling helps with traffic and resource management but does not fix code bugs automatically.

Explain how you would manually scale a Kubernetes deployment and why you might want to do this.

Think about adjusting the number of pods to match demand.

Describe what the Horizontal Pod Autoscaler does and how it helps manage deployments.

Consider how Kubernetes can watch resource use and change pod count.