Creating Deployments with YAML in Kubernetes - Quick Revision & Summary

Recall & Review

beginner

What is a Deployment in Kubernetes?

A Deployment in Kubernetes manages a set of identical pods. It ensures the desired number of pods are running and updates them smoothly when changes happen.

beginner

Which YAML field specifies the number of pod replicas in a Deployment?

The spec.replicas field sets how many pod copies Kubernetes should run.

intermediate

What does the selector field do in a Deployment YAML?

The selector tells Kubernetes which pods belong to this Deployment by matching labels.

intermediate

Why is the template section important in a Deployment YAML?

The template defines the pod's configuration, like containers and labels, that the Deployment will create.

intermediate

How do you update a Deployment to use a new container image?

Change the spec.template.spec.containers[].image field to the new image version and apply the YAML. Kubernetes will update pods smoothly.

Which field in a Deployment YAML specifies the pod labels to match?

A spec.replicas

B metadata.labels

C spec.template.spec.containers

D spec.selector.matchLabels

The spec.selector.matchLabels field defines which pods belong to the Deployment by matching their labels.

What happens if you set spec.replicas to 3?

A Kubernetes ignores the setting

B Kubernetes runs 3 copies of the pod

C Kubernetes runs 1 pod only

D Kubernetes deletes all pods

Setting spec.replicas to 3 tells Kubernetes to keep 3 pod copies running.

Where do you specify the container image in a Deployment YAML?

A spec.selector

B metadata.name

C spec.template.spec.containers[].image

D spec.replicas

The container image is set inside spec.template.spec.containers[].image.

What is the purpose of the metadata.name field in a Deployment YAML?

A It names the Deployment resource

B It sets the container image

C It defines pod labels

D It specifies the number of replicas

metadata.name gives the Deployment a unique name in the cluster.

How does Kubernetes update pods when you change the container image in a Deployment?

A It creates new pods with the new image and deletes old ones gradually

B It deletes all pods immediately

C It ignores the change

D It restarts the cluster

Kubernetes performs a rolling update by creating new pods with the new image and removing old pods smoothly.

Explain the key sections of a Kubernetes Deployment YAML and their roles.

Think about how Kubernetes knows what pods to run and how many.

Describe how you would update a Deployment to use a new version of a container image.

Focus on the image field and what happens after applying changes.