Pods and deployments for services in Microservices - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Pod in Kubernetes?

A Pod is the smallest deployable unit in Kubernetes. It represents one or more containers that share storage, network, and a specification for how to run the containers.

beginner

What is the purpose of a Deployment in Kubernetes?

A Deployment manages Pods and ReplicaSets. It ensures the desired number of Pods are running, handles updates, and can roll back changes if needed.

intermediate

How do Deployments help with scaling services?

Deployments allow you to easily increase or decrease the number of Pod replicas, enabling your service to handle more or less traffic as needed.

intermediate

Why should containers in a Pod share the same network namespace?

Sharing the network namespace allows containers in a Pod to communicate with each other using localhost, making coordination simpler and faster.

beginner

What happens if a Pod crashes in a Deployment?

The Deployment controller detects the crash and automatically creates a new Pod to replace the failed one, keeping the service running smoothly.

What is the smallest deployable unit in Kubernetes?

A Node

B Deployment

C Service

D Pod

A Pod is the smallest deployable unit that can contain one or more containers.

Which Kubernetes object manages rolling updates for Pods?

A ConfigMap

B Service

C Deployment

D Namespace

Deployments handle rolling updates and rollbacks for Pods.

How do containers inside the same Pod communicate?

A Through separate IP addresses

B Using localhost network

C Via external service

D They cannot communicate

Containers in the same Pod share the network namespace and communicate via localhost.

What ensures the desired number of Pod replicas are running?

A Deployment

B ReplicaSet

C Pod

D Ingress

Deployments manage ReplicaSets to maintain the desired number of Pods.

If a Pod crashes, what does the Deployment do?

A Creates a new Pod to replace it

B Deletes the Deployment

C Does nothing

D Scales down the service

The Deployment controller replaces crashed Pods automatically.

Explain how Pods and Deployments work together to keep a microservice running smoothly.

Think about how Kubernetes keeps your app available and updated.

Describe the benefits of using Deployments for scaling microservices.

Consider how you handle more users or traffic.