ReplicaSet definition in Kubernetes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a ReplicaSet in Kubernetes?

A ReplicaSet is a Kubernetes object that ensures a specified number of pod replicas are running at any given time. It helps keep the application available by replacing pods that fail or are deleted.

beginner

How does a ReplicaSet know which pods to manage?

A ReplicaSet uses a label selector to identify the pods it manages. It matches pods with specific labels and ensures the desired number of those pods are running.

beginner

What happens if a pod managed by a ReplicaSet crashes or is deleted?

The ReplicaSet detects the missing pod and creates a new pod to maintain the desired number of replicas, ensuring the application stays available.

beginner

Which field in a ReplicaSet YAML defines the number of pod replicas?

The 'replicas' field in the ReplicaSet YAML specifies how many pod copies should be running.

intermediate

Can a ReplicaSet manage pods created by a Deployment?

Yes, Deployments use ReplicaSets internally to manage pod replicas. Users usually interact with Deployments, which handle ReplicaSets automatically.

What is the main purpose of a ReplicaSet in Kubernetes?

A To ensure a specified number of pod replicas are running

B To store container images

C To manage network policies

D To schedule pods on nodes

A ReplicaSet's main job is to keep the desired number of pod replicas running.

How does a ReplicaSet select which pods to manage?

A By pod IP addresses

B By pod creation time

C By matching pod labels with its selector

D By pod resource usage

ReplicaSets use label selectors to identify pods they manage.

If a pod managed by a ReplicaSet is deleted, what happens next?

A The ReplicaSet scales down

B Nothing happens

C The ReplicaSet deletes all pods

D ReplicaSet creates a new pod to replace it

ReplicaSet ensures the desired number of pods by creating replacements if pods are deleted.

Which YAML field defines how many pods a ReplicaSet should maintain?

A template

B replicas

C selector

D metadata

The 'replicas' field sets the number of pod copies to run.

What Kubernetes object typically manages ReplicaSets for you?

A Deployment

B Service

C ConfigMap

D Ingress

Deployments create and manage ReplicaSets automatically.

Explain what a ReplicaSet is and why it is important in Kubernetes.

Think about how Kubernetes keeps your app running smoothly.

Describe how a ReplicaSet reacts when one of its pods fails or is deleted.

Consider what happens behind the scenes to keep your app stable.