Kubernetes Architecture & Components Flashcards

Which resource type allows a Kubernetes administrator to define a template for creating multiple identical Pods across nodes?

Answer: DaemonSet

A DaemonSet ensures that one copy of a Pod runs on all (or selected) nodes, making it ideal for node-level agents like log collectors.

What is the purpose of a Kubernetes Namespace?

Answer: To provide a virtual cluster within a physical cluster for resource and scope isolation

Namespaces provide a scope for names and allow logical partitioning of cluster resources between multiple users or teams.

Which field in a Pod spec determines how kubelet handles a container that crashes?

Answer: restartPolicy

The restartPolicy field (Always, OnFailure, or Never) controls whether and how kubelet restarts containers that exit.

What happens to a Pod's IP address when the Pod is deleted and recreated by a ReplicaSet?

Answer: A new IP address is assigned from the cluster's Pod CIDR

Pods are ephemeral; when a Pod is deleted and a new one is created, the new Pod receives a fresh IP address from the cluster's Pod network CIDR.

Which Kubernetes object stores sensitive configuration data such as passwords and API keys?

Answer: Secret

Secrets store sensitive data in base64-encoded form and can be mounted as volumes or exposed as environment variables, with tighter access controls than ConfigMaps.

What is the relationship between a ReplicaSet and a Deployment in Kubernetes?

Answer: A Deployment manages one or more ReplicaSets to enable rolling updates and rollbacks

A Deployment creates and owns ReplicaSets, creating a new ReplicaSet during updates and scaling down the old one to enable declarative rolling updates.

Which component provides DNS resolution for Services and Pods within a Kubernetes cluster?

Answer: CoreDNS

CoreDNS runs as a cluster add-on and provides DNS-based service discovery, resolving Service names to ClusterIP addresses.