Kubernetes & Orchestration Flashcards

What is a Kubernetes StatefulSet used for?

Answer: Managing stateful applications that require stable network identities and persistent storage

StatefulSets provide ordered deployment, stable persistent storage, and stable network identities for stateful applications like databases.

What is a Kubernetes resource 'limit' vs. 'request'?

Answer: Requests are the guaranteed minimum resources; limits are the maximum a container can use

Resource requests are used by the scheduler to place Pods on nodes with sufficient capacity; limits cap the maximum resources a container can consume.

What is a Kubernetes Liveness Probe?

Answer: A periodic check that restarts a container if it fails, indicating the app is unhealthy

A liveness probe periodically checks if a container is running correctly and restarts it if the probe fails, recovering from deadlocks or corrupted state.

What is Helm in the Kubernetes ecosystem?

Answer: A package manager for Kubernetes that installs applications using charts

Helm is the Kubernetes package manager that uses charts (templated YAML manifests) to define, install, and upgrade complex Kubernetes applications.

What does a Kubernetes NetworkPolicy do?

Answer: Controls which Pods can communicate with each other and with external endpoints

NetworkPolicies define firewall rules at the Pod level, specifying which ingress and egress traffic is allowed based on Pod labels and namespaces.

What is the purpose of Kubernetes RBAC (Role-Based Access Control)?

Answer: Controlling who can perform what actions on which Kubernetes resources

RBAC grants fine-grained access control to Kubernetes API resources by assigning Roles (permissions) to users, groups, or service accounts via RoleBindings.