Containerization & Kubernetes Flashcards
6 cards from real DevOps practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Containerization & Kubernetes flashcards as text
What is a ConfigMap in Kubernetes?
Answer: An object for storing non-sensitive configuration data as key-value pairs
ConfigMaps decouple configuration from container images, letting you inject environment variables or config files into Pods at runtime.
What is the difference between a StatefulSet and a Deployment in Kubernetes?
Answer: StatefulSets maintain stable Pod identities and ordered scaling, while Deployments treat Pods as interchangeable
StatefulSets are designed for stateful applications that need stable hostnames, persistent storage, and ordered Pod lifecycle management.
What does a Kubernetes Ingress resource do?
Answer: Routes external HTTP/HTTPS traffic to internal Services based on rules
An Ingress exposes HTTP and HTTPS routes from outside the cluster, routing traffic to Services based on hostname and path rules.
What is a DaemonSet in Kubernetes?
Answer: Ensures a copy of a Pod runs on every (or selected) node in the cluster
DaemonSets are used for node-level agents like log collectors, monitoring agents, or CNI plugins that must run on every node.
What is the function of the Kubernetes Horizontal Pod Autoscaler (HPA)?
Answer: Automatically scales the number of Pod replicas based on CPU/memory metrics
HPA monitors metrics and adjusts the replica count of a Deployment or StatefulSet to match current demand automatically.
What is a multi-stage Docker build used for?
Answer: Reducing the final image size by discarding build tools in intermediate stages
Multi-stage builds use multiple FROM instructions; only the final stage is shipped, leaving behind compilers and test tools that bloat the image.