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 the primary purpose of a Docker container?
Answer: To package an application with its dependencies into an isolated runtime environment
A Docker container bundles application code, runtime, libraries, and configuration so it runs consistently across different environments.
What is a Kubernetes Pod?
Answer: The smallest deployable unit in Kubernetes, containing one or more containers
A Pod is the smallest unit in Kubernetes, wrapping one or more tightly coupled containers that share network and storage.
What does a Kubernetes Deployment object manage?
Answer: The desired state and rolling updates of a set of Pods
A Deployment declaratively manages a ReplicaSet, ensuring the specified number of Pod replicas run and enabling rolling updates and rollbacks.
What is the role of etcd in a Kubernetes cluster?
Answer: The distributed key-value store that holds all cluster state and configuration
etcd is the backing store for all Kubernetes cluster data, including desired and actual state of all objects.
What does the `kubectl apply` command do?
Answer: Creates or updates Kubernetes resources defined in a YAML/JSON manifest
`kubectl apply` uses declarative configuration to create or update resources, only changing what differs from the current state.
What is a Kubernetes Service?
Answer: A stable network endpoint that routes traffic to a set of Pods
A Service provides a stable virtual IP and DNS name for a set of Pods, enabling reliable discovery and load balancing.