Quiz: Docker

5 questionsNo time limitPass: 60%+10 XP on first pass

Package a Spring Boot app as a Docker image with a multi-stage Dockerfile, run as a non-root user, and start the whole microservices system — Kafka, Eureka, gateway and services — with one docker compose command.

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Question 1
What is the difference between an image and a container?
They are the same thingAn image is a template; a container is a running instance of itA container is stored in a registry; an image runsImages run only on Linux; containers on Windows
Question 2
Why use a multi-stage Dockerfile for a Spring Boot app?
Docker requires at least two stagesThe final image contains only the JRE and jar, not the JDK, Maven or source codeIt runs the tests twiceIt makes the jar file larger
Question 3
Inside Docker Compose, how does order-service reach Kafka?
localhost:9092kafka:9092 — the service nameThe host machine's IP addressIt can't; containers are isolated
Question 4
How does SPRING_KAFKA_BOOTSTRAP_SERVERS affect the app?
It is ignoredIt overrides the spring.kafka.bootstrap-servers propertyIt sets the Docker portIt changes the Java version
Question 5
Why copy pom.xml and download dependencies before copying src?
Maven needs it in that orderSo Docker can reuse the cached dependency layer when only code changesTo make the image run as rootSo tests are skipped

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