In a multi-stage Docker build for Backstage, which Docker instruction is used to copy the compiled backend from the build stage into the runtime stage?

EXPOSE --from=build /app/packages/backend

COPY --from=build /app/packages/backend ./packages/backend

ADD --from=build /app/packages/backend ./packages/backend

RUN cp /app/packages/backend ./packages/backend

What is the purpose of the build context in a `docker build` command?

It determines the base image to use for the build.

It sets the environment variables available during the build.

It specifies the directory containing the files that Docker can access during the build, such as the Dockerfile and source code.

It defines the target platform (e.g., linux/amd64) for the built image.

A Backstage project has a frontend that is built as static files and a backend that is built as a Node.js bundle. The team is using a multi-stage Docker build. The runtime stage needs to serve the frontend static files and run the backend. What is the most appropriate runtime setup?

Use a single runtime stage that copies both the frontend static files and the backend bundle, then starts the backend which serves the frontend.

Use a runtime stage that only copies the frontend static files and starts a static file server.

Use a runtime stage that only copies the backend bundle and starts the backend without the frontend.

Use two separate runtime stages: one for the frontend served by nginx and one for the backend.

Certified Backstage Associate (CBA)

Domain 1Objective 5

Use Docker to Build a Container Image of a Backstage Project CBA Practice Questions (Page 5)

Part of the Backstage Development Workflow domain, which accounts for 24% of the CBA exam. Linux Foundation does not publish an official question count, but from its 90-minute exam (~35–60 total, ~8–14 in this domain), expect 2–3 from this objective — we provide 24 practice questions to prepare you well beyond it. (estimate)

24questions here

5free pages

7concepts

24%of the exam

Questions 21–24

21foundation · easy
In a multi-stage Docker build for Backstage, which Docker instruction is used to copy the compiled backend from the build stage into the runtime stage?
Select an answer first
22foundation · easy
What is the purpose of the build context in a `docker build` command?
Select an answer first
23expert · hard
A Backstage project has a frontend that is built as static files and a backend that is built as a Node.js bundle. The team is using a multi-stage Docker build. The runtime stage needs to serve the frontend static files and run the backend. What is the most appropriate runtime setup?
Select an answer first
24foundation · easy
During a Docker build of a Backstage project, which file is used by the application at runtime to read configuration such as the backend base URL and database connection settings?
Select an answer first

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Use Docker to Build a Container Image of a Backstage Project CBA Practice Questions (Page 5)

Questions 21–24

In a multi-stage Docker build for Backstage, which Docker instruction is used to copy the compiled backend from the build stage into the runtime stage?

What is the purpose of the build context in a `docker build` command?

A Backstage project has a frontend that is built as static files and a backend that is built as a Node.js bundle. The team is using a multi-stage Docker build. The runtime stage needs to serve the frontend static files and run the backend. What is the most appropriate runtime setup?

During a Docker build of a Backstage project, which file is used by the application at runtime to read configuration such as the backend base URL and database connection settings?

Keep studying — Backstage Development Workflow