Use Docker to Build a Container Image of a Backstage Project CBA Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   After building a Backstage image, which command shows the layers and configuration of the image, helping you verify that the expected artifacts (e.g., the backend bundle) are present?

   • Adocker logs <image>
   • Bdocker ps <image>
   • Cdocker inspect <image>
   • Ddocker pull <image>
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2. 17foundation · easy

   Which docker command builds a container image from the Dockerfile in the current directory and tags it as 'my-backstage:latest'?

   • Adocker build my-backstage:latest .
   • Bdocker run -t my-backstage:latest .
   • Cdocker build -t my-backstage:latest .
   • Ddocker image build -tag my-backstage:latest .
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4. 18expert · hard

   A Backstage project has a build step that requires secrets (e.g., a private npm registry token) to install dependencies. The team wants to avoid leaving these secrets in the final image. What is the best practice for handling secrets during a multi-stage Docker build?

   • AEmbed the secret in the Dockerfile using ENV.
   • BPass the secret as a build argument using --build-arg.
   • CUse Docker BuildKit's --secret flag to mount the secret during the build step without copying it into the image.
   • DCopy the secret into the image during the build stage and delete it in the runtime stage.
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5. 19foundation · easy

   In a Dockerfile for a Backstage project, which instruction is used to copy the package.json and yarn.lock files into the image before running `yarn install`?

   • ACOPY package.json yarn.lock ./
   • BRUN yarn install
   • CENV NODE_ENV=production
   • DADD app-config.yaml ./
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6. 20foundation · easy

   What is the purpose of the `CMD` instruction in a Dockerfile for a Backstage project?

   • AIt sets environment variables for the runtime container.
   • BIt installs the project's dependencies during the image build.
   • CIt copies the built frontend bundle into the backend's static directory.
   • DIt specifies the command to run when the container starts, such as `node packages/backend`.
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