Use Docker to Build a Container Image of a Backstage Project CBA Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   In the context of containerizing a Backstage project, what is the primary role of a Docker image?

   • AA file that contains instructions for building a Docker image, such as base image, dependencies, and commands.
   • BA lightweight, standalone, executable package that includes everything needed to run a piece of software, such as code, runtime, libraries, and settings.
   • CA virtual machine that includes a full operating system and all necessary applications, providing strong isolation from the host.
   • DA running instance of an application that is isolated from the host operating system but shares the host's kernel.
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2. 7foundation · easy

   What is the main benefit of using a multi-stage Docker build for a Backstage project?

   • AIt separates the build environment from the runtime environment, resulting in a smaller and more secure final image.
   • BIt automatically deploys the image to a container registry after building.
   • CIt enables the container to run on both Linux and Windows hosts without modification.
   • DIt allows multiple developers to build the image simultaneously.
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4. 8application · medium

   A team is containerizing a Backstage application that must read a database connection string at runtime. The connection string differs between staging and production environments. The team wants to avoid rebuilding the image for each environment. What is the recommended approach?

   • AHardcode the production connection string in app-config.yaml before building the image.
   • BCreate a separate Dockerfile for each environment with the connection string baked into the image.
   • CStore the connection string in a file that is copied into the image during the build stage.
   • DUse an environment variable placeholder in app-config.yaml and pass the value via the docker run --env flag or an orchestrator secret.
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5. 9application · medium

   After building a Backstage image, a developer wants to verify that the compiled backend bundle and the production node_modules are present in the image. Which command should the developer use?

   • Adocker build --check <image>
   • Bdocker run --rm <image> ls /app/packages/backend/dist
   • Cdocker pull <image>
   • Ddocker inspect <image> --format '{{.Config.Cmd}}'
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6. 10application · medium

   A developer is creating a Dockerfile for a Backstage project and needs to ensure that the frontend and backend are both built. The project uses yarn workspaces. Which files must be present in the build context for the dependency installation step to succeed?

   • Apackage.json and yarn.lock only
   • Bapp-config.yaml and package.json only
   • Cyarn.lock and the backstage.json file only
   • Dpackage.json, yarn.lock, and the packages directory containing all workspace packages
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