Use Docker to Build a Container Image of a Backstage Project CBA Practice Questions (Page 3)

Questions 11–15

1. 11application · easy

   A developer is explaining Docker to a colleague who is new to containerization. The colleague asks why Docker is useful for deploying a Backstage application. Which response best describes the primary benefit?

   • ADocker automatically scales the Backstage application based on traffic.
   • BDocker compiles the Backstage code into a single binary file.
   • CDocker ensures the application runs consistently across different environments by packaging the application and its dependencies together.
   • DDocker eliminates the need for a package manager like yarn or npm.
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2. 12foundation · easy

   Which file is commonly used in a Docker image to provide environment-specific configuration for Backstage without changing the main app-config.yaml?

   • ADockerfile
   • Bapp-config.production.yaml
   • Cpackage.json
   • Dyarn.lock
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4. 13expert · hard

   A Backstage project has a large number of dependencies, and the Docker build is slow because the dependency installation step runs every time the source code changes. The team wants to improve build performance while keeping the multi-stage structure. What is the best practice to achieve this?

   • AUse a single-stage build to avoid the overhead of multiple stages.
   • BCopy the entire source code before running the dependency installation.
   • CRun the dependency installation on the host and copy the node_modules directory into the image.
   • DCopy the package.json and yarn.lock files first, run the dependency installation, and then copy the rest of the source code.
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5. 14application · medium

   A Backstage application uses a configuration value that is the same across all environments. The team wants to include this value in the image without exposing it as a build argument. What is the best approach?

   • ASet the value as an environment variable in the Dockerfile using ENV.
   • BSet the value directly in app-config.yaml and copy the file into the image.
   • CUse a Docker build argument and reference it in the Dockerfile.
   • DPass the value via docker run --env every time the container starts.
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6. 15foundation · easy

   When using Docker to containerize a Backstage project, what is the purpose of a Dockerfile?

   • AIt provides a snapshot of the container's file system at runtime, allowing you to inspect the running container.
   • BIt lists the Node.js packages required by the Backstage project, similar to a package.json file.
   • CIt stores the runtime configuration for the Backstage application, such as database connections and authentication.
   • DIt defines the base image, dependencies, and commands needed to build a Docker image for the project.
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