Describe the Tenets of the "12-Factor App" 350-901 Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A developer is writing a Go web service that currently relies on an external Nginx server to proxy requests to the application. The team wants to deploy the service to a container platform that expects each container to be self-contained and expose its own HTTP port. What is the 12-factor compliant way to handle HTTP serving?

   • AEmbed an HTTP server in the Go application that listens on a port defined by the `PORT` environment variable.
   • BUse a Unix domain socket for the Go application and have Nginx connect to it.
   • CCompile the Go application as a CGI script and let the container's web server execute it.
   • DKeep Nginx as a separate container and configure it to proxy to the Go application container.
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2. 12application · medium

   An application is deployed as a single large process on a powerful server. The team expects traffic to increase significantly and wants to scale out. The application is stateless and stores all data in a managed database. What is the most 12-factor-aligned scaling strategy?

   • ASplit the application into multiple different processes, each handling a specific type of request.
   • BUse a thread pool within the single process to handle more concurrent requests.
   • CRun multiple instances of the same process behind a load balancer, each handling a share of the requests.
   • DIncrease the CPU and memory of the existing server to handle the higher load.
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4. 13application · medium

   A startup has a production environment running on Linux containers in a cloud platform. Developers use macOS laptops and run the application directly on the host, using a local SQLite database. A bug appears in production but cannot be reproduced locally. The team wants to reduce the gap between dev and prod. What is the most effective 12-factor-aligned change?

   • AHave developers run the application in the same container environment as production, using the same base image and a production-like database.
   • BAsk developers to test only on a staging server that mirrors production, keeping local development as-is for speed.
   • CDocument the differences between dev and prod in a wiki so developers can mentally account for them.
   • DUse a different programming language in development that is easier to debug, then rewrite for production.
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5. 14expert · hard

   An application is deployed across multiple regions for low latency. Each region has its own database and cache. The team currently stores the region-specific database URLs and cache endpoints in a single configuration file that is baked into the container image during the build stage. They want to move to a 12-factor config model. What is the most appropriate change?

   • AStore the region-specific values in environment variables that are set at release time, and build a single image for all regions.
   • BUse a single global database and cache so that all regions share the same configuration.
   • CCreate a separate container image for each region, with the region's configuration baked in during the build.
   • DKeep the configuration file but make it read-only and mount it into the container at runtime from a config server.
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6. 15foundation · easy

   What is the purpose of explicitly declaring dependencies in a 12-factor app?

   • ATo ensure that the app runs consistently across different environments.
   • BTo speed up the build process by caching dependencies.
   • CTo allow the app to use any version of a dependency automatically.
   • DTo reduce the size of the application package.
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