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15. Infrastructure, Docker & DevOps

What is Docker?​

Junior

Answer: A platform for developing, shipping, and running applications in containers, ensuring that the application runs the same in any environment.

Docker ENV vs ARG​

Middle

Answer:

  • ARG: Variables available only during the image build process.
  • ENV: Variables available during the build and also while the container is running.

What are Docker Volumes?​

Middle

Answer: A way to persist data generated by and used by Docker containers, separated from the container's lifecycle.

What is the difference between Horizontal and Vertical scaling?​

Middle

Answer:

  • Vertical Scaling: Adding more resources (CPU, RAM) to a single server.
  • Horizontal Scaling: Adding more servers to distribute the load.

What is CI/CD?​

Senior

Answer:

  • Continuous Integration (CI): Automating the building and testing of code when changes are committed.
  • Continuous Delivery/Deployment (CD): Automating the deployment of code to production or staging environments.

RabbitMQ vs Kafka​

Senior

Answer:

  • RabbitMQ: A message broker that focuses on delivering messages to consumers (Push model). Great for complex routing.
  • Kafka: A distributed streaming platform that focuses on high throughput and data persistence (Pull model). Great for log processing.