All 16 Docker & Containerization questions
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What is the difference between an image and a container in Docker terminology, applied to a .NET application? How does a multi-stage Dockerfile reduce the final image size for a .NET application, and what does each stage typically do? How do you configure a .NET container to respect memory and CPU limits set by the container orchestrator (like Kubernetes resource limits)? Why is it recommended to run a containerized .NET application as a non-root user, and how do you configure this in a Dockerfile? How do you pass environment-specific configuration into a running .NET container, and how does this interact with the configuration system? How does .dockerignore improve Docker build performance and image cleanliness for .NET projects? How do you configure a .NET application inside a container to listen on the correct port, and what does ASPNETCORE_URLS control? Why does copying only the .csproj file before the rest of the source code in a Dockerfile improve build caching? What is Native AOT's benefit for containerized .NET applications specifically, beyond the general startup time improvement? How does .NET's runtime automatically size the ThreadPool and GC based on container CPU limits, and what issue can arise with fractional CPU limits?
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What is Docker Compose, and how does it simplify running a multi-container .NET application locally (e.g., API + database + Redis)?

Intermediate

Answer

Docker Compose defines a multi-container application's full topology (services, networks, volumes, environment variables, dependencies) in a single YAML file, letting you start an entire local development environment -- your .NET API, a PostgreSQL database, and a Redis cache -- with one `docker compose up` command, instead of manually running and networking multiple `docker run` commands.
# docker-compose.yml
services:
  api:
    build: .
    ports: ["8080:8080"]
    environment:
      - ConnectionStrings__Db=Host=db;Database=myapp
    depends_on: [db, redis]
  db:
    image: postgres:16
    environment: ["POSTGRES_PASSWORD=devpassword"]
  redis:
    image: redis:7
Real-world example A new developer onboarding to a project runs `docker compose up` once and has a fully working local environment with the API, database, and cache all correctly networked together, without manually installing or configuring PostgreSQL or Redis locally.

Common follow-ups: How does depends_on differ from actually waiting for a dependency to be ready?;How does .NET Aspire relate to and potentially replace Docker Compose for local orchestration?

Entity Framework Core & Data Access;Caching (In-Memory Distributed & Redis)
All 16 Docker & Containerization questions