Stop Using Docker like its 2015

1. What outdated Docker habits should developers drop?
Avoid using the version: field in docker-compose.yml, running containers as root, skipping healthchecks, omitting .dockerignore, creating bloated one-stage builds, and doing manual builds without caching.

2. Why are healthchecks important in Docker?
They let Docker detect if a container is truly healthy. Without them, Docker can't restart failed services, reducing reliability.

3. Why is running containers as root risky?
It poses a security threat—if compromised, it may grant host-level access. Use USER to switch to a non-root user in your Dockerfile.

4. How do .dockerignore and multi-stage builds help?
.dockerignore excludes unnecessary files, reducing image size and exposure. Multi-stage builds keep only runtime essentials, making images leaner and safer.

5. What’s the benefit of DOCKER_BUILDKIT=1 and caching?
BuildKit enables smarter caching and faster builds by skipping unchanged steps and supporting mountable caches for dependencies.

6. How has Docker improved local development?
Features like docker compose watch, bind-mounts with hot reload, and BuildKit caching make Docker efficient and dev-friendly.

7. Is Docker production-ready?
Yes—when used with best practices like healthchecks, non-root users, .dockerignore, and multi-stage builds, Docker is reliable for production.

8. Why is the version: field obsolete in Compose?
Modern Docker Compose doesn’t need it. Removing it simplifies configs and aligns with current standards.
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