Docker Deep Dive: Beyond docker run (2026)

A 2026 Docker guide goes beyond basic container runs with production-focused Dockerfile optimization and Compose-based local development.

It contrasts a bloated Node.js image with a slimmer multi-stage build that uses layer caching, .dockerignore, and smaller base images.

The guide also shows Docker Compose for app, PostgreSQL, and Redis services, adding volumes, health checks, and restart policies.

Security and reliability best practices include running as a non-root user and using container settings that improve deployment confidence.