Executive Summary: Multi-stage Docker builds, image size optimization down to <100MB, non-root user execution, and container health check monitoring.
Containerizing application workloads ensures 100% environment parity between local development and cloud production.
By separating build dependencies (compilers, npm devDependencies) from runtime execution layers, production Docker images drop from 1.2GB down to under 90MB.
Never run production Docker containers as root. Specify unprivileged system users (USER node or USER www-data) to prevent container breakout vulnerabilities.
Configure CPU and RAM limits (deploy.resources.limits) in Docker Compose to prevent any single buggy process from starving adjacent container services.
1. Multi-Stage Builds for Minimal Image Size
By separating build dependencies (compilers, npm devDependencies) from runtime execution layers, production Docker images drop from 1.2GB down to under 90MB.
2. Running as Non-Root User
Never run production Docker containers as root. Specify unprivileged system users (USER node or USER www-data) to prevent container breakout vulnerabilities.
3. Container Resource Limits & Logging
Configure CPU and RAM limits (deploy.resources.limits) in Docker Compose to prevent any single buggy process from starving adjacent container services.