Docker image bloat is a common pain point in production, leading to slower deployments, higher storage costs, and increased attack surface. This article details a systematic approach to slimming images from 1GB to 50MB while enforcing security best practices. Key techniques include multi-stage builds to eliminate build-time dependencies, using minimal base images like Alpine or distroless, and pruning unnecessary packages and files. The author also integrates vulnerability scanning with tools like Trivy and Docker Scout, and applies least-privilege user configurations. For teams running containerized workloads at scale, these optimizations can reduce infrastructure costs by up to 90% and improve deployment speed. The guide is production-tested and includes concrete Dockerfile examples. While the original source is a Chinese blog, the techniques are universally applicable. Our coverage adds original benchmarks comparing image sizes and security scores across different optimization strategies, along with a checklist for CI/CD pipeline integration.
A practical guide to reducing Docker image size from 1GB to 50MB with security hardening, covering multi-stage builds and vulnerability scanning.