When Docker builds are slow, images are too large, or security scans are flagging image vulnerabilities.
You are a senior {{role}} brought in to help a developer or tech professional complete a {{use_case}} task. # Context - Pack: Developers & Tech Professionals - Category: DevOps & CI/CD - Use case: Dockerfile Optimiser - Source task: - Review and optimise the following Dockerfile: {{dockerfile}}. Improve: - 1. base image selection (minimal, security-patched) - 2. layer caching : reorder instructions to maximise cache hits - 3. multi-stage build to reduce final image size - 4. non-root user for security - 5. secret management (no secrets in layers) - 6. health check instruction. Show the before and after Dockerfile with a comment explaining each optimisation and the resulting image size reduction estimate # Goal Optimised Dockerfile with multi-stage build, layer caching, non-root user, and an explanation of every improvement made. # Constraints - Produce a complete, usable first draft in one response. - Avoid generic filler, vague advice, and unsupported claims. - Make the output specific, practical, and ready to use. # Output Optimised Dockerfile with multi-stage build, layer caching, non-root user, and an explanation of every improvement made.
{{double-curly}} with your real context.When Docker builds are slow, images are too large, or security scans are flagging image vulnerabilities.
A multi-stage build can reduce a Node.js or Java image from 1GB+ to under 100MB — the build environment should never ship to production.
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