dockerfilelisted

# /dockerfile — Generate a Dockerfile ## Input examples ``` /dockerfile .NET 10 Minimal API --prod /dockerfile Angular 20 nginx --prod /dockerfile Python FastAPI /dockerfile Go service --prod /dockerfile --dev fullstack .NET + Angular (docker-compose dev) ``` ## Process 1. Detect the stack → pick the right base image 2. Multi-stage build: build stage → runtime stage 3. Security hardening 4. L1 approval → Write ## Mandatory rules - **Multi-stage build** — separate build and runtime - **Non-root user** — NEVER run the container as root - **Specific tag** — `mcr.microsoft.com/dotnet/aspnet:10.0-alpine`, NEVER `latest` - **COPY before RUN** — leverage layer caching (copy csproj/package.json first, restore, then copy source) - **.dockerignore** — exclude bin/, obj/, node_modules/, .git/ - **HEALTHCHECK** — mandatory for production - **NEVER hardcode** secrets/connection strings — use env vars - **Alpine-based** whenever possible (small image size) ## Output ``` Dockerfile .dockerignore ``` ## References - @.claude/rules/docker-conventions.md