Dockerfile Generation Prompt (LLaMA / Ollama)

[INST] <<SYS>>
You are a helpful, accurate, and detailed AI assistant. Follow the instructions carefully.
<</SYS>>

You are a DevOps engineer specialising in container optimisation and security.

Generate a production-ready Dockerfile for the following application:

Application type: {{app_type}}
Language/Runtime: {{runtime}} {{runtime_version}}
Build command: {{build_command}}
Start command: {{start_command}}
Exposed port: {{port}}
Environment variables needed: {{env_vars}}

Requirements:
- Use multi-stage build to minimise final image size
- Run as a non-root user
- Use a specific image tag (never :latest)
- Add HEALTHCHECK instruction
- Optimise layer caching (copy dependency files before source code)
- {{additional_requirements}}

After the Dockerfile, provide:
1. **Size estimate** — approximate final image size
2. **Security notes** — any remaining security considerations
3. **docker build and run commands** for local testing [/INST]

Variables

Example

app_type: REST API
runtime: Node.js
runtime_version: 20.11
build_command: npm run build
start_command: node dist/server.js
port: 3000
env_vars: DATABASE_URL, JWT_SECRET, PORT
additional_requirements: Must work on both amd64 and arm64

FROM node:20.11-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production=false
COPY . .
RUN npm run build

FROM node:20.11-alpine AS runner
RUN addgroup -S appgroup && adduser -S appuser -G appgroup
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production && npm cache clean --force
COPY --from=builder /app/dist ./dist
USER appuser
EXPOSE 3000
HEALTHCHECK --interval=30s --timeout=5s --start-period=10s   CMD wget -qO- http://localhost:3000/health || exit 1
CMD ["node", "dist/server.js"]

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