dockerlisted

# Docker — Docker Mastery ## Activate When - User invokes `/godmode:docker` - User says "Dockerfile", "docker compose", "container image", "multi-stage build" - User says "image size", "docker security", "container optimization" - User needs to containerize an application for the first time - User wants to optimize an existing Docker setup - User needs local development environment with Docker Compose - Pre-ship check identifies Docker configuration issues - Godmode orchestrator detects Dockerfile anti-patterns during `/godmode:review` ## Workflow ### Step 1: Assess Docker Context Understand the project and its containerization needs: ``` DOCKER CONTEXT ASSESSMENT: Project: Language/Runtime: <Node.js | Python | Go | Java | Rust | multi-language> Framework: <Express | Django | Spring | etc.> Build system: <npm | pip | gradle | cargo | make> Entry point: <main file or command> Current Docker state: Dockerfile: <exists | missing | multiple> Docker Compose: <exists | missing> .dockerignore: <exists | missing | incomplete> Base image: <image:tag> Image size: <current size> Build time: <current build time> Layers: <number of layers> ``` ### Step 2: Dockerfile Best Practices Create or optimize the Dockerfile using production-grade patterns: #### Multi-Stage Build Pattern ```dockerfile # --- Stage 1: Dependencies (cached separately from source code) FROM node:20-alpine AS deps WORKDIR /app COPY package.json package-lock.json ./ RUN npm ci --only=production