Agent Skills/docker-first-architecture
DevOps, Tooling & CI/CD PipelinesSKILL.md

docker-first-architecture

Enforces multi-stage production Dockerfiles, optimal toolchains (pnpm, uv, static Go), and Docker Hub automation.

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Docker-First & Image-First Architecture Skill

This skill defines the official architectural guidelines, containerization blueprints, and publishing standards across all services in the personal projects ecosystem. It enforces a **Docker-First and Image-First** doctrine to guarantee infrastructure portability from Vercel/Render edge environments to AWS (Terraform + ECS/EKS) and sovereign self-hosting.

1. Overview & Objective

Every service—regardless of language or framework—must be fully containerized, reproducible, and published to Docker Hub (`shardendumishra22/*`).

Portability Roadmap

  • **Phase 1 (Current)**: Hybrid Edge/PaaS (Vercel serverless frontends, Render container backends, Neon serverless PostgreSQL, Docker Hub registry).
  • **Phase 2 (Cloud Evolution)**: AWS Cloud Native (Terraform IaC, AWS ECS Fargate or EKS, Application Load Balancers, CloudFront, Docker Hub / ECR).
  • **Phase 3 (Sovereign Infrastructure)**: Self-Hosted Bare Metal / VPS (Docker Compose / Nomad / K3s, Traefik / Nginx reverse proxy, automated backup sync).

    • 2. Core Directives & Toolchain Standards

    IMPORTANT

    **OPTIMAL TOOLCHAIN MANDATE**: Always employ the fastest, most deterministic tools: - **Node.js / TypeScript**: `pnpm` exclusively (via Corepack). Never use `npm` or legacy `yarn`. - **Python**: `uv` exclusively (`ghcr.io/astral-sh/uv:latest`). Never use plain `pip` or slow virtualenv setups. - **Go**: Static compilation (`CGO_ENABLED=0`, `-ldflags="-w -s"`). Never deploy dynamic glibc-dependent Go binaries. - **Static Frontends (Preact / Svelte / React)**: Multi-stage `pnpm` builder with `nginx:alpine` runner.

    Mandatory Container Hardening Rules:

  • **Multi-Stage Builds**: Build tooling, SDKs, and source compilers MUST NEVER exist in the production runtime stage.
  • **Non-Root Execution**: Every runtime image MUST define and execute as an unprivileged user (`nextjs`, `appuser`, `workeruser`).
  • **Healthcheck Directives**: Every service image MUST include an active `HEALTHCHECK` probing its readiness endpoint.
  • **Minimal Attack Surface**: Base runtime stages on `alpine:3.21`, `python:3.12-slim`, or `distroless`.
  • **Context Efficiency**: Every project MUST contain a `.dockerignore` pruning `node_modules`, `.git`, test artifacts, and caches.
  • **Automated Docker Hub Registry**: Every repository MUST include a GitHub Actions workflow building and publishing multi-platform or linux/amd64 images to `shardendumishra22/<image-name>`.

    • 3. Technology Blueprints

    Blueprint A: Next.js 16 Standalone (Node 22 + pnpm)

  • `next.config.ts` must set `output: "standalone"`.
  • Multi-stage build copies `.next/standalone`, `.next/static`, and `public`.
  • Runs as `nextjs:nodejs` on port 3000.

    • Blueprint B: Static SPAs (Preact / Svelte 5 / Vite + Nginx)

  • Builds static assets to `dist/` with `pnpm --filter <app> build`.
  • Deploys into `nginx:alpine`.
  • Custom `nginx.conf` handles SPA routing fallback (`try_files $uri $uri/ /index.html;`), gzip compression, and `/health`.

    • Blueprint C: Go 1.25 API / Microservice

  • `golang:alpine` builder with `go mod download`.
  • Static compilation: `CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o /bin/server .`.
  • Runtime stage: `alpine:3.21` with `ca-certificates`, `tzdata`, `curl`, running as `appuser`.

    • Blueprint D: Python 3.12 AI / API Service (FastAPI + uv)

  • Installs `uv` from `ghcr.io/astral-sh/uv:latest`.
  • `uv sync --frozen --no-dev --no-install-project` with `UV_COMPILE_BYTECODE=1`.
  • Runtime stage: `python:3.12-slim` with unprivileged `appuser`.

    • Blueprint E: Express 5 + TypeScript + Drizzle API

  • Compiles TypeScript to `dist/`.
  • Prunes dependencies with `pnpm install --prod --frozen-lockfile`.
  • Runtime stage: `node:22-alpine` with non-root `appuser`.

    • 4. Verification & Testing Runbook

    bash
    # 1. Validate Docker daemon is operational
docker info

# 2. Build image locally with Buildx
docker build -t shardendumishra22/<service-name>:local .

# 3. Test local container execution & healthcheck
docker run -d --name test-<service-name> -p <port>:<port> shardendumishra22/<service-name>:local
sleep 5
docker ps --filter name=test-<service-name>
curl -f http://localhost:<port>/health || exit 1
docker rm -f test-<service-name>

# 4. Verify Compose environment
docker compose up -d
docker compose ps
docker compose down