Dockerfile Gen
Container Architecture & Cloud-Native Security

Multi-Stage Dockerfile Generator (Node, Go, Python, Rust)

Create hardened, lightweight multi-stage Dockerfiles for Node.js, Golang, Python, Rust, and Java with non-root security and cache optimization.

Zero Build Telemetry
CIS Docker Compliant
Quick Presets
Application & Runtime Configuration
Security Hardening
69 lines•2633 chars•2633 B
nodejs:22-alpine
# =========================================================================# Multi-Stage Dockerfile: Next.js Standalone (Hardened & Layer-Cached)# Generated by ToolsAA Multi-Stage Dockerfile Generator# =========================================================================# syntax=docker/dockerfile:1.6
# -------------------------------------------------------------------------# Stage 1: Dependencies Resolution# -------------------------------------------------------------------------FROM node:22-alpine AS depsWORKDIR /app
# Install libc6-compat if Alpine (required for some Node native extensions)RUN apk add --no-cache libc6-compat
# Install package manager lockfiles first to leverage layer cachingCOPY package.json package-lock.json* yarn.lock* pnpm-lock.yaml* bun.lockb* ./RUN --mount=type=cache,target=/root/.npm \    if [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm install --frozen-lockfile; \    elif [ -f yarn.lock ]; then yarn --frozen-lockfile; \    elif [ -f bun.lockb ]; then npm install -g bun && bun install --frozen-lockfile; \    else npm ci; fi
# -------------------------------------------------------------------------# Stage 2: Application Builder# -------------------------------------------------------------------------FROM node:22-alpine AS builderWORKDIR /app
COPY --from=deps /app/node_modules ./node_modulesCOPY . .
# Disable Next.js telemetry during compilationENV NEXT_TELEMETRY_DISABLED=1ENV NODE_ENV=production
RUN --mount=type=cache,target=/app/.next/cache \    if [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm run build; \    elif [ -f yarn.lock ]; then yarn build; \    else npm run build; fi
# -------------------------------------------------------------------------# Stage 3: Production Minimal Runner# -------------------------------------------------------------------------FROM node:22-alpine AS runnerWORKDIR /app
ENV NODE_ENV=production \    PORT=3000 \    NEXT_TELEMETRY_DISABLED=1ENV NODE_ENV=productionENV PORT=3000ENV HOSTNAME="0.0.0.0"
# Security: Create unprivileged system group and userRUN addgroup -g 10001 -S nodejs && \    adduser -u 10001 -S -G nodejs nextjs# Copy public static assets and standalone bundleCOPY --from=builder /app/public ./publicCOPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \  CMD wget --no-verbose --tries=1 --spider http://127.0.0.1:3000/api/health || exit 1EXPOSE 3000
USER nextjsCMD ["node", "server.js"]
3 Build Stages•Est: ~110 MB•-82% vs Single Stage
CIS Security: 95/100 (A+)
Estimated Final Size-82%
~110 MB

Pruned compilation tools and devDependencies from runner stage.

Security Hardening RatingGrade A+
95 / 100 CIS

UID 10001 unprivileged non-root execution with dropped capabilities.

Build Stage EfficiencyBuildKit Active
3 Separated Layers

Sub-second rebuilds via lockfile pre-caching and BuildKit mounts.

Multi-Stage Layer Optimization

Separates compilation dependencies and caches from production runner environments, reducing final image footprint by up to 92%.

CIS Benchmark Security Guardrails

Generates non-root system users (UID 10001), drops Linux capabilities, and omits build toolchains from runtime containers.

Production Standards & Compliance

All project manifests and container scripts are parsed and synthesized strictly inside browser memory without network telemetry.

Technical Reference & Architecture Guide

Multi-Stage Dockerfile Generator (Node, Go, Python, Rust) — Reference Guide

Create hardened, lightweight multi-stage Dockerfiles for Node.js, Golang, Python, Rust, and Java with non-root security and cache optimization.

Key Parameters & Controls

runtimestring

Target application runtime and language environment (e.g., node, golang, python, rust, java).

Default: node
baseImagestring

Base OS distribution or minimal runtime flavor for the final stage (e.g., alpine, debian-slim, distroless, scratch).

Default: alpine
nonRootUserboolean

Enforce least-privilege security by creating an unprivileged UID/GID (10001) and switching execution via the USER instruction.

Default: true
cacheMountsboolean

Inject BuildKit cache mounts (--mount=type=cache) for package managers (npm, pip, cargo, go) to accelerate iterative builds.

Default: true
portnumber

Primary network port exposed by the containerized application via the EXPOSE instruction.

Default: 3000

Pro Tips & Best Practices

Manifest-First Layer Ordering

Copy package manifest files (package.json, go.mod, Cargo.toml, requirements.txt) and install dependencies before copying source code. This ensures Docker reuses cached dependency layers whenever application source files change.

For compiled languages like Go

For compiled languages like Go and Rust, target 'scratch' or 'gcr.io/distroless/static' in the final production stage. Stripping out shells, package managers, and system utilities reduces final image size below 25MB and eliminates common CVE vectors.

BuildKit Cache and Secret Mounts

Use 'RUN --mount=type=cache,target=...' to persist compiler and package caches across builds without bloating the output image layers. For private registries or repositories, use '--mount=type=secret' instead of passing tokens via ARG or ENV.

Always specify explicit numeric UIDs

Always specify explicit numeric UIDs and GIDs (e.g., addgroup -g 10001 -S appgroup && adduser -u 10001 -S appuser -G appgroup). Explicit IDs ensure consistent permission checks across Kubernetes RunAsNonRoot policies.

Common Gotchas & Troubleshooting

Container crashes with 'Permission denied (EACCES)' when writing logs or temporary files.

The application is running under a non-root user without write access to working directories. Pre-allocate required folders in the Dockerfile and transfer ownership using 'RUN chown -R appuser:appgroup /app /tmp' before declaring 'USER appuser'.

Go or Rust binary fails on Alpine/Scratch with 'exec: no such file or directory'.

The binary was dynamically linked against glibc while Alpine and Scratch use musl or have no libc. For Go, compile with 'CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w"'. For Rust, build against the 'x86_64-unknown-linux-musl' target.

BuildKit cache mount directives (--mount=type=cache) produce syntax errors during build.

Add '# syntax=docker/dockerfile:1' as the very first line of your Dockerfile and verify that Docker BuildKit is active by setting 'export DOCKER_BUILDKIT=1' or using 'docker buildx build'.

Frequently Asked Questions

What is the primary architectural benefit of multi-stage Docker builds?▼

Multi-stage builds decouple the build environment (which requires compilers, SDKs, development headers, and build tools) from the runtime environment. By copying only the compiled artifacts into a clean minimal base, image size is typically reduced by 80-95% and the attack surface is dramatically minimized.

When should I choose Distroless or Scratch over Alpine Linux?▼

Choose Scratch or Distroless for compiled, statically linked binaries (Go, Rust, C++) when you need maximum security and zero shell access. Choose Alpine when your runtime requires basic shell debugging, shared C libraries (musl), or system-level package extensions while still maintaining a sub-10MB base footprint.

How do BuildKit cache mounts differ from standard Docker layer caching?▼

Standard Docker layer caching invalidates all subsequent steps as soon as any input file changes. BuildKit cache mounts (--mount=type=cache) attach a persistent directory on the build host directly to the package manager cache during the RUN instruction, reusing cached packages without storing them in the image layers.

Why is running container processes as non-root critical in production?▼

Containers share the host kernel. If a process runs as root (UID 0) inside a container and breaches isolation through a kernel vulnerability, it gains root privileges on the underlying host. Running as an unprivileged UID mitigates container escape risks and complies with Kubernetes Pod Security Standards.

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