Agent skill
docker-2-multi-stage-builds
Sub-skill of docker: 2. Multi-Stage Builds.
Install this agent skill to your Project
npx add-skill https://github.com/vamseeachanta/workspace-hub/tree/main/.claude/skills/_archive/operations/devtools/docker/2-multi-stage-builds
SKILL.md
2. Multi-Stage Builds
2. Multi-Stage Builds
Python Multi-Stage Build:
# Stage 1: Build dependencies
FROM python:3.12-slim AS builder
WORKDIR /app
# Install build dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
gcc \
libpq-dev \
&& rm -rf /var/lib/apt/lists/*
# Create virtual environment
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"
# Install dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt
# Stage 2: Production image
FROM python:3.12-slim AS production
WORKDIR /app
# Install runtime dependencies only
RUN apt-get update && apt-get install -y --no-install-recommends \
libpq5 \
curl \
&& rm -rf /var/lib/apt/lists/*
# Copy virtual environment from builder
COPY --from=builder /opt/venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"
# Copy application code
COPY . .
# Create non-root user
RUN useradd --create-home --shell /bin/bash appuser \
&& chown -R appuser:appuser /app
USER appuser
EXPOSE 8000
HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
CMD curl -f http://localhost:8000/health || exit 1
CMD ["gunicorn", "--bind", "0.0.0.0:8000", "app:app"]
Node.js Multi-Stage Build:
# Stage 1: Install dependencies
FROM node:20-alpine AS deps
WORKDIR /app
COPY package*.json ./
RUN npm ci
# Stage 2: Build application
FROM node:20-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build
# Stage 3: Production image
FROM node:20-alpine AS production
WORKDIR /app
ENV NODE_ENV=production
# Copy only production dependencies
COPY --from=deps /app/node_modules ./node_modules
COPY --from=builder /app/dist ./dist
COPY --from=builder /app/package*.json ./
USER node
EXPOSE 3000
CMD ["node", "dist/server.js"]
Go Multi-Stage Build (minimal image):
# Stage 1: Build
FROM golang:1.22-alpine AS builder
WORKDIR /app
# Download dependencies
COPY go.mod go.sum ./
RUN go mod download
# Copy source and build
COPY . .
RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o /app/main .
# Stage 2: Minimal production image
FROM scratch
# Copy SSL certificates for HTTPS
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
# Copy binary
COPY --from=builder /app/main /main
EXPOSE 8080
ENTRYPOINT ["/main"]
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