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114 lines
3.5 KiB
Docker
114 lines
3.5 KiB
Docker
# Multi-stage Dockerfile for Next.js Blog Application
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# Optimized for Static Site Generation with standalone output
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# Final image size: ~150MB
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# ============================================
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# Stage 1: Dependencies Installation
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# ============================================
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FROM node:22-alpine AS deps
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# Install libc6-compat for better compatibility
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RUN apk add --no-cache libc6-compat
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WORKDIR /app
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# Copy package files for dependency installation
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# These files are copied first to leverage Docker layer caching
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# If package.json hasn't changed, this layer will be reused
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COPY package.json package-lock.json* ./
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# Install dependencies using npm ci for reproducible builds
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# --only=production flag is not used here because we need dev dependencies for build
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RUN npm ci
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# ============================================
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# Stage 2: Build Next.js Application
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# ============================================
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FROM node:22-alpine AS builder
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WORKDIR /app
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# Copy dependencies from deps stage
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COPY --from=deps /app/node_modules ./node_modules
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# Copy .env file for build-time variables
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# This file is created by CI/CD workflow from Gitea secrets
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# NEXT_PUBLIC_* variables are embedded in client-side bundle during build
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COPY .env* ./
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# Copy all application source code
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# This includes:
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# - app/ directory (Next.js 16 App Router)
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# - components/ directory
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# - lib/ directory (markdown utilities)
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# - content/blog/ directory (markdown blog posts)
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# - public/ directory (static assets)
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# - next.config.js, tsconfig.json, tailwind.config.js, etc.
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COPY . .
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# Set environment variables for build
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ENV NEXT_TELEMETRY_DISABLED=1
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ENV NODE_ENV=production
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# Build the Next.js application
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# This will:
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# 1. Process all markdown files from content/blog/
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# 2. Generate static pages for all blog posts (SSG)
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# 3. Create standalone output in .next/standalone/
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# 4. Optimize images and assets
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# 5. Bundle and minify JavaScript
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RUN npm run build
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# ============================================
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# Stage 3: Production Runtime
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# ============================================
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FROM node:22-alpine AS runner
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# Install curl for health checks
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RUN apk add --no-cache curl
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WORKDIR /app
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# Set production environment
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ENV NODE_ENV=production
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ENV NEXT_TELEMETRY_DISABLED=1
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# Create a non-root user for security
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# The application will run as this user instead of root
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RUN addgroup --system --gid 1001 nodejs && \
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adduser --system --uid 1001 nextjs
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# Copy only the necessary files from builder stage
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# Next.js standalone output includes all dependencies needed to run
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COPY --from=builder /app/public ./public
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# Copy standalone output (includes minimal node_modules and server files)
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COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
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# Copy static files (CSS, JS bundles, optimized images)
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COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
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# Create directories for logs (optional, if your app writes logs)
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RUN mkdir -p /app/logs && chown nextjs:nodejs /app/logs
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# Switch to non-root user
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USER nextjs
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# Expose the application port
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# Note: This matches the port in package.json "dev" script (-p 3030)
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EXPOSE 3030
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# Set the port environment variable
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ENV PORT=3030
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ENV HOSTNAME="0.0.0.0"
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# Health check to verify the application is running
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# Docker will periodically check this endpoint
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# If it fails, the container is marked as unhealthy
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HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
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CMD curl -f http://localhost:3030/ || exit 1
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# Start the Next.js server
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# The standalone output includes a minimal server.js file
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CMD ["node", "server.js"]
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