feat: Update Dockerfile for multi-stage build and adjust Next.js output configuration

Author: HimanM

aws-deploy-guide/Dockerfile

@@ -1,23 +1,51 @@
 # Use the latest Node.js image
-FROM node:latest
+FROM node:20-alpine AS base
 
-# Set the working directory inside the container
+# Install dependencies only when needed
+FROM base AS deps
+RUN apk add --no-cache libc6-compat
 WORKDIR /app
 
-# Copy package.json and package-lock.json (if available)
-COPY package*.json ./
+# Install dependencies based on the preferred package manager
+COPY package.json package-lock.json* ./
+RUN npm ci
 
-# Install dependencies
-RUN npm install
-
-# Copy the rest of the application code
+# Rebuild the source code only when needed
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 
-# Build the Next.js application
+# Remove static export for production server
+ENV NEXT_TELEMETRY_DISABLED=1
+
 RUN npm run build
 
-# Expose port 3000 to allow access
+# Production image, copy all the files and run next
+FROM base AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+COPY --from=builder /app/public ./public
+
+# Set the correct permission for prerender cache
+RUN mkdir .next
+RUN chown nextjs:nodejs .next
+
+# Automatically leverage output traces to reduce image size
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+
 EXPOSE 3000
 
-# Start the application
-CMD ["npm", "start"]
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+
+CMD ["node", "server.js"]

aws-deploy-guide/next.config.ts

@@ -3,7 +3,7 @@ import type { NextConfig } from "next";
 const nextConfig: NextConfig = {
   /* config options here */
   reactCompiler: true,
-  output: 'export',
+  output: process.env.GITHUB_ACTIONS ? 'export' : 'standalone',
   images: {
     unoptimized: true,
   },