Dockerfile

# Multi-stage build for optimized production image
# example: https://github.com/vercel/next.js/blob/canary/examples/with-docker/Dockerfile

# Stage 1: Dependencies
FROM node:22-alpine AS base

# libc6-compat is a package that provides compatibility libraries for applications that uses Alpine Linux systems
# to ensure that dynamically linked binaries compiled on other Linux distributions can run correctly.
RUN apk add --no-cache libc6-compat
WORKDIR /app

# Copy package files
COPY package.json package-lock.json* ./

# Install dependencies
RUN npm ci

# Stage 2: Builder
FROM base AS builder
WORKDIR /app

# Copy dependencies from deps stage
COPY --from=base /app/node_modules ./node_modules
COPY . .

# Uncomment the following line in case you want to disable telemetry during the build.
# ENV NEXT_TELEMETRY_DISABLED=1

# Build the application
RUN npm run build

# Stage 3: Runner (Production)
FROM base AS runner
WORKDIR /app

ENV NODE_ENV=production
# Uncomment the following line in case you want to disable telemetry during runtime.
# ENV NEXT_TELEMETRY_DISABLED=1

# Create a non-root user
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

# Copy necessary files from builder
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
# https://nextjs.org/docs/advanced-features/output-file-tracing
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

# Switch to non-root user
USER nextjs

# Expose port
EXPOSE 3000

ENV PORT=3000

# Start the application
# server.js is created by next build from the standalone output
# https://nextjs.org/docs/pages/api-reference/config/next-config-js/output
ENV HOSTNAME="0.0.0.0"
CMD ["node", "server.js"]