Dockerfile

# Stage 1: Dependencies
FROM node:18-alpine AS deps
RUN apk add --no-cache libc6-compat
WORKDIR /app

# Copy package files
COPY package.json package-lock.json ./
# Install dependencies with clean install for production
RUN npm ci

# Stage 2: Builder
FROM node:18-alpine AS builder
WORKDIR /app

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

# Set production environment for build
ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

# Build Next.js application
RUN npm run build

# Stage 3: Runner (Production)
FROM node:18-alpine AS runner
WORKDIR /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1
ENV PORT=8080
ENV HOSTNAME="0.0.0.0"

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

# Copy necessary files from builder
COPY --from=builder /app/public ./public
COPY --from=builder /app/package.json ./package.json

# Copy Next.js build output
# 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 8080

# Start Next.js server
CMD ["node", "server.js"]