Dockerfile

# Stage 1: Dependency installation & Build
FROM node:18-alpine AS builder
WORKDIR /app

# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
RUN apk add --no-cache libc6-compat

COPY package*.json ./
RUN npm ci

COPY . .

# Disable Next.js telemetry during build
ENV NEXT_TELEMETRY_DISABLED 1

RUN npm run build

# Stage 2: Minimal runner
FROM node:18-alpine AS runner
WORKDIR /app

ENV NODE_ENV production
ENV PORT 3000
ENV HOSTNAME "0.0.0.0"
ENV NEXT_TELEMETRY_DISABLED 1

RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

# Set up standard structure
COPY --from=builder /app/public ./public

# Set correct permission for prerender cache & uploads directory
RUN mkdir -p .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

# Create uploads folder and set ownership so uploads work correctly
RUN mkdir -p public/uploads && chown -R nextjs:nodejs public/uploads

USER nextjs

EXPOSE 3000

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