Dockerfile

# Stage 1: Install dependencies
FROM node:20-alpine AS deps

# Required for some native packages in Alpine
RUN apk add --no-cache libc6-compat

WORKDIR /app

COPY package.json package-lock.json* ./
RUN npm ci

# Stage 2: Build the application
FROM node:20-alpine AS builder

WORKDIR /app

COPY --from=deps /app/node_modules ./node_modules
COPY . .

ENV NEXT_TELEMETRY_DISABLED=1

RUN npm run build

# Stage 3: Production runner
FROM node:20-alpine AS runner

WORKDIR /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

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

# Copy only the standalone build output
COPY --from=builder /app/public ./public

RUN mkdir .next && chown nextjs:nodejs .next


# importtant: copy the standalone server and static files with the correct ownership
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

USER nextjs

EXPOSE 3000

ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

# Use the standalone server directly
CMD ["node", "server.js"]