Dockerfile

FROM node:21-alpine AS base

# 1. Install dependencies only when needed
FROM base AS deps
# 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

WORKDIR /app

# Install dependencies based on the preferred package manager
COPY package.json package-lock.json ./
RUN npm ci


# 2. Rebuild the source code only when needed
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build

# 3. Production image, copy all the files and run next
FROM base AS runner
WORKDIR /app

ENV NODE_ENV=production

RUN addgroup -g 1001 -S nodejs
RUN adduser -S nextjs -u 1001

COPY --from=builder /app/public ./public

# Automatically leverage output traces to reduce image size (as we've created node_modules previously)
# https://nextjs.org/docs/advanced-features/output-file-tracing

# TODO: COPYING NODE MODULES IS BAD PRACTICE, BUT VIRTUOZZO DOES NOT SUPPORT INSTALLATION FOR NODE MODULES >= 18, SO JUST BYPASS IT
# https://stackoverflow.com/questions/74698021/installing-node-lib64-libm-so-6-version-glibc-2-27-not-found-required-by-n
COPY --from=deps --chown=nextjs:nextjs_group /app/node_modules ./node_modules

COPY --from=builder --chown=nextjs:nextjs_group /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nextjs_group /app/.next/static ./.next/static

USER nextjs
EXPOSE 3000
ENV PORT 3000

CMD ["npm", "run", "start"]