Hi everyone!
Yesterday I dove deep into our infra to slim down and speed up our frontend apps (Next.js).
What I worked on
- Upgrade Node (v22 LTS) + Linux base image (Alpine OS)
- Multi-stage Docker build with smart caching
- Standalone build mode in Next.js (smaller runtime)
- Place app paths following FHS (Filesystem Hierarchy Standard) - Linux distro
- Ensure the container doesn’t run as root
Why it matters
- Smaller images → faster pulls/build & deploys
- Better cache hits → shorter CI times
- Non-root runtime → safer-by-default
Key wins
- Image size:
~60% reduction (before/after in comments) - CI build time: noticeably faster
- Cleaner, standard file layout for easier ops
If you’re doing similar work, check out:
- Next.js Standalone output: https://nextjs.org/docs/14/pages/api-reference/next-config-js/output
- Linux FHS guide: https://refspecs.linuxfoundation.org/FHS_3.0/fhs-3.0.pdf
FROM public.ecr.aws/docker/library/node:22.20.0-alpine3.22 AS deps WORKDIR /usr/src/app COPY package.json yarn.lock ./ RUN yarn install --frozen-lockfile --ignore-scripts FROM public.ecr.aws/docker/library/node:22.20.0-alpine3.22 AS builder WORKDIR /usr/src/app COPY --from=deps /usr/src/app/node_modules ./node_modules COPY . . RUN if [ -f .env.template ]; then cp .env.template .env; fi RUN yarn build FROM public.ecr.aws/docker/library/node:22.20.0-alpine3.22 AS runner WORKDIR /usr/src/app ENV NODE_ENV=production RUN addgroup -g 1001 -S nodejs && adduser -S nextjs -u 1001 COPY --from=builder --chown=nextjs:nodejs /usr/src/app/.env ./.env COPY --from=builder --chown=nextjs:nodejs /usr/src/app/public ./public COPY --from=builder --chown=nextjs:nodejs /usr/src/app/.next/standalone ./ COPY --from=builder --chown=nextjs:nodejs /usr/src/app/.next/static ./.next/static USER nextjs EXPOSE 3000 ENV PORT=3000 ENV HOSTNAME="0.0.0.0" CMD ["node", "server.js"] 
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