Deploy Next.js dengan Docker Multi-Stage + Cloudflare Tunnel

Kenapa multi-stage?

Image Next.js mode development dapat melebihi 1GB. Dengan multi-stage build (deps → builder → runner), image production turun ke ~120-150MB dan hanya berisi file yang dibutuhkan.

Dockerfile

FROM node:20-alpine AS deps
WORKDIR /app
COPY package*.json ./
RUN npm ci

FROM node:20-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build

FROM node:20-alpine AS runner
WORKDIR /app
ENV NODE_ENV=production
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static
COPY --from=builder /app/public ./public
EXPOSE 3000
CMD ["node", "server.js"]

docker-compose.yml

services:
  web:
    build: .
    restart: unless-stopped
    ports: ["3010:3000"]

HTTPS via Cloudflare Tunnel

Origin cukup berjalan HTTP di port 3000. Buat Public Hostname di Cloudflare Zero Trust (asadth95.web.id → http://localhost:3010), dan Cloudflare meng-terminate SSL di edge. Tidak perlu membuka port 80/443 ke publik — koneksi origin keluar melalui tunnel terenkripsi.

Tips production

1. Selalu output: 'standalone' di next.config.mjs
2. restart: unless-stopped agar survive reboot
3. Pisahkan log: docker compose logs -f web