Next.js のマルチステージビルドの Dockerfile

Next.js でDockerfile どうするか、よくわかりませんね。

普通にやると 1.2GB の大きさのイメージになるし、それはまずい。

と思って探したら

公式に載ってる Dockerfile 見つけました。

Docker Image – NEST.JS
https://nextjs.org/docs/deployment

# Install dependencies only when needed
FROM node:alpine 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
COPY package.json yarn.lock ./
RUN yarn install --frozen-lockfile

# Rebuild the source code only when needed
FROM node:alpine AS builder
WORKDIR /app
COPY . .
COPY --from=deps /app/node_modules ./node_modules
RUN yarn build && yarn install --production --ignore-scripts --prefer-offline

# Production image, copy all the files and run next
FROM node:alpine AS runner
WORKDIR /app

ENV NODE_ENV production

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

# You only need to copy next.config.js if you are NOT using the default configuration
# COPY --from=builder /app/next.config.js ./
COPY --from=builder /app/public ./public
COPY --from=builder --chown=nextjs:nodejs /app/.next ./.next
COPY --from=builder /app/node_modules ./node_modules
COPY --from=builder /app/package.json ./package.json

USER nextjs

EXPOSE 3000

ENV PORT 3000

# Next.js collects completely anonymous telemetry data about general usage.
# Learn more here: https://nextjs.org/telemetry
# Uncomment the following line in case you want to disable telemetry.
# ENV NEXT_TELEMETRY_DISABLED 1

CMD ["node_modules/.bin/next", "start"]

その他記事

Node.jsアプリケーションのDockerイメージのサイズを削減する方法について調べた – The Third Law
https://maku693.hatenablog.jp/entry/2021/03/08/090000

Docker with Multi Stage Buildを利用したNext.jsのDockerイメージを作る – @teitei_tk Blog
https://teitei-tk.hatenablog.com/entry/2020/10/27/190000

Nest.js製アプリのDockerイメージサイズをできる限り小さくする – 2020-12-17
https://times.hrbrain.co.jp/entry/2020/12/17/nestjs-docker-optimize