Next.js Dockerfile

README.md

This is the Dockerfile we use at Causal to deploy Next.js. It is loosely based on the template provided by Vercel here.

causal-frontend.Dockerfile

# this Dockerfile is run in k8s, serving the Next.js frontend

FROM node:14.17.1-buster-slim

ARG version

SHELL ["/bin/bash", "-c"]

RUN : \
    && apt-get update  \
    && apt-get upgrade -y \
    && apt-get autoremove -y \
    && rm -rf /var/lib/apt/lists/* \
    && :

# set up users

RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

# copy build output
# these are ordered from least to most likely to change between builds, so we can utilize the Docker
# build cache as much as possible

WORKDIR /app

# configures yarn to use v2, including PnP package resolution
COPY ./.yarnrc.yml ./

# needed because we use a custom configuration - if we exclude this, Next uses the default config
COPY ./packages/frontend/next.config.js ./packages/frontend/

# all public files, i.e. fonts, images, etc.
COPY ./packages/frontend/public ./packages/frontend/public

# defines environment variables
COPY ./packages/frontend/.env.production ./packages/frontend/

# PnP package resolution file used by yarn v2
COPY ./.pnp.cjs ./

# lockfile used by yarn for package resolutions
COPY ./yarn.lock ./

# defines yarn workspace
COPY ./package.json ./

# defines "yarn start" command
COPY ./packages/frontend/package.json ./packages/frontend/

# includes all our packages & their binaries - this is the equivalent of copying over node_modules
COPY ./.yarn ./.yarn

# causal-common is used as a package
COPY ./packages/causal-common/package.json ./packages/causal-common/
COPY ./packages/causal-common/build ./packages/causal-common/build

# this is the actual Next.js output
COPY --chown=nextjs:nodejs ./packages/frontend/.next ./packages/frontend/.next

# set up server

WORKDIR /app/packages/frontend
USER nextjs
ENV PORT 3000
ENV NODE_ENV production
ENV VERSION=$version
EXPOSE $PORT
CMD yarn start