Lightweight node.js Dockerfile

Dockerfile

ARG ALPINE_VERSION=3.11
ARG NODE_VERSION=15.5.1

##########################
# Cache-preserving image #
##########################

FROM alpine:${ALPINE_VERSION} AS deps

RUN apk --no-cache add jq

# prevent cache invalidation from changes in fields other than dependencies

COPY package.json .
COPY package-lock.json .

# override the current package version (arbitrarily set to 1.0.0) so it doesn't invalidate the build cache later

RUN (jq '{ dependencies, devDependencies }') < package.json > deps.json
RUN (jq '.version = "1.0.0"' | jq '.packages."".version = "1.0.0"') < package-lock.json > deps-lock.json

#################
# Builder image #
#################

FROM node:${NODE_VERSION} AS builder

WORKDIR /usr/src

COPY --from=deps deps.json ./package.json
COPY --from=deps deps-lock.json ./package-lock.json

RUN npm clean-install

COPY public/ public/
COPY src/ src/
COPY webpack/ webpack/

COPY package.json .

ENV NODE_ENV production

RUN npm run build

####################
# Production image #
####################

FROM node:${NODE_VERSION}-alpine${ALPINE_VERSION}

WORKDIR /usr/src

RUN chown node:node /usr/src && \
    apk add --no-cache dumb-init

COPY --chown=node:node .env.example .

COPY --from=builder --chown=node:node /usr/src/dist/ dist/
COPY --from=builder --chown=node:node /usr/src/package.json .

ENV PORT 80
ENV NODE_ENV production

USER node

CMD ["dumb-init", "node", "dist/server"]

This is fantastic, using it as inspiration for a local dockerfile. Thanks for sharing!