Node + Docker with proper caching

.dockerignore

Dockerfile
node_modules

Dockerfile

# Specify Node version
FROM node:latest

WORKDIR /tmp/build
ENV NODE_ENV=production

# Copy only required files for fetching dependencies
COPY package.json yarn.lock /tmp/build/
RUN yarn --prod

# Move node_modules outside (to avoid overriding)
RUN mv /tmp/build/node_modules /tmp/node_modules

# Copy the whole app in
COPY . /tmp/build

# Replace node_modules
RUN rm -rf /tmp/build/node_modules && cp -a /tmp/node_modules /tmp/build/node_modules

# Build the app
RUN yarn build

WORKDIR /usr/src/app

# Copy only app runtime (required files for app to run) 
RUN cp -a /tmp/build/node_modules /tmp/build/dist /tmp/build/package.json /tmp/build/config /usr/src/app/ && rm -rf /tmp/build

# Set environment variables
ENV PORT=80

# Start app
CMD yarn start

EXPOSE 80