> For the complete documentation index, see [llms.txt](https://openai.gitbook.io/code-cheatsheets/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://openai.gitbook.io/code-cheatsheets/all/docker/multistage.md).

# Multistage builds

Can have multiple `FROM` that start new step of build, cleaner than having multiple Dockerfiles

```
# Stage 1: Build Client
FROM node:10.11.0-alpine as build
WORKDIR /app

# Install any needed packages specified
COPY ./client/package.json .
COPY ./client/yarn.lock .
RUN yarn install

# Copy the client contents into the container at /app
COPY ./client .

# build app
RUN yarn build


# Stage 2: Run backend that serves client statically
FROM node:10.11.0-alpine
WORKDIR /app

# Copy build from previous container
COPY --from=build /app/build /app/build

# Install backend packages
COPY ./backend/package.json .
COPY ./backend/yarn.lock .
RUN yarn install

# Copy the backend contents into the container at /app
COPY ./backend .

EXPOSE 3001

# Run yarn prod when container launches
CMD ["yarn", "prod"]
```