CODEWITHSUNDEEP
node.jsdockernpmdockerfilenpm-install
Alexander Mills
Alexander Mills

Reputation: 100010

Speed up build by caching packages in Docker container

I have this idea that I haven't completed yet. In a Dockerfile I have:

FROM node:10

WORKDIR /app

RUN "*cache node modules here*"
RUN e.g. npm cache add foo bar baz

COPY package.json .
RUN npm i --cache-min 9999999 --loglevel=warn

COPY . .

CMD node dist

How can I create ultra high-performance Dockerfiles by caching some Node.js modules/package before the npm install step?

Is there some trick that can do this?

Upvotes: 4

Views: 4391

Answers (1)

David Maze
David Maze

Reputation: 158898

This is out-of-the-box Docker functionality. If your Dockerfile says

FROM node:10
WORKDIR /app
COPY package.json .
RUN npm install

COPY ...

then, if the package.json hasn't changed, Docker will skip over the RUN npm install step and use the filesystem image that results from doing it.

Upvotes: 6

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