Today I’m going to share a very helpful tip to build smaller docker images.
Whenever I can, I look to build small docker images to run my containers.
When building a node application, for the most cases you can use the alpine version.
The default version is 10x larger than the alpine version.
node 11 4e4c445311e6 21 hours ago 894MB node 11-alpine 4b3c025f5508 21 hours ago 71.3MB
But the default version contains python, that is required to build some dependencies. So I use the default version as the builder and the alpine version to run
FROM node:11 as builder WORKDIR /app COPY package*.json ./ RUN npm install FROM node:11-alpine WORKDIR /app COPY --from=builder /app ./ COPY . ./ CMD [ "node", "index.js" ]
As the result, I got a very small image:
docker-node-multistage latest 560ab0e87e5c 20 minutes ago 74.2MB
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