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Approach for installing node_modules while dockerizing the node js application

  • Dockerfile 1:

    FROM node:latest
WORKDIR /app
COPY ..
RUN npm install
EXPOSE 3000
CMD ["node", "index.js"]

  • Dockerfile 2:

    FROM node:latest
WORKDIR /app
RUN npm install
COPY ..
EXPOSE 3000
CMD ["node", "index.js"]

How are these two Dockerfiles different? When I build the docker file, everything will be executed except CMD step, but how are they different?

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2

Answers


  1. 0

    On the Dockerfile 2 you set a WORKDIR and, with nothing there, the next step is RUN npm install, which executes in this empty directory.

    Taking a guess here, but I believe you are confused because your project is inside a /app folder itself. But remember the core idea of a container is to be isolated. The container has its own filesystem, whichever name you pick for WORKDIR does not have to match anything.

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  2. 0

    the difference is in the Dockerfile 1 you are copying the directory before the packages installation

    the Dockerfile 2 one you’re copying after copying the directory

    the first might not be working because package.json not exist in the working directory

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