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Kenil Vasani
Kenil Vasani

Kenil Vasani

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Asked: 2020-12-22T07:07:36+00:00

Cannot find module for a node js app running in a docker compose environment

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I am sorry for my very newbie question, but I am having a terrible day figuring out this error, I have an Express app and I am trying to run it in docker compose.
I’ve used this Dockerfile:

FROM mhart/alpine-node
RUN mkdir -p /usr/src/app
RUN chmod -R 777 /usr/src/app
WORKDIR /usr/src/app
RUN npm install node-gyp -g
RUN npm install nodemon -g
ENV NODE_ENV development
EXPOSE 3000

And this portion of my docker-compose file:

backend:
    mem_limit: 100m
    build:
      context: .
      dockerfile: dockerfiles/node/Dockerfile
    command: npm start
    depends_on:
      - mongo
      - elasticsearch
    volumes:
      - ./backend/:/usr/src/app
    ports:
      - 3000:3000
    links:
      - "mongo:mongo"
      - "elasticsearch:elasticsearch"

When I do docker-compose up, I get this error:

backend_1        | npm info it worked if it ends with ok
backend_1        | npm info using npmRohit Jogani.10.10
backend_1        | npm info using [email protected]
backend_1        | npm info lifecycle service-designerRohit Patel.0.0~prestart: service-designerRohit Patel.0.0
backend_1        | npm info lifecycle service-designerRohit Patel.0.0~start: service-designerRohit Patel.0.0
backend_1        | 
backend_1        | > service-designerRohit Patel.0.0 start /usr/src/app
backend_1        | > nodemon index.js
backend_1        | 
backend_1        | [nodemon] 1.11.0
backend_1        | [nodemon] to restart at any time, enter `rs`
backend_1        | [nodemon] watching: *.*
backend_1        | [nodemon] starting `node index.js`
backend_1        | module.js:471
backend_1        |     throw err;
backend_1        |     ^
backend_1        | 
backend_1        | Error: Cannot find module 'dotenv'
backend_1        |     at Function.Module._resolveFilename (module.js:469:15)
backend_1        |     at Function.Module._load (module.js:417:25)
backend_1        |     at Module.require (module.js:497:17)
backend_1        |     at require (internal/module.js:20:19)
backend_1        |     at Object.<anonymous> (/usr/src/app/index.js:1:63)
backend_1        |     at Module._compile (module.js:570:32)
backend_1        |     at Object.Module._extensions..js (module.js:579:10)
backend_1        |     at Module.load (module.js:487:32)
backend_1        |     at tryModuleLoad (module.js:446:12)
backend_1        |     at Function.Module._load (module.js:438:3)
backend_1        | [nodemon] app crashed - waiting for file changes before starting...

If I do ls -al in the backend container, I get a full list of my backend app folder content, but it sounds like node_modules dependencies are not recognized.

dockerdocker-composenode.jsnpm
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    1 Answer

    1. Kenil Vasani

      Kenil Vasani

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      Best Answer

      You need to install the dependencies in the container, which is missing from your Dockerfile.

      The common way is to create a Dockerfile that is already aware of your application, and make it copy your package.json file and perform an npm install.

      This allows your container to find all your code dependencies when you later run your application.

      See and example here:
      https://nodejs.org/en/docs/guides/nodejs-docker-webapp/

      The sample Dockerfile:

      FROM node:boron

# Create app directory
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

# Install app dependencies
COPY package.json /usr/src/app/
RUN npm install

# Bundle app source
COPY . /usr/src/app

EXPOSE 8080
CMD [ "npm", "start" ]

      You may need to adapt paths for the COPY command, of course.

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