找不到在docker compose环境中运行的Node js应用程序的模块 [英] Cannot find module for a node js app running in a docker compose environment

问题描述

对于我的新手问题，我感到很抱歉，但是我很难解决这个错误，我有一个Express应用程序，并且我试图在docker compose中运行它。
我已经使用了这个Dockerfile：

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

docker-compose文件：

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"

当我做docker-compose up时，出现此错误：

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 npm@3.10.10
backend_1        | npm info using node@v6.9.5
backend_1        | npm info lifecycle service-designer@1.0.0~prestart: service-designer@1.0.0
backend_1        | npm info lifecycle service-designer@1.0.0~start: service-designer@1.0.0
backend_1        | 
backend_1        | > service-designer@1.0.0 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...

如果我这样做 ls -al 在 后端 容器中，我获得了我的后端应用文件夹内容的完整列表，但这听起来像是node_modules的依赖项

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.

推荐答案

您需要在容器中安装依赖项，而Dockerfile中缺少该依赖项。

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

常见的方法是创建一个已经知道您的应用程序的Dockerfile，并使其复制您的 package.json 文件，然后执行 npm安装。

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.

这可以让您的容器在以后运行应用程序时查找所有代码依赖项。

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

请参见示例此处：
https://nodejs.org/en/docs/ guides / nodejs-docker-webapp /

示例 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" ]

当然，您可能需要为 COPY 命令修改路径。

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

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