找不到在Docker撰写环境中运行的节点js应用程序的模块

我很抱歉我的新手问题,但我有一个可怕的一天搞清楚这个错误,我有一个快速的应用程序,我试图运行它在docker写作。 我用过这个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 

和我的docker合成文件的这一部分:

 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组装起来,我得到这个错误:

 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... 

如果我在后端容器中执行ls -al ,我会得到后端应用程序文件夹内容的完整列表,但听起来像是node_modules依赖关系无法识别。

您需要在Dockerfile中缺less的容器中安装依赖项。

通常的方法是创build一个已经知道你的应用程序的Dockerfile,并使其复制你的package.json文件并执行一个npm install

这允许您的容器在稍后运行应用程序时查找所有的代码依赖关系。

请参阅以下示例: 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,您可能需要修改COPY命令的path。