Node.js错误：找不到模块（本地文件）

Question

---

我正在关注Node.js的"Intro to Docker" tutorial，并且当我运行npm start时，该项目可以运行。当我运行docker run (options)时，生成了构建，但是我会在日志中找到以下错误。该项目是一个简单，简单，直接的项目，我不确定这里缺少什么。我之前在生产中遇到了一个非常类似的错误（对于没有Docker的Heroku来说），本地运行看起来不错，实时部署也遇到了类似的错误。

我不确定我是否使用了过时的东西，但是我更新了npm，docker，并且不确定还有什么可能。

感谢您的帮助！

---

错误：

internal/modules/cjs/loader.js:969

throw err;

^


Error: Cannot find module '/usr/src/app/server.js'

at Function.Module._resolveFilename (internal/modules/cjs/loader.js:966:15)

at Function.Module._load (internal/modules/cjs/loader.js:842:27)

at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)

at internal/main/run_main_module.js:17:47 {

code: 'MODULE_NOT_FOUND',

requireStack: []

}

目录：

package.json：

{
  "name": "SampleProject",
  "version": "1.0.0",
  "description": "Node.js on Docker",
  "author": "First Last <first.last@example.com>",
  "main": "server.js",
  "scripts": {
    "start": "node server.js",
    "dock": "docker run -p 1234:1234 -d <My>/<Info>"
  },
  "dependencies": {
    "core-util-is": "^1.0.2",
    "express": "^4.17.1"
  }
}

Dockerfile

    # I'm using Node.js -> Import it's image
FROM node:12

# Create app directory
WORKDIR /usr/src/app

# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./


RUN npm install
# If you are building your code for production
# RUN npm ci --only=production

# Run on port 1234
EXPOSE 1234


CMD [ "node", "server.js" ]

server.js

'use strict';

const express = require('express');

// Constants
const PORT = 1234;
const HOST = '0.0.0.0';

// App
const app = express();
app.get('/', (req, res) => {
  res.send('Hello World');
});

app.listen(PORT, HOST);
console.log(`Running on http://${HOST}:${PORT}`);

运行：

npm run dock

注意：

我还通过运行以下命令清除了该项目：

rm -rf node_modules package-lock.json && npm install && npm start

---

已解决：

---

Dockerfile

    # I'm using Node.js -> Import it's image
FROM node:12

# Create app directory
WORKDIR /usr/src/app

# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./


RUN npm install
# If you are building your code for production
# RUN npm ci --only=production

# * BEGIN SOLUTION *
# Bundle app source    
COPY . .
# *  END SOLUTION  *

# Run on port 1234
EXPOSE 1234


CMD [ "node", "server.js" ]

Answer 1

我认为您缺少以下重要部分，应该放在RUN npm install之后：

要将应用程序的源代码捆绑在docker映像中，请使用COPY指令：

# Bundle app source
COPY . .

并强制执行Dockerfile中的每个步骤，

docker build --no-cache