Node.js错误：找不到模块（本地文件）

我正在跟踪Node.js，当我运行

npm start

时，项目就开始工作了。当我运行

docker run（options）

时，会生成生成，但我会在下面的日志中找到错误。这个项目是赤裸裸的、简单的、直截了当的，我不确定我在这里遗漏了什么。我之前在生产中遇到了一个非常类似的错误（对于Heroku，没有Docker），本地运行看起来不错，而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，但我更新了npm，docker，不确定还有什么可以

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: []

}

{
  "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"
  }
}

npm run dock

目录：

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: []

}

{
  "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"
  }
}

npm run dock

package.json:

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: []

}

{
  "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"
  }
}

npm run dock

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}`);

跑步：

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: []

}

{
  "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"
  }
}

npm run dock

注意：

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: []

}

{
  "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"
  }
}

npm run dock

我还通过运行以下程序清理了项目：

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

---

已解决：

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: []

}

{
  "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"
  }
}

npm run dock

---

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" ]

    # 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" ]

---

我认为您缺少以下重要部分，应该在运行npm安装后放置：

要将应用程序的源代码捆绑到docker映像中，请使用复制说明：

# Bundle app source
COPY . .

并强制执行Dockerfile中的每个步骤

docker build --no-cache

---

我认为您只是在复制包*.json文件……您还需要在Docker内部复制项目文件，如

app.js

。@我更新了dockerfile以包含

copy根据@abestrad的回复。我相信应该覆盖相同的区域。我尝试了这个，似乎没有改变结果，我这次更新了DockerfileTry，使用
--无缓存构建，以强制执行Dockerfile中的每个步骤/指令。我不确定这是否解决了问题。构建和运行后，进程标记为“正在运行”（这是一个好迹象），但当我在浏览器中（从Docker仪表板）打开它时，没有响应。在
npm start
运行中，有一个“Hello World”响应。这是您的Hello World，
res.send（'Hello World'）为了未来读者的利益，我将在答案中添加--no缓存，