title: Error "enoent ENOENT: no such file or directory, open '/app/package.json'" docker referencing to external folder
body: <p>I have my whole <code>nodejs</code> code in <code>abc</code> folder</p>
  
  <pre><code>root@ip-10-0-0-9:~/standalone/apiserver# ls
  Dockerfile  abc
  root@ip-10-0-0-9:~/standalone/apiserver/abc# ls
  build  index.html  node_modules  package.json  package-lock.json  src
  </code></pre>
  
  <p>I have created Dockerfile in following manner:</p>
  
  <pre><code>FROM node:10
  #Create app directory
  WORKDIR /app
  COPY abc/package*.json /app/
  RUN npm install
  CMD ["npm","start"]
  </code></pre>
  
  <p>When i am running my docker container in following way,it gives error:</p>
  
  <pre><code>docker build -t node-app .
  
  root@ip-10-0-0-9:~/standalone/apiserver# docker run -it   --net=host   -v /abc:/app   --name mynodeapp1 node-app
  npm ERR! path /app/package.json
  npm ERR! code ENOENT
  npm ERR! errno -2
  npm ERR! syscall open
  npm ERR! enoent ENOENT: no such file or directory, open '/app/package.json'
  npm ERR! enoent This is related to npm not being able to find a file.
  npm ERR! enoent
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     /root/.npm/_logs/2018-05-14T14_36_09_651Z-debug.log
  </code></pre>
  
  <p>Update:</p>
  
  <p>Contents of package.json file is as follows:</p>
  
  <pre><code>{
    "name": "abc",
    "description": "A Vue.js project",
    "version": "1.0.0",
    "author": "utkarsh",
    "license": "MIT",
    "private": true,
    "scripts": {
      "start": "nodemon src/server.js",
      "lint": "eslint **/*.js"
    },
    "dependencies": {
      "body-parser": "^1.18.2",
      "cors": "^2.8.4",
      "express": "^4.16.2",
      "jquery": "^3.3.1",
      "moment": "^2.20.1",
      "morgan": "^1.9.0",
      "mysql": "^2.15.0",
      "nodemon": "^1.14.12"
    },
    "browserslist": [
      "&gt; 1%",
      "last 2 versions",
      "not ie &lt;= 8"
    ],
    "devDependencies": {
      "babel-core": "^6.26.0",
      "babel-loader": "^7.1.2",
      "babel-preset-env": "^1.6.0",
      "babel-preset-stage-3": "^6.24.1",
      "cross-env": "^5.0.5",
      "webpack": "^3.6.0",
      "webpack-dev-server": "^2.9.1"
    }
  }
  </code></pre>