Javascript 如何将dockerfile环境变量传递到node.js文件？

如何将dockerfile环境变量传递到node.js文件？我遵循docker文档传递ENV变量，没有传递任何变量。对这个问题有什么见解吗

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dockerfile：

FROM 10.118.224.132:5000/node:8.6.0-wheezy

ENV PORT 6000
ENV iamIP2="10.118.225.199"
ENV iamPort 9999
ENV iamPort2=9997
RUN apt-get update

WORKDIR /usr/src/app
COPY package.json /usr/src/app
COPY . .  

ENV mongoDBurl=10.118.225.149:27017/globalIndex
CMD ["node", "server.js"]

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server.js：

"use strict";   

const fs = require('fs');
const http = require('http');
const cors = require('cors');
const request = require('request');

const link1  = process.env.PROXY_IAM_URI;
const iamIP ="10.118.225.164"; console.log("iamIP: " + iamIP);
//const iamIP = /\d+.\d+.\d+.\d+/g.exec(link1)[0]; console.log("iamIP: "+iamIP);
//const iamPort = /\d{2,}$/g.exec(link1)[0]; console.log("iamPort "+ iamPort);
const iamPort =0; console.log("iamPort "+ iamPort);

var iamIP2 ; console.log("iamIP2 "+ iamIP2);
var iamPort2 ; console.log("iamPort2 "+ iamPort2);

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console.log（响应）：

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您应该能够在Node.js中使用

process.env

process.env.iamIP2      // "10.118.225.199"
process.env.iamPort     // 9999
process.env.iamPort2    // 9997
process.env.mongoDBurl  // 10.118.225.149:27017/globalIndex

process.env.iamIP2      // "10.118.225.199"
process.env.iamPort     // 9999
process.env.iamPort2    // 9997
process.env.mongoDBurl  // 10.118.225.149:27017/globalIndex