暴露的Heroku $端口一飲而盡任務

Question

我建立一個碼頭工人形象有以下Dockerfile

FROM node:latest 

RUN npm install -g gulp 

# 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 5000 

CMD ["gulp", "serveprod"] 

我知道我需要從Heroku的文檔暴露$PORT變量。

但是，我不知道這是如何與吞嚥工作。

這是我的gulpfile.js和serveprod任務。

gulp.task('serveprod', function() { 
    connect.server({ 
     root: './', 
     port: $PORT || process.env.PORT || 5000, // localhost:5000 
     livereload: false 
    }); 
}); 

以前，我用的是節點buildpack和所有我需要的是port:和process.env.PORT它會工作得很好。我曾嘗試添加$PORT，但這仍然無法正常工作。

UPDATE：

我只是試圖把這個在我Dockerfile

ENV 5000 $PORT 

這裏是Heroku的日誌：

2017-07-07T15:01:27.127275+00:00 heroku[web.1]: Starting process with command `gulp serveprod` 
2017-07-07T15:01:29.985824+00:00 heroku[web.1]: State changed from starting to crashed 
2017-07-07T15:01:29.875500+00:00 app[web.1]: module.js:487 
2017-07-07T15:01:29.875515+00:00 app[web.1]:  throw err; 
2017-07-07T15:01:29.875517+00:00 app[web.1]: ^
2017-07-07T15:01:29.875517+00:00 app[web.1]: 
2017-07-07T15:01:29.875518+00:00 app[web.1]: Error: Cannot find module './lib/_stream_readable.js' 
2017-07-07T15:01:29.875519+00:00 app[web.1]:  at Function.Module._resolveFilename (module.js:485:15) 
2017-07-07T15:01:29.875519+00:00 app[web.1]:  at Function.Module._load (module.js:437:25) 
2017-07-07T15:01:29.875520+00:00 app[web.1]:  at Module.require (module.js:513:17) 
2017-07-07T15:01:29.875521+00:00 app[web.1]:  at require (internal/module.js:11:18) 
2017-07-07T15:01:29.875539+00:00 app[web.1]:  at Object.<anonymous> (/usr/local/lib/node_modules/gulp/node_modules/through2/node_modules/readable-stream/readable.js:12:30) 
2017-07-07T15:01:29.875540+00:00 app[web.1]:  at Module._compile (module.js:569:30) 
2017-07-07T15:01:29.875541+00:00 app[web.1]:  at Object.Module._extensions..js (module.js:580:10) 
2017-07-07T15:01:29.875541+00:00 app[web.1]:  at Module.load (module.js:503:32) 
2017-07-07T15:01:29.875542+00:00 app[web.1]:  at tryModuleLoad (module.js:466:12) 
2017-07-07T15:01:29.875543+00:00 app[web.1]:  at Function.Module._load (module.js:458:3) 
2017-07-07T15:01:29.971237+00:00 heroku[web.1]: Process exited with status 1 
2017-07-07T15:01:32.103467+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=www.christopherdbolton.com request_id=469ad736-103a-461f-af20-91454a8a83f1 fwd="139.72.158.28" dyno= connect= service= status=503 bytes= protocol=http 
2017-07-07T15:01:32.923798+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=www.christopherdbolton.com request_id=a5c0b8c4-69c7-4bd7-ab00-372fe625b2f8 fwd="139.72.158.28" dyno= connect= service= status=503 bytes= protocol=http 
Disconnected from log stream. There may be events happening that you do not see here! Attempting to reconnect... 
2017-07-07T15:01:29.875520+00:00 app[web.1]:  at Module.require (module.js:513:17) 
2017-07-07T15:01:29.875521+00:00 app[web.1]:  at require (internal/module.js:11:18) 
2017-07-07T15:01:29.875539+00:00 app[web.1]:  at Object.<anonymous> (/usr/local/lib/node_modules/gulp/node_modules/through2/node_modules/readable-stream/readable.js:12:30) 
2017-07-07T15:01:29.875541+00:00 app[web.1]:  at Object.Module._extensions..js (module.js:580:10) 
2017-07-07T15:01:29.875540+00:00 app[web.1]:  at Module._compile (module.js:569:30) 
2017-07-07T15:01:29.875541+00:00 app[web.1]:  at Module.load (module.js:503:32) 
2017-07-07T15:01:29.875542+00:00 app[web.1]:  at tryModuleLoad (module.js:466:12) 
2017-07-07T15:01:29.875543+00:00 app[web.1]:  at Function.Module._load (module.js:458:3) 

Answer 1

而不是開始gulp serveprod，開始npm start。

下面是所得Dockerfile：

FROM node:latest 

RUN npm install -g gulp 

# 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 

CMD ["npm", "start"] 

這裏是package.json：

"scripts": { 
    "build": "gulp", 
    "start": "gulp serveprod" 
    }