Question

我在Heroku上部署了一个Django应用程序，但由于某些要求，我必须创建一个基本的nodejs文件，我希望在同一个dyno上运行它。我搜索了解决方案，但除了博客之外不能提出太多相同的内容https://blog.heroku.com/heroku-django-node 所以，我确实安装了buildpack，我的个人资料是： Procfile：

web: bin/runsvdir-dyno

Profile.web

django: gunicorn exampledjangoapp.wsgi:application --bind 127.0.0.1:$DJANGO_PORT
node: node node_app/app.js

我也在Heroku中创建了NODE_ENV和DJANGO_PORT配置。以下是我在日志中看到的内容：

 Error: listen EADDRINUSE :::56842
2017-05-05T21:02:15.241005+00:00 app[web.1]:     at Object.exports._errnoException (util.js:1022:11)
2017-05-05T21:02:15.241006+00:00 app[web.1]:     at exports._exceptionWithHostPort (util.js:1045:20)
2017-05-05T21:02:15.241007+00:00 app[web.1]:     at Server._listen2 (net.js:1259:14)
2017-05-05T21:02:15.241007+00:00 app[web.1]:     at listen (net.js:1295:10)
2017-05-05T21:02:15.241008+00:00 app[web.1]:     at Server.listen (net.js:1391:5)
2017-05-05T21:02:15.241009+00:00 app[web.1]:     at Object.<anonymous> (/app/node_app/app.js:15:4)
2017-05-05T21:02:15.241009+00:00 app[web.1]:     at Module._compile (module.js:570:32)
2017-05-05T21:02:15.241010+00:00 app[web.1]:     at Object.Module._extensions..js (module.js:579:10)
2017-05-05T21:02:15.241011+00:00 app[web.1]:     at Module.load (module.js:487:32)
2017-05-05T21:02:15.241011+00:00 app[web.1]:     at tryModuleLoad (module.js:446:12)
2017-05-05T21:02:15.285970+00:00 app[web.1]: buildpack=runit ps=node at=exit status=1 waitpid_lsb=0
2017-05-05T21:02:15.305915+00:00 app[web.1]: buildpack=runit ps=node at=start
2017-05-05T21:02:16.126572+00:00 app[web.1]: events.js:160
2017-05-05T21:02:16.126582+00:00 app[web.1]:       throw er; // Unhandled 'error' event
2017-05-05T21:02:16.126583+00:00 app[web.1]:       ^
2017-05-05T21:02:16.126584+00:00 app[web.1]: 
2017-05-05T21:02:16.126584+00:00 app[web.1]: Error: listen EADDRINUSE :::56842
2017-05-05T21:02:16.126585+00:00 app[web.1]:     at Object.exports._errnoException (util.js:1022:11)
2017-05-05T21:02:16.126586+00:00 app[web.1]:     at exports._exceptionWithHostPort (util.js:1045:20)
2017-05-05T21:02:16.126587+00:00 app[web.1]:     at Server._listen2 (net.js:1259:14)
2017-05-05T21:02:16.126587+00:00 app[web.1]:     at listen (net.js:1295:10)
2017-05-05T21:02:16.126588+00:00 app[web.1]:     at Server.listen (net.js:1391:5)
2017-05-05T21:02:16.126589+00:00 app[web.1]:     at Object.<anonymous> (/app/node_app/app.js:15:4)
2017-05-05T21:02:16.126589+00:00 app[web.1]:     at Module._compile (module.js:570:32)
2017-05-05T21:02:16.126590+00:00 app[web.1]:     at Object.Module._extensions..js (module.js:579:10)
2017-05-05T21:02:16.126591+00:00 app[web.1]:     at Module.load (module.js:487:32)
2017-05-05T21:02:16.126591+00:00 app[web.1]:     at tryModuleLoad (module.js:446:12)
2017-05-05T21:02:16.154176+00:00 app[web.1]: buildpack=runit ps=node at=exit status=1 waitpid_lsb=0
2017-05-05T21:02:16.287874+00:00 heroku[web.1]: Process exited with status 111
2017-05-05T21:02:16.301460+00:00 heroku[web.1]: State changed from starting to crashed

我的app.js是：

var http = require('http'),
    httpProxy = require('http-proxy');
//
// Create your proxy server and set the target in the options.
//
httpProxy.createProxyServer({target:'https://example.herokuapp.com/channel'}).listen(process.env.PORT); // See (†)

//
// Create your target server
//
http.createServer(function (req, res) {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.write('request successfully proxied!' + '\n' + JSON.stringify(req.headers, true, 2));
  res.end();
}).listen(process.env.PORT);

所以，我基本上要做的是，http://example.herokuapp.com上是Django app，http://example.herokuapp.com/channel指向nodejs app。有什么建议吗？

Answer 1

Error: listen EADDRINUSE错误来自于使用app.js中相同端口调用.listen（）两次。

你走在正确的轨道上。以下是如何代理/引导对Node.JS应用程序的请求以及对其他应用程序（在本例中为Django应用程序）的所有其他请求的示例：

var http = require('http'),
    httpProxy = require('http-proxy');

var NODE_PORT = 4711;

var proxy = httpProxy.createProxyServer({});

http.createServer(function(req, res) {
    // For all URLs beginning with /channel proxy to the Node.JS app, for all other URLs proxy to the Django app running on DJANGO_PORT
    if(req.url.indexOf('/channel') === 0) {
        // Depending on your application structure you can proxy to a node application running on another port, or serve content directly here
        proxy.web(req, res, { target: 'http://localhost:' + NODE_PORT });

        // Proxy WebSocket requests if needed
        proxy.on('upgrade', function(req, socket, head) {
            proxy.ws(req, socket, head, { target: 'ws://localhost:' + NODE_PORT });
        });
    } else {
        proxy.web(req, res, { target: 'http://localhost:' + process.env.DJANGO_PORT });
    }
}).listen(process.env.PORT);

// Example node application running on another port
http.createServer(function(req, res) {
    res.writeHead(200, { 'Content-Type': 'text/plain' });
    res.write('Request successfully proxied to Node.JS app');
    res.end();
}).listen(NODE_PORT);

如何在Heroku中的同一个dyno上运行Django和node.js应用程序？

1 个答案: