Node js应用程序在本地工作正常。尝试在服务器上运行时显示错误。

ubuntu@ip-172-*-*-*:~/sample_nodejs$ node main.js
events.js:183
throw er; // Unhandled 'error' event
  ^

Error: listen EADDRNOTAVAIL 52.*.*.*:1122
at Object._errnoException (util.js:1022:11)
at _exceptionWithHostPort (util.js:1044:20)
at Server.setupListenHandle [as _listen2] (net.js:1350:19)
at listenInCluster (net.js:1408:12)
at doListen (net.js:1517:7)
at _combinedTickCallback (internal/process/next_tick.js:141:11)
at process._tickCallback (internal/process/next_tick.js:180:9)
at Function.Module.runMain (module.js:695:11)
at startup (bootstrap_node.js:188:16)
at bootstrap_node.js:609:3


这是我的端口运行状态。使用的命令netstat -tulpn

(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
PID/Program name
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN
-
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN
-
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN
-
tcp6       0      0 :::22                   :::*                    LISTEN
-
tcp6       0      0 :::80                   :::*                    LISTEN
-
udp        0      0 127.0.0.53:53           0.0.0.0:*
-
udp        0      0 172.*.*.*:68          0.0.0.0:*                           -


尝试更改iptables

sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3000


仍然显示错误。这是服务器故障还是我需要从服务器端询问权限?

这是我尝试使用公共IP地址的示例代码:

   var express = require('express');

  var app = express();

 const http = require('http');

  const hostname = '52.*.*.*';

  const port = 1122;

  const server = http.createServer((req, res) => {
    res.statusCode = 200;
    res.setHeader('Content-Type', 'text/plain');
    res.end('Hello, World!\n');
  });

  server.listen(port, hostname, () => {
   console.log(`Server running at http://${hostname}:${port}/`);
   });

最佳答案

不要尝试监听EC2实例上的外部IP地址-该地址不可用。相反,请在“ any”界面上收听(有时显示为0.0.0.0)。根据文档,我可以发现这是通过server.listen完成的,而没有指定主机参数:


  如果省略host,则服务器将接受
  unspecified IPv6 address::)(当IPv6可用时)或
  unspecified IPv4 address0.0.0.0)否则。
  
  在大多数操作系统中,收听unspecified IPv6 address
  (::)可能导致net.Server也监听unspecified IPv4 address0.0.0.0)。


尽管您必须将其暴露给安全组,但是您可以从外部访问所侦听的端口。

编辑

您需要将代码更改为:

var express = require('express');

var app = express();

const http = require('http');

const port = 1122;

const server = http.createServer((req, res) => {
    res.statusCode = 200;
    res.setHeader('Content-Type', 'text/plain');
    res.end('Hello, World!\n');
});

server.listen(port, () => {
  console.log(`Server running at on port ${port}`);
});

10-05 17:45