服务器上的 MEAN 应用程序崩溃

Question

I try to run a MEAN App on an Nginx server, but it always crashes after:

// port is 8080
app.listen(port, (data) => {
  console.log('Listening on port ' + port + ' in ' + process.env.NODE_ENV + ' mode');
});

My firewall's status is

Status: active
To                         Action      From
--                         ------      ----
OpenSSH                    ALLOW       Anywhere  
Nginx Full                 ALLOW       Anywhere   
8080                       ALLOW       Anywhere  
OpenSSH (v6)               ALLOW       Anywhere (v6) 
Nginx Full (v6)            ALLOW       Anywhere (v6)             
8080 (v6)                  ALLOW       Anywhere (v6)  

Error

listen EADDRINUSE :::8080

I've used this tutorial to setup the server.

Seems like 8080 is already in use, but how can I find out what it's used for and fix it?

Answer 1

Since you mentioned you followed the tutorial

https://www.digitalocean.com/community/tutorials/how-to-set-up-a-node-js-application-for-production-on-ubuntu-16-04

This indicates you ran PM2 which is relaunching node even when you kill it. So you need to stop PM2

sudo pkill PM2

Then you will be able to launch your node program normally

Answer 2

To try getting what process is listening to a port enter:

sudo netstat -tulpn | grep :8080

That should hopefully give you what is using that port.

To then kill a process by PID, just use

sudo kill pid

fromhttps://www.cyberciti.biz/faq/what-process-has-open-linux-port/

An alternative way is to just use sudo fuser -k 8080/tcp to kill processes on port 8080 on TCP directly.