setting up upstream with nginx and node?

Question

I have three instances on aws. one for nginx which the front-end server, and two backend nodejs intstances.

Im trying to set up the nginx server to upstream to these node.js instances:

upstream node_servers {
        server private_ip:8124 weight=10 max_fails=3; // node server 1 private_ip:port
        server private_ip:8124 weight=10 max_fails=3; // node server 2 private_ip:port
}
server {
    listen  private_ip:80;     // nginx server private ip:port
    root /home/ubuntu/project/;
    server_name public_ip.eu-west-1.compute.amazonaws.com;  // nginx public DNS
    location / {

                try_files $uri $uri/ /index.html;
                proxy_pass http://node_servers/;

     }
}

on my node 1 server, node 2 server instance app.js code:

app.listen(8124, "127.0.0.1");
console.log("listening on 8124");

I go to the nginx server public domain name, and nothing really happens, its just loads forever sending request.....

Answer 1

In your node code, you are listening on the loopback interface on 127.0.0.1 (requests from localhost only):

app.listen(8124, "127.0.0.1");

You have to listen on your specific private IP or 0.0.0.0:

app.listen(8124, "0.0.0.0");