How to configure Nginx for NodeJS application load balancing

Load balancing can allocate user requests to multiple servers for processing, thereby achieving access support for a large number of users. The load balancing architecture is shown in the figure:

For complex web applications, using nginx for front-end load balancing is a matter of course.
Below, we use nginx for load balancing of nodejs applications.
1. Configure nginx
Modify nginx.conf:

upstream sample { 
     server 127.0.0.1:3000; 
     server 127.0.0.1:3001; 
     keepalive 64; 
    } 
     server { 
      listen 80; 
      .... 
      server_name 127.0.0.1; 
      .... 
      location / { 
        proxy_redirect off; 
        proxy_set_header x-real-ip $remote_addr; 
        proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for; 
        proxy_set_header x-forwarded-proto $scheme; 
        proxy_set_header host $http_host; 
        proxy_set_header x-nginx-proxy true; 
        proxy_set_header connection ""; 
        proxy_http_version 1.1; 
        proxy_pass http://sample; 
      } 
    }

There is a node.js server on port 3000 and port 3001. These two servers are doing the same thing. work. In the upstream section, two node.js servers are configured. In addition, we also set proxy_pass as an http request proxy.

2. Build nodejs server

var http = require('http'); 
var morgan    = require('morgan'); 
 
var server1 = http.createserver(function (req, res) { 
 console.log("request for: " + req.url + "-- port 3000 "); 
 res.writehead(200, {'content-type': 'text/plain'}); 
 res.end('hello node.js\n'); 
}).listen(3000, "127.0.0.1"); 
 
var server2 = http.createserver(function (req, res) { 
 console.log("request for: " + req.url + "-- port 3001 "); 
 res.writehead(200, {'content-type': 'text/plain'}); 
 res.end('hello node.js\n'); 
}).listen(3001, "127.0.0.1"); 
 
server1.once('listening', function() { 
 console.log('server running at http://127.0.0.1:3000/'); 
}); 
 
server2.once('listening', function() { 
 console.log('server running at http://127.0.0.1:3001/'); 
});

3. Access nginx server

Now we can access
You can see to the following output:

server running at http://127.0.0.1:3000/ 
server running at http://127.0.0.1:3001/ 
request for: /-- port 3001  
request for: /favicon.ico-- port 3000  
request for: /favicon.ico-- port 3001  
request for: /-- port 3000  
request for: /favicon.ico-- port 3001  
request for: /favicon.ico-- port 3000  
request for: /-- port 3001  
request for: /favicon.ico-- port 3000  
request for: /favicon.ico-- port 3001  
request for: /-- port 3000  
request for: /favicon.ico-- port 3001  
request for: /favicon.ico-- port 3000

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