load Balancing NodeJs apps using Nginx

Make multiple nodeJs instance and access on i.p / domain

If A instance is busy then the request will go to B and B also busy then request move to C vice versa.

Steps to be follow

1.  $ sudo nano /etc/nginx/sites-available/default  # Edit nginx default file and pase below code




    upstream node_cluster {
        server 127.0.0.1:3001;  #Node.js instance 1
        server 127.0.0.1:3002;  #Node.js instance 2
        server 127.0.0.1:3003;  #Node.js instance 3
        }

    server {
        
        listen 80 default_server;
         
        server_name localhost;

        location / {
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header Host $http_host;
                proxy_set_header X-NginX-Proxy true;

                proxy_pass http://node_cluster/;
                proxy_redirect off;
        }
    }




2. $ sudo service nginx restart  # restart the nginx for reflect the changes on server
3. $ Run node server.js  # open the i.p/domain on browser refresh page multiple times port will change