Creating Load Balancer on Nginx Server

Creating a Load Balancer on Nginx Server. The following codes show how to create a load balancer on Nginx Server. Round Robin Load Balancer, IP Hash Load Balancer, Last Connections Load Balancer, Weighted Round Robin Load Balancer

Load Balancer Using Round Robin Algorithms:

upstream roundrobin {
        server 192.168.33.12:7000;
        server 192.168.33.12:7001;
        server 192.168.33.12:7002;
}

Load Balancer Using Last Connections Algorithms:

upstream leastconn {
        least_conn;
        server 192.168.33.12:7000;
        server 192.168.33.12:7001;
        server 192.168.33.12:7002;
}
u

Load Balancer Using IP Hash Algorithms:

upstream iphash {
        ip_hash;
        server 192.168.33.12:7000;
        server 192.168.33.12:7001;
        server 192.168.33.12:7002;
}

Load Balancer Using Weighted Round Robin Algorithms:

upstream weighted {
        server 192.168.33.12:7000 weight=2;
        server 192.168.33.12:7001;
        server 192.168.33.12:7002;
}

Create new virtual configuration file:

vim /etc/nginx/conf.d/load_balancer.conf

Add the following codes to laod_balancer.conf file:

upstream app_server_7000 {
        server 192.168.33.12:7000;
}

upstream app_server_80 {
        server 192.168.33.12:80;
}
upstream roundrobin {
        server 192.168.33.12:7000;
        server 192.168.33.12:7001;
        server 192.168.33.12:7002;
}
upstream leastconn {
        least_conn;
        server 192.168.33.12:7000;
        server 192.168.33.12:7001;
        server 192.168.33.12:7002;
}
upstream iphash {
        ip_hash;
        server 192.168.33.12:7000;
        server 192.168.33.12:7001;
        server 192.168.33.12:7002;
}
upstream weighted {
        server 192.168.33.12:7000 weight=2;
        server 192.168.33.12:7001;
        server 192.168.33.12:7002;
}

server {
        listen 8181;
        location / {
                proxy_pass http://app_server_80/;
        }
        location /proxy {
                proxy_pass http://app_server_7000/;
        }

        location /roundrobin {
                proxy_pass http://roundrobin/;
        }
        location /leastconn {
                proxy_pass http://leastconn/;
        }
        location /iphash {
                proxy_pass http://iphash/;
        }
        location /weighted {
                proxy_pass http://weighted/;
        }
}