NGINX basic Load Balancer examples

[DerMeldos]

sudo vim /etc/nginx/sites-available/lb_example.conf

Round Robin config example:

upstream mywebservers {
	server 1.2.3.4;
	server 5.6.7.8;
}

	server {
		listen 80;
		location / {
			proxy_pass http://mywebservers;
		}
	}

To make it balance it to the least busy server:

upstream mywebservers {
	least_conn;
	server 1.2.3.4;
	server 5.6.7.8;
}

	server {
		listen 80;
		location / {
			proxy_pass http://mywebservers;
		}
	}

To priorities server, you can use weights:
- default weight is 1

upstream mywebservers {
	least_conn;
	server 1.2.3.4 weight=3;
	server 5.6.7.8;
}

	server {
		listen 80;
		location / {
			proxy_pass http://mywebservers;
		}
	}

Conf Example Including non-active backup:

upstream mywebservers {
	least_conn;
	server 1.2.3.4 weight=3;
	server 5.6.7.8;
	server 10.20.30.40 backup;
}

	server {
		listen 80;
		location / {
			proxy_pass http://mywebservers;
		}
	}

Conf Example for different Listening Ports of Servers:

upstream mywebservers {
	least_conn;
	server 1.2.3.4:8081 weight=3;
	server 5.6.7.8;
	server 10.20.30.40:8080 backup;
}

	server {
		listen 80;
		location / {
			proxy_pass http://mywebservers;
		}
	}