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nginx_loadb/index.md

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+# NGINX Load Balancing 
+
+First off you will need a debian10 server to run nginx as a load balancer, and 2 other http servers.
+
+## **Initial Setup**
+
+First we're go install nginx:
+    
+    
+    apt update -y && apt upgrade -y
+    apt install nginx -y
+    	
+    
+
+Then you will need 2 http servers (mine are 192.168.0.150:80 and 192.168.0.151:80):
+
+![](1.png)
+
+Then make the configuration to load balance the 2 servers:
+    
+    
+    nano /etc/nginx/sites-available/loadb.conf
+    
+    
+    
+    
+    upstream backend {
+            server 192.168.0.150:80 weight=1;
+            server 192.168.0.151:80 weight=2;
+    
+    }
+    server {
+            listen 80;
+            listen [::]:80;
+            location / {
+                    proxy_pass http://backend;
+            }
+    }
+    
+
+Hit CTRL+S to save and CTRL+X to exit nano.
+
+## **Launching the config**
+
+Now remove the default config and launch reload nginx:
+    
+    
+    
+    rm /etc/nginx/sites-available/default
+    rm /etc/nginx/sites-enabled/default
+    
+    ln -s /etc/nginx/sites-available/loadb.conf /etc/nginx/sites-enabled/loadb.conf
+    nginx -s reload
+    
+    
+
+![](2.png)
+
+And test if it load balances well. It should give us the output of the .151 server because it has the highest weight: 
+
+![](3.png)
+
+As you can see, nginx determines the number of allowed requests to each load balanced website with the weight parameter, for instance, our .151 server has a weight of 2, so nginx will allow us 2 requests before switching back to the .150 server. 
+
+This is also possible with other ports like database servers:
+    
+    
+    upstream sqlbackend {
+            server 192.168.0.150:3386 weight=1;
+            server 192.168.0.151:3386 weight=2;
+    
+    }
+    server {
+            listen 3386;
+            listen [::]:3386;
+            location / {
+                    proxy_pass sqlbackend;
+            }
+    }
+    	
+    
+
+It is also possible to do with UDP:
+    
+    
+    stream {
+    upstream ntp {
+            server 192.168.0.150:123 weight=2;
+            server 192.168.0.151:123 weight=3;
+    
+    }
+    server {
+            listen 123 udp;
+            listen [::]:123 udp;
+            location / {
+                    proxy_pass ntp;
+            }
+    }
+    }
+    
+
+Here you can see how flexible nginx truly is, it can handle load balancing of multiple types of services, apply weights parameters over tcp/udp services. 
+