Home > HOWTOs > NGINX – Load Balancing Web Servers.

NGINX – Load Balancing Web Servers.

Setting up NGINX for HTTP load balancing.
Nginx server is running as below.
nginx-server : nginx.server.com //nginx
Below are the 3 server which run a web application which needs to be load balanced.
Server1 : node1.application.com //web_server
Server2 : node2.application.com //web_server
Server3 : node3.application.com //web_server
Install NGINX on RHEL/Centos6
Step 1 : Create a Repo. in [vim /etc/yum.repos.d/nginx.repo]
CENTOS6
[nginx]
name=nginx repo
gpgcheck=0
enabled=1

RHEL:
[nginx]
name=nginx repo
gpgcheck=0
enabled=1
Step 2 : Installation 
[ahmed@ngnix ~]$ sudo yum install nginx
Step 3 : Configuration: sudo vim /etc/nginx/nginx.conf
#——BEGIN CONFIG————
user  nginx;
worker_processes  1;
error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;

events {
    worker_connections  1024;
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  ‘$remote_addr – $remote_user [$time_local] “$request” ‘
                      ‘$status $body_bytes_sent “$http_referer” ‘
                      ‘”$http_user_agent” “$http_x_forwarded_for”‘;

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;
    keepalive_timeout  65;
    #gzip  on;
    #include /etc/nginx/conf.d/*.conf;
    
    upstream myappredirect 
    {
        server node1.application.com;
        server node2.application.com;
        server node3.application.com;
    }
    server 
    {
    listen 80;
        location / {
            proxy_pass http://myappredirect;
        }    
    }
}
#——END CONFIG———–
Now we are ready for testing.
[ahmed@ngnix ~]$ sudo service nginx start
Now we can go the browser and hit the IP address of nginx server.
As per the current setup (Default) it will do a Round-Robin to send request to the servers.
“All inbound request to NGINX[nginx.server.com]” -> NGINX will load_balance and distribute traffic to Servers.
–>[NGINX]—->[HOST1]
  \–>[HOST2]
  \–>[HOST3]
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