Deploy NGINX as an ELB

Install NGINX using below given steps

BASH

# For RHEL
yum install nginx -y

# For Ubuntu
apt update 
apt install nginx -y

Move existing nginx.conf to a backup file and create a new one for the below mentioned configurations.
BASH
```
sudo mv /etc/nginx/nginx.conf /etc/nginx/nginx.conf.bak
sudo vim /etc/nginx/nginx.conf
```

Copy the following configurations in the blank nginx.conf file. Replace the WORKER_NODE and CP_NODE with appropriate values.

BASH

user nginx;
worker_processes 4;
worker_rlimit_nofile 40000;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 8192;
}

stream {
upstream backend {
        least_conn;
        server CP_NODE_1:9345 max_fails=3 fail_timeout=5s;
        server CP_NODE_2:9345 max_fails=3 fail_timeout=5s;
        server CP_NODE_3:9345 max_fails=3 fail_timeout=5s;
   }

   # This server accepts all traffic to port 9345 and passes it to the upstream. 
   # Notice that the upstream name and the proxy_pass need to match.
server {
      listen 9345;
          proxy_pass backend;
   }
upstream ef_cx_api {
        least_conn;
        server CP_NODE_1:6443 max_fails=3 fail_timeout=5s;
        server CP_NODE_2:6443 max_fails=3 fail_timeout=5s;
        server CP_NODE_3:6443 max_fails=3 fail_timeout=5s;
    }
server {
        listen     6443;
        proxy_pass ef_cx_api;
        }
upstream ef_cx_http {
        least_conn;
        server WORKER_NODE_1:80 max_fails=3 fail_timeout=5s;
        server WORKER_NODE_2:80 max_fails=3 fail_timeout=5s;
        server WORKER_NODE_1:80 max_fails=3 fail_timeout=5s;
    }
server {
        listen     80;
        proxy_pass ef_cx_http;
        }
upstream ef_cx_https {
        least_conn;
        server WORKER_NODE_1:443 max_fails=3 fail_timeout=5s;
        server WORKER_NODE_2:443 max_fails=3 fail_timeout=5s;
        server WORKER_NODE_3:443 max_fails=3 fail_timeout=5s;
    }
server {
        listen     443;
        proxy_pass ef_cx_https;
        }
}

Start the nginx service

CODE

systemctl enable --now nginx