Nginx lbr

Here's how you can configure the LBR (load balancer) server with NGINX as a reverse proxy using HTTP load balancing to your app servers, while preserving the existing Apache configurations on those backend nodes:

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Step 1: Install NGINX on the LBR Server

sudo yum install nginx -y        # For RHEL/CentOS
# Or for Debian/Ubuntu:
sudo apt install nginx -y
sudo systemctl enable nginx
sudo systemctl start nginx

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Step 2: Configure Load Balancing in NGINX

Let’s assume your app servers are running Apache on port 8080, and their IPs are 192.168.1.10, 192.168.1.11, and 192.168.1.12. Replace them with actual IPs or hostnames.

Edit the NGINX configuration:

sudo vi /etc/nginx/nginx.conf

Add the following config:

upstream app_cluster {
    server 192.168.1.10:8080;
    server 192.168.1.11:8080;
    server 192.168.1.12:8080;
}

server {
    listen 80;
    server_name staticapp.nautilus.com;  # Or use "_"

    location / {
        proxy_pass http://app_cluster;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }
}

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Step 3: Test Apache on App Servers

Make sure Apache is listening on the intended port and is running:

systemctl status httpd    # Or apache2
netstat -tulnp | grep 8080

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Step 4: Restart NGINX

sudo nginx -t && sudo systemctl reload nginx

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Step 5: Verify the Setup

You can now test the load balancer using:

curl http://<lbr-ip>/

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If you'd like to add SSL/TLS or configure sticky sessions or health checks, I can help with that next. You're almost at the finish line of your high availability deployment! 🚀