SergObsidian/SKILLS DOCS/DOCS/Load Balancer.md

https://medium.com/@ajibudiono04/basic-configuration-load-balancer-using-debian-11-bullseye-c0da7047f426

Load Balancer is a solution to stabilize traffic in the Network. Load Balancer works by distributing traffic to ensure servers are not overloaded.

We can use a load balancer using Debian 11 (bullseye). in this example topology using 2 Web Servers.

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1. First Step, We must install OS Debian 11 as Load Balancer
2. Don’t forget to update and upgrade OS
3. Login as Super User (root)

root@loadbalancer:/home/aji# apt-get update  
root@loadbalancer:/home/aji# apt-get upgrade

4. Install HAProxy

 root@loadbalancer:/home/aji# apt-get install haproxy

5. Configure HAProxy in the file config “etc/haproxy/haproxy.cfg”

root@loadbalancer:/home/aji# nano /etc/haproxy/haproxy.cfg

6. Add Command to define Web Servers

# Define frontend  
frontend apache_front  
        # Frontend listen port - 80  
        bind *:80  
        # Set the default backend  
        default_backend    apache_backend_servers  
        # Enable send X-Forwarded-For header  
        option             forwardfor  
  
# Define backend  
backend apache_backend_servers                                               
        # Use roundrobin to balance traffic  
        balance            roundrobin  
        # Define the backend servers  
        server             backend01 192.168.77.84:80 check  
        server             backend02 192.168.77.85:80 check  

7. Restart HA Proxy

root@loadbalancer:/home/aji# systemctl restart haproxy

8. Testing for ensure working normally to access to the Load Balancer (HAProxy)

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