Top 6 Use Cases for Load Balancers

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Load balancers are critical for modern IT infrastructure, ensuring high availability, scalability, and security. Below are the key use cases with practical implementations.

🔷 SSL Termination

Offloads decryption from backend servers, simplifying secure connections.

You Should Know:

To configure SSL termination in Nginx:

server { 
listen 443 ssl; 
server_name example.com; 
ssl_certificate /etc/nginx/ssl/example.crt; 
ssl_certificate_key /etc/nginx/ssl/example.key; 
location / { 
proxy_pass http://backend_servers; 
} 
}

For HAProxy:

frontend https_in 
bind :443 ssl crt /etc/haproxy/cert.pem 
default_backend backend_servers

🔷 Scalability

Distributes traffic evenly so you can add or remove servers as needed.

You Should Know:

Using AWS Elastic Load Balancer (ELB):

aws elb create-load-balancer --load-balancer-name my-load-balancer \ 
--listeners "Protocol=HTTP,LoadBalancerPort=80,InstanceProtocol=HTTP,InstancePort=80" \ 
--subnets subnet-12345678

🔷 Health Monitoring

Checks server status in real time and routes traffic only to healthy servers.

You Should Know:

HAProxy health check configuration:

backend backend_servers 
balance roundrobin 
server server1 192.168.1.1:80 check 
server server2 192.168.1.2:80 check

🔷 High Availability

Ensures your app stays online, even if individual servers fail.

You Should Know:

Keepalived for failover (Linux):

vrrp_instance VI_1 { 
state MASTER 
interface eth0 
virtual_router_id 51 
priority 100 
advert_int 1 
virtual_ipaddress { 
192.168.1.100 
} 
}

🔷 Session Persistence

Keeps user sessions on the same server for a consistent experience.

You Should Know:

Nginx sticky sessions:

upstream backend { 
ip_hash; 
server 192.168.1.1; 
server 192.168.1.2; 
}

🔷 Traffic Distribution

Balances user requests across multiple servers for optimal performance.

You Should Know:

Linux IPVS (IP Virtual Server):

ipvsadm -A -t 192.168.1.100:80 -s rr 
ipvsadm -a -t 192.168.1.100:80 -r 192.168.1.1 -m 
ipvsadm -a -t 192.168.1.100:80 -r 192.168.1.2 -m

What Undercode Say

Load balancers are indispensable in modern IT infrastructure. Whether using Nginx, HAProxy, AWS ELB, or Linux IPVS, implementing proper load balancing ensures scalability, security, and high availability. Automation with Keepalived, health checks, and session persistence enhances resilience.

Expected Output:

  • Properly configured load balancer distributing traffic.
  • SSL termination reducing backend overhead.
  • Automated failover ensuring zero downtime.

Prediction:

As cloud-native applications grow, AI-driven auto-scaling load balancers will dominate, dynamically adjusting resources based on real-time traffic patterns.

Relevant URLs:

References:

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