Load Balancing

Distribute traffic across application servers.

nginx Load Balancer

upstream backend { least_conn; server backend1:8080 weight=3; server backend2:8080; server backend3:8080 backup; }

server { listen 80;

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

}

HAProxy

frontend http_front bind *:80 default_backend http_back

backend http_back balance roundrobin option httpchk GET /health server web1 10.0.0.1:8080 check server web2 10.0.0.2:8080 check

AWS ALB

aws elbv2 create-load-balancer
--name my-alb
--subnets subnet-xxx subnet-yyy
--security-groups sg-xxx
--type application

Best Practices

• Implement health checks

• Use sticky sessions when needed

• Enable connection draining

• Monitor backend health