Nginx Load Balancing on RHEL 9

Round-robin (default)

upstream myapp {
    server 192.168.1.10:8080;
    server 192.168.1.11:8080;
    server 192.168.1.12:8080;
}
server {
    listen 80;
    server_name lb.example.com;
    location / { proxy_pass http://myapp; }
}

Least connections

upstream myapp { least_conn; server 192.168.1.10:8080; server 192.168.1.11:8080; }

IP hash (session persistence)

upstream myapp { ip_hash; server 192.168.1.10:8080; server 192.168.1.11:8080; }

Weighted

upstream myapp { server 192.168.1.10:8080 weight=3; server 192.168.1.11:8080 weight=1; }

Backup server

upstream myapp { server 192.168.1.10:8080; server 192.168.1.11:8080 backup; }

Reload

nginx -t && systemctl reload nginx 2>/dev/null || nginx -t && rcctl reload nginx