How do you implement traffic load distribution in systems?

Traffic load distribution in systems is implemented using load balancers, which distribute incoming requests among multiple servers or services to enhance fault tolerance and performance.

Main approaches:

• DNS Round Robin — a simple method where DNS returns different server IPs in turn.
• Hardware or software load balancers (e.g., HAProxy, Nginx, AWS ELB), which analyze traffic and distribute requests based on specified algorithms.
• Load balancing algorithms: round robin, least connections, IP hash, weighted distribution.
• Health checks — monitoring server status to avoid directing traffic to unavailable nodes.
• Sticky sessions — fixing a user's session to a single server if necessary.

Example configuration of a load balancer on Nginx:

upstream backend {
    server backend1.example.com;
    server backend2.example.com;
}

server {
    listen 80;
    location / {
        proxy_pass http://backend;
    }
}

Thus, the load is evenly distributed between backend1 and backend2.