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Think of a host at a restaurant. The host sends guests to empty tables. This keeps one table from getting too crowded. Load balancers do this for web traffic. They send users to different servers. This keeps your site fast.
A load balancer sits between your users and your servers. It picks the right server for each request. This stops one server from crashing. It makes your app reliable.
Types of load balancers:
- Hardware: High cost, high speed.
- Software: Low cost, flexible.
- Virtual: Cloud ready.
Common algorithms:
- Round Robin: Rotates requests.
- Least Connections: Picks the least busy server.
- IP Hash: Binds users to servers.
Ways to distribute traffic:
- Geographic: Uses the closest server.
- Content: Uses the right server for the request.
- Session: Keeps a user on one server.
Common challenges:
- Single point of failure: One break stops all traffic.
- Bottlenecks: Bad settings slow things down.
- Security: DoS attacks.
Best practices:
- Choose the right tool.
- Set clear rules.
- Monitor your system.
Cloud and AI change the field. Load balancers keep your site online and safe.
Source: https://dev.to/abdullah_bajwa_2072d8a81b/how-load-balancers-distribute-traffic-534i