System Design — Load Balancing

Concepts and considerations for Load Balancing in System Design

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Table of Contents

1. Concept
2. How does it work
3. Type of Load Balancers
4. Load Balancer locations
5. Algorithms
6. Implementation
7. Other

1. Concepts

A load balancer is a device that acts as a reverse proxy and distributes network or application traffic across a number of servers. It helps scale horizontally across an ever-increasing number of servers.

2. How does the load balancer work?

• Define IP or DNS name for LB: Administrators define one IP address and/or DNS name for a given application, task, or website, to which all requests will come. This IP address or DNS name is the load balancing server.
• Add backend pool for LB: The administrator will then enter into the load balancing server the IP addresses of all the actual servers that will be sharing the workload for a given application or task. This pool of available…