System Design : Load Balancing | How Load Balancers work

Features of Load Balancer:

• Distribute load/requests across multiple resources/servers.
• Keep track of status of all resources while distributing requests. If a server is down, it stops sending traffic to that server. [depending on activeness of the server]
• Ease of use in adding/removing servers in network based on demand.

Algorithms used for Load Balancing:

1. Round Robin
2. Least Connections
3. Least Response Time
4. IP Hash
5. URL Hash


Where can we use Load Balancers?

• User Requests -- [Load Balancer] -- Web Server
• Web Server --  [Load Balancer] -- Backend Server
• Internal Server -- [Load Balancer] -- Databases

Detailed explanation can be viewed on Knowledge Center's Youtube channel:

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