Several methods of load balancing

Several methods of load balancing are as follows:

(1) HTTP redirection load balancing

The advantage of this load balancing scheme is that it is relatively simple , the disadvantage is that the browser needs to request the server twice each time to complete an access, and the performance is poor.

(2) DNS domain name resolution load balancing

The advantage of DNS domain name resolution load balancing is to hand over the load balancing work to DNS, eliminating the trouble of network management. The disadvantage is that DNS may cache A records , not controlled by the website.

(3) Reverse proxy load balancing

The advantage is that it is simple to deploy, but the disadvantage is that the reverse proxy server is the transfer station for all requests and responses, and its performance may become a bottleneck.

(4) IP load balancing

The advantage is that IP load balancing completes data distribution in the kernel process, which has better processing performance than reverse proxy balancing. The disadvantage is that the load balancing network card bandwidth becomes the bottleneck of the system.

(5) Data link layer load balancing

Avoids the load balancing server network card bandwidth from becoming a bottleneck. It is currently the most widely used load balancing method for large websites.

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