These 6 ways to implement load balancing technology should not be missed

Load balancing is an application of cluster technology, which can distribute work tasks to multiple processing units, thereby improving concurrent processing capabilities and improving the performance of medium and large websites. Next, the editor will introduce 6 ways to implement load balancing technology:

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1. HTTP redirection protocol to achieve load balancing

Calculate a real web server address based on the user's http request, write the web server address into the http redirect response and return it to the browser, which will then access the browser again. This method is relatively simple, but has poor performance.

2. [Protocol layer] DNS domain name resolution load balancing

Configure multiple domain name corresponding IP records on the DNS server. This method directly assigns the load balancing work to the DNS, saving a lot of trouble for website management and maintenance, fast access speed, and effectively improving performance.

3. [Protocol layer] Reverse proxy load balancing

While providing load balancing function, the reverse proxy server manages a group of web servers and forwards the requested browser access to different web servers for processing according to the load balancing algorithm. The processing results are returned to the browser through the reverse server. This method is simple to deploy, but the web server address cannot be directly exposed to the outside world, and there is no need to use an external IP address. As a communication bridge, the reverse proxy service needs to be configured with dual network cards and two sets of external and internal IP addresses.

4. [Network layer] IP load balancing

Load balancing is performed by modifying the target address at the network layer. This method is faster than reverse server load balancing in responding to requests, but when the request data is large (large videos or files), the response speed will be slower.

5. [Link layer] Data link layer load balancing

Modify the Mac address at the data link layer for load balancing, and the IP of the load balancing server is consistent with the virtual IP of the web service group it manages. It does not require the load balancing server to convert the address, but it has higher requirements on the network card bandwidth of the load balancing server.

6. F5

The full name of F5 is F5-BIG-IP-GTM, which is the most advanced hardware load balancing device with the highest concurrent capacity. This method can achieve load balancing and redundancy of multiple links, and can access multiple ISP links to achieve load balancing and high availability between links.