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This article mainly explains "what are the ways to achieve load balancing technology in web". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "what are the ways to achieve load balancing technology in web?"

Load balancing (Load Balance) is an application of cluster technology (Cluster), which can allocate tasks to multiple processing units, so as to improve the concurrent processing ability and improve the performance of medium and large websites.

Load balancing based on http Redirection Protocol

According to the user's http request, a real web server address is calculated, and the web server address is written into the http redirection response and returned to the browser, which is revisited by the browser. This method is relatively simple, but the performance is poor.

[protocol layer] dns domain name resolution load balancing

Configure records of multiple domain names corresponding to IP on the DNS server. This method directly hands over the work of load balancing to DNS, which saves a lot of trouble for website management and maintenance, has fast access speed, and effectively improves performance.

[protocol layer] reverse proxy load balancing

While providing load balancing function, the reverse proxy server manages a group of web servers. According to the load balancing algorithm, the requested browser access is forwarded to different web servers for processing, and the processing results are returned to the browser through the reverse server. This method is simple to deploy, but the web server address can not be directly exposed, and there is no need to use external IP address. As a communication bridge, reverse proxy service needs to configure two network cards and two sets of external and internal IP addresses.

[network layer] IP load balancing

Load balancing is carried out at the network layer by modifying the destination address. This method is faster than reverse server load balancing in response to requests, but slows down when the request data is large (large videos or files).

[link layer] data link layer load balancing

The Mac address is modified in the data link layer for load balancing, and the IP of the load balancing server is the same as the virtual IP of the web service group it manages. It does not need the address translation of the load balancing server, but it requires high bandwidth of the network card of the load balancing server.

F5

F5, whose full name is F5-BIG-IP-GTM, is a * hardware load balancer device with concurrency capability of *. This method can achieve load balancing and redundancy of multiple links, can access multiple ISP links, and achieve load balancing and high availability between links.

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