Shulou(Shulou.com)06/01 Report--

This article will explain in detail the use of load balancing for you. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Load balancing (Load Balance)

At present, with the increase of business volume and the rapid growth of access volume and data traffic, the processing capacity and computing strength of each core part of the existing network also increase accordingly, which makes a single server equipment impossible to bear. In this case, if we throw away the existing equipment to do a large number of hardware upgrades, it will result in a waste of existing resources, and if we face the next increase in business volume, it will lead to another high cost of hardware upgrading. even the equipment with excellent performance can not meet the demand of the current business growth.

Classification of load balancing implementation methods

1: software load balancing technology

This technology is suitable for some small and medium-sized website systems and can meet the general load balancing needs. Software load balancing technology is a load balancing technology that installs one or more corresponding load balancing software on multiple servers in one or more interactive network systems. The software can be easily installed on the server and achieve a certain load balancing function. Software load balancing technology is simple to configure, easy to operate, and the most important thing is that the cost is very low.

2: hardware load balancing technology

As the hardware load balancing technology requires additional load balancer, the cost is relatively high, so it is suitable for large-scale website systems with high traffic. However, in today's larger corporate networks and government websites, hardware load balancing devices are generally deployed (reason 1. The hardware is more stable, 2. Hardware load balancing technology is to install corresponding load balancing equipment, that is, load balancer, among multiple servers to complete load balancing technology. Compared with software load balancing technology, hardware load balancing technology can achieve better load balancing effect.

3: local load balancing technology

The local load balancing technology is to balance the load of the local server group. This technology optimizes the performance of the server so that the traffic can be evenly distributed among the servers in the server farm, and the local load balancing technology does not need to buy expensive servers or optimize the existing network structure.

(for example, Microsoft NLB network load balancing technology, which implements load balancing through applications on multiple servers, the principle is that several servers virtualize an IP address, and the application will make the server cycle response data, but there are problems encountered in the deployment of a security gateway. You can pay attention to this experience later, and the problem is briefly described as follows: when external test PC After a ping packet is sent to the virtual IP address, the virtual IP responds to a packet, and the real host also responds to the packet, causing the security device to think that the session is not secure. Therefore, it is blocked, resulting in abnormal business. )

4: global load balancing technology (also known as WAN load balancing)

Global load balancing technology is suitable for large website systems with multiple server clusters. Global load balancing technology is to balance the load of multiple servers distributed in various regions of the country. This technology can automatically turn to the nearest point of the region by determining the IP geographical location of the visiting users. This technology is used by many large websites.

5: link set load balancing technology

Link set load balancing technology uses multiple physical links in the network system as a single aggregation logical link, so that the data traffic in the website system is shared by all the physical links in the aggregation logical link. This technology can greatly improve the network data throughput and save the cost without changing the existing line structure and increasing the existing bandwidth.

Summary:

There are at least four applications for load balancer:

Server load balancing

Load balancing of wide area network servers

Firewall load balancing

Transparent website accelerator load balancing.

Server load balancing is responsible for distributing the tasks requested by customers to multiple servers to expand the service capacity and exceed the processing capacity of one server, and to make the application system fault-tolerant.

The wide area network server load balancing is responsible for directing customer requests to server farms in different data centers in order to provide customers with faster response and intelligent redundancy in the event of a catastrophic accident in a data center.

Firewall load balancer distributes the request load to multiple firewalls to improve security performance so as to exceed the processing capacity of one firewall.

Transparent website Accelerator (Transparent cache) exchanges directed traffic to multiple website accelerators, which is used to unload the static content of the website server to the website Accelerator (Cache), so as to improve the performance of website services and accelerate the response time of cache.

This is the end of this article on "what's the use of load balancing". I hope the above content can be helpful to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.