Cloud load balancing refers to the distribution of client requests to multiple application servers running in the cloud environment. Like other types of load balancing, cloud load balancing can also maximize application performance and reliability. Compared with traditional load balancing of local resources, cloud load balancing can expand or contract applications based on demand at a lower cost.

Previous load balancing solutions utilized dedicated hardware in the data center with a dedicated technical team to install, tune, and maintain the system. At the time, this application was only suitable for large budget enterprises. With the development of cloud computing, the drawback of hardware-based solutions is that they cannot meet cloud load balancing, and cloud infrastructure vendors generally do not allow the use of user hardware or proprietary hardware in their environment.

Today's cloud load balancing greatly shows the advantages of the scalability and global nature of the cloud itself. With the convenience and speed of cloud scaling, enterprises can easily handle traffic spikes while maintaining performance by simply placing a cloud load balancer in front of a set of application instances that can scale automatically according to the data.

Cloud load balancers are used in multiple cloud center hosting around the world, greatly improving reliability. If there is a power outage in the northeastern United States after a snowstorm threatens, the cloud load balancer can direct traffic from cloud resources hosted at that address to resources hosted in other regions. Ensure uninterrupted use of the cloud server.

At present, the acceptance of cloud server products is getting higher and higher, and various types of applications are carried out in cloud servers. For example, many enterprises use cloud-based CRM to store user information. Use cloud-based ERP systems to track product data, use web hosting services to host websites, use cloud servers to run a small number of custom applications, and so on.

Now the load balancer server and the load balancing resources are deployed in the same environment to achieve better resource utilization, such as most of the enterprise computing infrastructure is hosted on the cloud, the use of load balancer in the cloud is very necessary.

In cloud computing, load balancing works between back-end servers and client devices. After receiving the request, the load balancer distributes the request to the available servers through an algorithm that takes into account various conditions, such as geographical distance and server load. In a cloud computing environment, algorithms are often used: static and dynamic to distribute traffic to achieve load balancing.

In today's cloud computing, cloud load balancing can be divided into four categories. Application, load balancer checks the content of the request and redirects traffic accordingly; Network, load balancing technology redirects traffic to the best resources based on IP addresses and other network information; Global server, load balancer selects the nearest destination based on the physical distance from the client when redirecting traffic, thus minimizing latency; DNS, a load balancer that configures a domain to route network requests between a set of resources within the domain.