What is Server Load Balancing and how much does it cost to rent one?

What is Server Load Balancing and how much does it cost to rent one?

Maybe some friends don't understand what server load balancing is? Server load balancing is a network-specific term, also known as load sharing, which refers to the dynamic adjustment of the load conditions in the system to eliminate or reduce the load imbalance of each node in the system. Next, the editor will explain what server load balancing is and why you would do it.

What does server load balancing mean?

Server load balancing is a group of servers composed of multiple servers symmetrically. Each server has equal status and can serve independently without assistance from other servers.

Through some kind of load management technology, external requests are evenly distributed to the servers in a symmetrical structure, and the servers that receive the requests respond to the client's requests on their own. Server load balancing can evenly distribute user requests to the server array, allowing important data to be quickly obtained, thus solving many concurrent access efficiency issues. This cluster technology can achieve near-mainframe performance at minimal cost.

Load balancing is based on the existing network structure. It provides a cheap, effective and transparent way to expand the bandwidth of network devices and servers, improve throughput, enhance network data processing capabilities, and improve network flexibility and availability.

There are two types of server load balancing:

1. Load balancing based on DNS

Load balancing is accomplished by resolving names randomly in the DNS effect, where multiple different addresses are considered to be configured with the same name, and ultimately a client querying a name will get one of the addresses when resolving the name. Therefore, for the same name, different clients get different addresses at different times, and they also access the web server at different addresses, thus achieving the purpose of load balancing.

2. Reaction Load Balancing

The application of the proxy server can forward the request to the internal web server, so that the proxy server can evenly forward the request to one of the internal web servers, thereby achieving the purpose of load balancing. This mode of action is different from the general mode of action. The standard proxy method is that clients use proxies to access multiple external web servers. This proxy method is that multiple clients use proxies to access internal web servers, so it is also called the reverse proxy method.

What is Server Load Balancing?

Why do we need load balancing? Load balancing has the following advantages:

one. Highly intelligent

Virtual IP (VIP) addresses are used to represent policy servers and applications, assign sessions to the server with the highest availability, monitor each session throughout, automatically re-register when availability is restored, and provide complete address changes when forwarding client and server packets. Simple and practical load balancing algorithm can configure a variety of different load balancing methods, such as round-robin, least connection, hashing or least error. It can also configure the maximum connection number threshold and weight value for a single server to prevent server overload.

2. High reliability

The backbone network is built on a dedicated high-speed backbone network, providing network connection with minimal latency, ensuring the normal function and high performance of GSLB, which is far superior to the public network GSLB. In addition, when the Internet exit of the main site computer room fails, users can be automatically and transparently directed to the main site server from the Internet entrance of other sub-sites.

3. High Availability

Select the hot backup mode to detect and transmit server links, switch ports and switches in a very short time, so that the application is not affected by failures; if any server or server group fails or is blocked, it will automatically guide users to the next best backup server or site, further improving the effectiveness and availability of the content.

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