What is Load balancing ? | What are Load Balancers ? | TecH FiberNeT
Tamil What is Load balancing ? | What are Load Balancers ? | InterviewDOT
Load balancing is a commonly used term when it comes to hosting. A load balancer serves as a load balancer in a server infrastructure. The response time and the load on individual servers are assessed and the performance of the servers is increased by appropriate load balancing.
The load balancer is connected upstream of the servers and distributes the requests so that no server is overloaded. Even if a single server fails, the load balancer intervenes and redirects the requests to the remaining servers.
The load balancer thus increases the availability and performance of the web server. In addition, a load balancer ensures cross-location fault tolerance, simplifies the configuration of a server cluster and improves the scalability of the available resources and the communication between the servers.
Different types of load balancing
Load balancing solutions can be implemented using special hardware or software. Depending on the project and requirements, one or the other variant offers more advantages. A layer 4/7 switch is often used as the hardware load balancer.
Load balancing: from round robin to least response time
Different methods are used for load balancing. The simplest of these procedures is Round Robin. In this round-robin procedure, the servers are checked one after the other for their utilization and the first underutilized server receives the request. In the dynamic least-connection process, the request is assigned to the server that currently serves the fewest connections. There is also the weighted distribution process, in which the servers are weighted according to their performance. With the least response time method, the server with the shortest response time is selected.
Load balancing refers to efficiently distributing incoming network traffic across a group of backend servers, also known as a server farm or server pool.
Modern high‑traffic websites must serve hundreds of thousands, if not millions, of concurrent requests from users or clients and return the correct text, images, video, or application data, all in a fast and reliable manner. To cost‑effectively scale to meet these high volumes, modern computing best practice generally requires adding more servers.
A load balancer acts as the “traffic cop” sitting in front of your servers and routing client requests across all servers capable of fulfilling those requests in a manner that maximizes speed and capacity utilization and ensures that no one server is overworked, which could degrade performance. If a single server goes down, the load balancer redirects traffic to the remaining online servers. When a new server is added to the server group, the load balancer automatically starts to send requests to it.
In this manner, a load balancer performs the following functions:
Distributes client requests or network load efficiently across multiple servers
Ensures high availability and reliability by sending requests only to servers that are online
Provides the flexibility to add or subtract servers as demand dictates
Round Robin (sometimes called "Next in Loop").
Weighted Round Robin -- as Round Robin, but some servers get a larger share of the overall traffic.
Random.
Source IP hash. Connections are distributed to backend servers based on the source IP address. If a webnode fails and is taken out of service the distribution changes. As long as all servers are running a given client IP address will always go to the same web server.
URL hash. Much like source IP hash, except hashing is done on the URL of the request. Useful when load balancing in front of proxy caches, as requests for a given object will always go to just one backend cache. This avoids cache duplication, having the same object stored in several / all caches, and increases effective capacity of the backend caches.
Least connections, weighted least connections. The load balancer monitors the number of open connections for each server, and sends to the least busy server.
Least traffic, weighted least traffic. The load balancer monitors the bitrate from each server, and sends to the server that has the least outgoing traffic.
Least latency. Perlbal makes a quick HTTP OPTIONS request to backend servers, and sends the request to the first server to answer.
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