Shulou(Shulou.com)06/02 Report--

What is lvs? In view of this problem, this article introduces the corresponding analysis and answers in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible way.

LVS is the abbreviation of LinuxVirtualServer, which means Linux virtual server, which is a virtual server cluster system. This project, founded by Dr. Zhang Wensong in May 1998, is one of the earliest free software projects in China. Dr. Zhang Wensong currently works in Ali Group, mainly engaged in the research of cluster technology, operating system, object storage and database.

Purpose:

Use cluster technology and Linux operating system to achieve a high-performance, high-availability server.

Good scalability (Scalability)

Good reliability (Reliability)

Good Manageability.

Features:

Several architectures of scalable network services, all of which require a front-end load scheduler (or multiple master-slave backups). We first analyze the main technologies to implement virtual network services, and point out that IP load balancing technology is the most efficient in the implementation of load scheduler. Among the existing IP load balancing technologies, a group of servers are mainly composed of a group of servers into a high-performance and highly available virtual server through network address translation (Network Address Translation), which we call VS/NAT technology (Virtual Server via Network Address Translation). Based on the analysis of the shortcomings of VS/NAT and the asymmetry of network services, we propose two methods: VS/TUN (Virtual Server via IP Tunneling) to realize virtual server through IP tunnel and VS/DR (Virtual Server via Direct Routing) to realize virtual server through direct routing, which can greatly improve the scalability of the system. VS/NAT, VS/TUN and VS/DR are three kinds of IP load balancing technologies implemented in LVS cluster.

Advantages:

1. Open source, free

2. Some related technical resources can be found on the Internet

3. It has some advantages of software load balancing

Disadvantages:

1. The core thing is that there is no reliable support service, and no one is responsible for the results.

2. The function is relatively simple, and the load balancing ability to support complex applications is poor, such as fewer algorithms, etc.

3. To open the tunnel, you need to recompile the kernel.

4. Complex configuration

5. It is mainly used in LINUX, and there is no version specifically for WINDOWS. However, you can configure windows to become the real server in the LVS cluster (win2003, win2008).

Technology:

LVS cluster adopts IP load balancing technology and content-based request distribution technology. The scheduler has a good throughput, it transfers requests to different servers evenly, and the scheduler automatically shields the failure of the server, thus forming a group of servers into a high-performance and highly available virtual server. The structure of the whole server cluster is transparent to customers, and there is no need to modify client-side and server-side programs. For this reason, the transparency, scalability, high availability and manageability of the system need to be considered in the design.

This is the end of the answer to the question about what lvs is. I hope the above content can be of some help to you. If you still have a lot of doubts to solve, you can follow the industry information channel to learn more about it.

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