Linux virtual server provides load harmonizing solution for Linux systems; it utilizes clustering technology to offer elevated presentation.

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Linux Virtual Server itself functions on Linux, however it can still balance load from clients using any operating systems to real servers running on any other operating system as long as those connections use Transmission Control Protocol or User Datagram Protocol. Linux virtual server is built on group of real servers with load balance using Linux OS. This clustering or grouping of real servers provides good scalability, consistency and serviceability.


Few of the Linux virtual server solutions proposed are:

• IPVS: it is software for Internet Protocol load balancing which is implemented inside Linux heart or kernel.

• KTCPVS: it implements load balancing at application-level inside Linux heart or kernel.


Applications of Linux Virtual Server:

Linux Virtual Server using Layer 4 switching can be used for numerous network services such as Scalable web, Caching, Mail, ftp, VOIP and media services


Layer 4 Switching

In layer 4 switching process, the Linux Director decides as to which real server should get the packets. Forwarding packets to a real server is done in three different ways:


Network Address Translation (NAT): It is a technique to manipulate address, destination and/or source port of the packet.


Direct Routing: Real server directly receives packets from end users.


IP-IP Encapsulation: A different network receives redirected packets from another IP address.


Linux virtual Server NAT has simple configuration of LVS, here the packets from real servers will be acknowledged by Linux director and target IP address will be rephrased to any of the real servers. Real server return packets will change their source IP address.


Real Servers: They ensure safe routing of return packets via Linux Director. It also makes sure that port 80 will handle all connections from the clients or end users.

 

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