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IP Virtual Server

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IPVS (IP Virtual Server) implements transport-layer load balancing inside the Linux kernel, so called Layer-4 LAN switching. IPVS is incorporated into Linux Virtual Server, where it runs on a host and acts as a load balancer at the front of a cluster of real servers, it can direct requests for TCP/UDP based services to the real servers, and makes services of the real servers appear as a virtual service on a single IP address.