lvsadm介绍

1. DESCRIPTION

Ipvsadm is  used to set up, maintain or inspect 
the virtual server table in the Linux kernel. 
The Linux Virtual Server can be used to 
build scalable network services 
based on a cluster of two or more nodes.  
The active  node  of  the cluster redirects service requests to 
a collection of server hosts 
that will actually perform the services. 
Supported features include 
two protocols (TCP and UDP), 
three packet-forwarding methods  (NAT, tunneling, and direct routing), 
and eight load balancing algorithms (
round robin, 
weighted round robin, 
least-connection, 
weighted least-connection, 
locality-based least-connection, 
locality-based  least-connection with replication, 
destination-hashing, 
and source-hashing
).