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Following is a currently-operational configuration for
LVS balancing of a set of 3 RealServers (or Real Servers, in LVS-terminology)
It has been running at very high loads (thousands of simultaneous
connections) for months, in addition to numerous conventional LVS
setups for more familiar web load-balancing at massive loads.
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#!/bin/sh
# LVS initialization for RealNetworks streaming.
#
# client connects on TCP ports 554 (rtsp) or 7070 (pnm, deprecated)
# data returns to client either as UDP on port-range 6970-7170, or
# via the initial TCP socket, if the client cannot receive the UDP stream.
# written and tested to very high (several thousand simultaneous) client load by
# Mark Winter, network department, RealNetworks
# additional LVS work by Rodney Rutherford & Glen Raynor, internet operations
# with random comments by Jerry Black, former Director of Internet Operations
# supplied with no warranty, support, or sympathy, but it works great for us
# Setup IP Addresses
VIP="publicly-advertised-IP-number.mynet.com"
RIP_1="RealServer-1.mynet.com"
RIP_2="RealServer-2.mynet.com"
RIP_3="RealServer-3.mynet.com"
# Load needed modules
BALANCE="wrr"
# Load LVS fwmark module
/sbin/modprobe ip_masq_mfw
# Load appropriate LVS load-balance algorithm module
/sbin/modprobe ip_vs_$BALANCE
# Mark packets with FWMARK1
/sbin/ipchains -F
/sbin/ipchains -A input -d ${VIP}/32 7070 -p tcp -m 1
/sbin/ipchains -A input -d ${VIP}/32 554 -p tcp -m 1
/sbin/ipchains -A input -d ${VIP}/32 8080 -p tcp -m 1
/sbin/ipchains -A input -s 0.0.0.0/0 6970:7170 -d ${VIP}/32 -p udp -m 1
# Setup the LVS to listen to FWMARK1
/sbin/ipvsadm -C
/sbin/ipvsadm -A -f 1 -p -s $BALANCE
# Setup the real servers
/sbin/ipvsadm -a -f 1 -r ${RIP_1}
/sbin/ipvsadm -a -f 1 -r ${RIP_2}
/sbin/ipvsadm -a -f 1 -r ${RIP_3}
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