LVS setup for RealVideo/RealAudio streaming

To: <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: LVS setup for RealVideo/RealAudio streaming
From: Jerry Glomph Black <black@xxxxxxxxxxx>
Date: Thu, 7 Jun 2001 17:00:28 -0700 (PDT)
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.


# 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

# Load needed modules
# 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 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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