Add a routing table and iptables rule to route specified packets via LVS

gistfile1.sh

#!/bin/sh
LVS_IP=172.31.24.1
TABLE=1
ip route flush table $TABLE
ip route show | grep -Ev ^default | while read ROUTE; do
        ip route add table $TABLE $ROUTE
done
ip route add table $TABLE default via $LVS_IP

ip rule del from all fwmark 1
ip rule add fwmark 1 lookup $TABLE
iptables -F -t mangle
iptables -A OUTPUT -t mangle -p tcp --sport 80 -j MARK --set-mark 1