Balanceamento de Carga e Alta Disponibilidade usando IPTABLES

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Esconder código-fonte

#!/bin/bash

www1=192.168.0.3
www2=192.168.0.4
if_int0=eth0

while true; do

   s1="0"
   s2="0"

#TESTANDO SERVIDOR 1
   
   if ping -c 1 -w 1 $www1 1>/dev/null 2>/dev/null; then
      s1="1"
   fi

#TESTANDO SERVIDOR 2
   
   if ping -c 1 -w 1 $www2 1>/dev/null 2>/dev/null; then
      s2="1"
   fi

/sbin/iptables -D PREROUTING -t nat -t $if_int0 -j DNAT --to 192.168.0.3 2>/dev/null   
/sbin/iptables -D PREROUTING -t nat -t $if_int0 -j DNAT --to 192.168.0.4 2>/dev/null
/sbin/iptables -D PREROUTING -t nat -t $if_int0 -j DNAT --to 192.168.0.3-192.168.0.4 2>/dev/null

   if [ $s1 = "1" -a $s2 = "1" ]; then
      echo "Server 1e2"
      /sbin/iptables -A PREROUTING -t nat -i $if_int0 -j DNAT --to 192.168.0.3-192.168.0.4
   elif [ $s1 = "1" ]; then
      echo "Server 1"
      /sbin/iptables -A PREROUTING -t nat -i $if_int0 -j DNAT --to 192.168.0.3
   if [ $s2 = "1" ]; then
      echo "Server 2"
      /sbin/iptables -A PREROUTING -t nat -i $if_int0 -j DNAT --to 192.168.0.4
   else
      echo "Servidores 1 e 2 não respondem!"
   fi
   
sleep 10
done