Failover - Host two will be added in hosts file If Host one is Down | Linux

This bash script we used for our of our client.
to use simple create a file e.g failover.sh and paste the below mentioned script into it.
now configure a cronjob to run this script every after 5 minutes or whatever you like.

#!/bin/bash
HOST1="10.2.4.115"
HOST2="10.2.4.116"
COUNT=4
for myHost in $HOST1
do
  count=$(ping -c $COUNT $myHost | grep 'received' | awk -F',' '{ print $2 }' | awk '{ print $1 }' 2>/dev/null)
  #count=$count"skj"
#  echo $count" ccc"
  if [ $count -gt 0 ]; then
    # 100% failed
    g_count=`grep -c $HOST1 /etc/hosts`
    if [ $g_count -eq 0 ]; then
      echo "change host1 ip"
     `cat /etc/hosts | sed 's/10.2.4.116/10.2.4.115/' > /etc/hosts_tmp`
     `cp /etc/hosts_tmp /etc/hosts --reply=yes`
    fi
    echo "Host : $myHost is UP"
  else
    g_count=`grep -c $HOST2 /etc/hosts`
    echo $g_count
    if [ $g_count -eq 0 ]; then
      echo "change  host2 ip"
     `cat /etc/hosts | sed 's/10.2.4.115/10.2.4.116/' > /etc/hosts_tmp`
     `cp /etc/hosts_tmp /etc/hosts --reply=yes`
    fi
    echo "Host : $myHost is down"
  fi
done