keepalived+mysql实现高可用的脚本

#monitor mysql service status and server load
#!/bin/bash
function Send_Email()
{
ADMIN="[e-mail]"
MESSAGE_FILE="/tmp/monitor.log"
        echo "VIP has been changed at `date`,please check it!Message:$1" > $MESSAGE_FILE
        /bin/mail -s "VIP has been changed" $ADMIN < $MESSAGE_FILE
rm -r $MESSAGE_FILE
}

while true; do
    sleep 1
CPU_NUMBER=`cat /proc/cpuinfo |grep processor |wc -l`
MAX_LOAD=`echo $CPU_NUMBER*2|bc`
KEEPALIVED_ALIVE=`ps aux |grep keepalived |grep -v "grep" |wc -l`
# some optional
# USER_NAME=$1
# PASSWORD=$2
# IS_SLAVE=$3
if [ `service mysql status |awk '{print $2}'` = 'running' ]
then
   LOAD=`uptime`
   LOAD=${LOAD##* }
#   if [ `expr $LOAD \< $CPU_LOAD` = 1 ]   # another method,compare integer and decimal
   if [ `echo "$LOAD > $MAX_LOAD" | bc` = 1 ]
   then
#      echo "Average load is BUSY"
      pkill keepalived    # if load is greater than max load then kill keepalived,take VIP point to another server.
      Send_Email "Mysql is alived,Average load is busy,so kill keepalived"
   else
      if [ `echo "$KEEPALIVED_ALIVE < 2 " | bc` = 1 ] # if keepalived is not running ,run it immediately.
      then
          keepalived -D
          Send_Email "Mysql is alived,Average load is Free,Keepalived is not alived,so start keepalived"
      fi
   fi
elif [ `echo "$KEEPALIVED_ALIVE < 2 " | bc` = 0 ]
   then
           pkill keepalived # if mysql service is not running ,then kill keepalived,take VIP point to another server.
           Send_Email "Mysql service is not alived,Keepalived is alived,so kill keepalived."
fi
done
exit 0