Please help to amend this script that can automatically reboot server by condition

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Please could someone help me to correct below scripts that can automatically reboot Centos 5 server once the memory less than 85 and server load over 3. I found this script via Google,I checked it and found there are syntax errors,but I know nothing on bash script programming,so I need your help ,thanks in advance

#!/bin/sh
#usage: */2 * * * * root /root/checkload.sh

FREE_MEM_MIN="50"
# 设置最大系统负载
SYS_LOAD_MAX="3"

RESTART_FREE_MEM_MIN="500"

NAME_LIST="httpd mysqld"
for NAME in $NAME_LIST
do

    FREE_MEM=`free -m|grep Mem|awk '{print $4}'`

    #FREE_MEM=`free -m|grep Mem|awk '{print $3}'`

    SYS_LOAD=`uptime | awk '{print $(NF-2)}' | sed 's/,//'`

    MEM_VULE=`awk 'BEGIN{print('"$FREE_MEM"'<'"$FREE_MEM_MIN"'?"1":"0")}'`
    LOAD_VULE=`awk 'BEGIN{print('"$SYS_LOAD"'>='"$SYS_LOAD_MAX"'?"1":"0")}'`


    #LOAD_VULE="1"
    #echo $(date +"%y-%m-%d %H:%M:%S") "DEBUG $NAME" "(FREE_MEM:$FREE_MEM|$MEM_VULE,LOAD:$SYS_LOAD|$LOAD_VULE)">> /var/log/autoreboot_debug.log



    if [ $MEM_VULE = 1 ] || [ $LOAD_VULE = 1 ] ;then

        echo $(date +"%y-%m-%d %H:%M:%S") "killall $NAME" "(FREE_MEM:$FREE_MEM,LOAD:$SYS_LOAD)">> /var/log/autoreboot.log

        service $NAME stop
        sleep 3

        skill $NAME

        sleep 10
 for i in 1 2 3
 do
  FREE_MEM=`free -m|grep Mem|awk '{print $4}'`
  MEM_VULE=`awk 'BEGIN{print('"$FREE_MEM"'>='"$RESTART_FREE_MEM_MIN"'?"1":"0")}'`
  if [ `pgrep $NAME | wc -l` -le 0 ] && [ $MEM_VULE = 1 ]
  then
   service $NAME start
   sleep 15
   echo "AutoStart:" $(date +"%y-%m-%d %H:%M:%S") "start $NAME" `ps -ef | grep $NAME | wc -l` > /var/log/autoreboot.log
  fi
 done


        echo $(date +"%y-%m-%d %H:%M:%S") "start $NAME" "(FREE_MEM:$FREE_MEM,LOAD:$SYS_LOAD)" >> /var/log/autoreboot.log
    else
 MEM_VULE=`awk 'BEGIN{print('"$FREE_MEM"'>='"$RESTART_FREE_MEM_MIN"'?"1":"0")}'`
 if [ `pgrep $NAME | wc -l` -le 0 ] && [ $MEM_VULE = 1 ]
 then
  service $NAME start
  sleep 15
  echo "AutoStart:" $(date +"%y-%m-%d %H:%M:%S") "start $NAME" `ps -ef | grep $NAME | wc -l` > /var/log/autoreboot.log
 else
  echo "$NAME very health!(FREE_MEM:$FREE_MEM,LOAD:$SYS_LOAD)" > /dev/null
 fi
    fi
done

Answer

Take a look at monit, it seems to be capable of what you need and more.

Attribution
Source : Link , Question Author : user167043 , Answer Author : Unreason

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