check_by_top

#!/bin/bash
#
# ------------------------------------------------------------------------------------
#
#       Nagios check plugin for Linux 
#
# ------------------------------------------------------------------------------------

program=`basename $0`
version="2021-08-11, Rafael.Urrutia.S@gmail.com"

# Nagios return codes
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3

# Get OS name
PhotonOS=0
SUSE=0
CentOS=0
OSFile=/etc/os-release

if [ ! -f $OSFile ];then
	echo " Missing OS file $OSFile!"
	echo " Plaese create a symlink to the actual one"
	exit $STATE_UNKNOWN
fi

cat $OSFile |grep ^NAME|grep "Photon" 		> /dev/null 2>&1 && PhotonOS=1
cat $OSFile |grep PRETTY_NAME|grep SUSE  	> /dev/null 2>&1 && SUSE=1
cat $OSFile |grep CentOS  			> /dev/null 2>&1 && CentOS=1


print_help() {
	echo $version
        echo ""
        echo "This Nagios plugin will check tasks, cpu, mem or swap using command top"
        echo ""
        echo "$program [ -U | --uptime ] [ -T | --tasks ] [ -L | --load ] [ -C | --cpu ] [ -M | --mem ] [ -S | --swap ]"
        echo ""
        exit $STATE_UNKNOWN
}

check_tasks() {
        STATE=1
        TASK=$(top -bn1  |grep ^Task |awk '{print$0 " |Total="$2";Running="$4";Sleeping="$6";Stopped="$8";Zombie="$10}') && STATE=0
        if [ $STATE -eq 0 ];then
                echo "OK - $TASK"
                exit $STATE_OK
        else
                echo "UNKNOWN - check konfiguration or executed command"
                exit $STATE_UNKNOWN
        fi
}

check_uptime(){
	STATE=1
	UPTIME=$(top -bn1 |grep -w up |awk '{print"Uptime: "$5,$6,$7,$3 " |days="$5";hours="$7}') && STATE=0
	if [ $STATE -eq 0 ];then
		echo "OK - $UPTIME"
                exit $STATE_OK
        else
                echo "UNKNOWN - check konfiguration or executed command"
                exit $STATE_UNKNOWN
        fi
}

check_cpu() {
        STATE=1
	if [ $SUSE -eq 1 ];then
		CPU=$(top -bn1  |egrep "^%Cpu|^Cpu") && STATE=0
	elif [ $PhotonOS -eq 1 ];then
		echo "CPU Check not implemented on 'VMware Photon OS' jet."
		exit $STATE_UNKNOWN

	elif [ $CentOS -eq 1 ];then
		CPU=$(top -bn1 |egrep ^Cpu) && STATE=0
		CPUPERFd=$(echo $CPU|tr '%' ' ' |awk '{print"us="$2 ";sy="$4 ";ni="$6 ";$id="$8 ";wa="$10 ";hi="$12 ";si="$14 ";st="$16}')
		CPU="$CPU | $CPUPERFd"
	else
		CPU=$(top -bn1 |egrep "^%Cpu|^Cpu" |awk '{print$0 " |us="$2";sy="$4";ni="$6";id="$8";wa="$10";hi="$12";si="$14";st="$16}') && STATE=0
	fi
        if [ $STATE -eq 0 ];then
                echo "OK - $CPU"
                exit $STATE_OK
        else
                echo "UNKNOWN - check konfiguration or executed command"
                exit $STATE_UNKNOWN
        fi
}

check_mem() {
        STATE=1
	if [ $SUSE -eq 1 ];then
		MEM=$(top -bn1  |grep ^Mem: |awk '{print$0 " |total="$2";used="$4";free="$6";buffers="$8}') && STATE=0
	elif [ $PhotonOS -eq 1 ];then
		MEM=$(top -bn1  |grep ^"GiB Mem" |awk -F"[" '{print$1}') && STATE=0
	elif [ $CentOS -eq 1 ];then
		MEM=$(top -bn1  |grep ^"Mem" |awk '{print$0 " |total="$2";used="$4";free="$6";buffers="$8}') && STATE=0
	else
        	MEM=$( top -bn1 |grep ^"KiB Mem" |awk '{print$0 " |total="$3";used="$5";free="$7";buffers="$9}') && STATE=0
	fi
        if [ $STATE -eq 0 ];then
                echo "OK - $MEM"
                exit $STATE_OK
        else
                echo "UNKNOWN - check konfiguration or executed command"
                exit $STATE_UNKNOWN
        fi
}

check_swap() {
        STATE=1
	if [ $SUSE -eq 1 ];then
		SWAP=$(top -bn1  |egrep ^"Swap:" |awk '{print$0 " |total="$2";used="$4";free="$6";cached="$8}') && STATE=0
	elif [ $PhotonOS -eq 1 ];then
		SWAP=$(top -bn1| grep ^"GiB Swap:" |awk -F"[" '{print$1}') && STATE=0
	elif [ $CentOS -eq 1 ];then
		SWAP=$(top -bn1  |egrep "Swap:" |awk '{print$0 " |total="$2";used="$4";free="$6";cached="$8}') && STATE=0
	else
		SWAP=$(top -bn1  |egrep "Swap:" |awk '{print$0 " |total="$3";free="$5";used="$7";avail Mem="$9}') && STATE=0
	fi
        if [ $STATE -eq 0 ];then
                echo "OK - $SWAP"
                exit $STATE_OK
        else
                echo "UNKNOWN - check konfiguration or executed command"
                exit $STATE_UNKNOWN
        fi
}

check_load() {
        STATE=1
        LOAD=$(top -bn1  |grep "load average" |awk '{print$0 " |load1="$12"; load5="$13"; load15="$14}'|sed 's/,//g') && STATE=0
        if [ $STATE -eq 0 ];then
                echo "OK - $LOAD"
                exit $STATE_OK
        else
                echo "UNKNOWN - check konfiguration or executed command"
                exit $STATE_UNKNOWN
        fi
}



# Parse parameters
[[ $# -eq 0 ]] && print_help
while [ $# -gt 0 ]; do
    case "$1" in
        -h | --help)
                print_help
                exit $STATE_OK
                ;;
        -T | --tasks)
                check_tasks
                ;;
	-U | --uptime)
		check_uptime
		;;
        -C | --cpu)
                check_cpu
                ;;
        -M | --mem)
                check_mem
                ;;
        -S | --swap)
                check_swap
                ;;
        -L | --load)
                check_load
                ;;

        *)
            print_help
            ;;
        esac
shift
done