Here is a Bourne shell Nagios plugin which can be executed directly from the NAS Synology. It's inspired by the great work of Jur Groen and Nicolas Ordonez.
The plugin will check the following elements :
The plugin can be used remotly (from the Synology NAS) or localy (from the Nagios server). 
Note that the disk usage functionality is only available with the remote method.
root@host:~# apt install sudo snmp
Here, the plugin will be executed from the Nagios Server and will send requests via SNMPv3.
root@host:~# chmod +x ./check_syno.sh
root@host:~# sudo -u nagios ./check_syno.sh -u user -p PassW0RD -h 192.168.1.200
OK - The NAS DS218j - SN : 254262N214800 - DSM : DSM 6.2-25426 is fine NAS temperature is 40°C - Fan Status : OK - CPU Fan Status : OK - Power Status : OK - System Status : OK The Hard Drive 2 model HD204UI is functioning normally The Hard Drive 1 model WD20EARX-00PASB0 is functioning normally The RAID Storage Pool 1 is fine The RAID Volume 2 is fine
Here, the plugin will be launched from the Nagios Server via ssh and executed on the NAS Synology. In this mode disk usage functionality will be available.
SAAuthentication yes PubkeyAuthentication yes AuthorizedKeysFile .ssh/authorized_keys
synoservicectl --restart sshd
chmod 0711 ~ chmod 0711 ~/.ssh chmod 0600 ~/.ssh/authorized_keys
root@host:~# sudo -u nagios ssh-keygen -t rsa
root@host:~# sudo -u nagios cat /var/lib/nagios/.ssh/id_rsa.pub | ssh SSH_USER@192.168.1.200 'cat >> .ssh/authorized_keys'
user@host:~$ scp check_syno.sh SSH_USER@192.168.1.200:/usr/syno/sbin/
root@host:~# sudo -u nagios ssh -l SSH_USER 192.168.1.200 /usr/syno/sbin/check_syno.sh -h 127.0.0.1 -u SNMP_USER -p SNMP_PASSWORD -w 80 -c 90
OK - The NAS DS218j - SN : 254262N214800 - DSM : DSM 6.2-25426 is fine NAS temperature is 40°C - Fan Status : OK - CPU Fan Status : OK - Power Status : OK - System Status : OK The Hard Drive 2 model HD204UI is functioning normally The Hard Drive 1 model WD20EARX-00PASB0 is functioning normally The RAID Storage Pool 1 is fine The RAID Volume 2 is fine /volume2 is used at 49%, 947G remaining free space /tmp is used at 1%, 249M remaining free space / is used at 42%, 1.3G remaining free space
Fr
#! /bin/bash
# check_snmp_synology for nagios version 1.4
# 30.04.2013 Nicolas Ordonez, Switzerland
# 03.10.2014 Jur Groen, Syso IT Services, The Netherlands
# 06.11.2014 shebangthedolphins.net
# 05.12.2014 shebangthedolphins.net add disk usage check
# 17.09.2020 shebangthedolphins.net bugs correction, DSM 6 compatibility, improve snmpv3 security (SHA and AES)
#---------------------------------------------------
# this plugin checks the health of your Synology NAS
# - System status (Power, Fans)
# - Disks status
# - RAID status
# - DSM update status
#
# this plugin now makes use of SNMP V3 for enhanced security
# Tested with DSM 6.0
#---------------------------------------------------
# Based on http://download.synology.com/download/ds/userguide/Synology_DiskStation_MIB_Guide_enu_20110725.pdf
#---------------------------------------------------
#Variables definition
## NAGIOS returns
CRITICAL=2
WARNING=1
OK=0
RETURN=0 #everything's fine, by default
## If arguments found
option_found=0
#get the number of partitions
NB_part=$(df -h | grep "/" | grep -v "\(\/tmpfs\|\/shm\|\/sys\|\/run\|\/dev$\|\/rootfs\)" | wc -l)
##OIDs
OID_syno="1.3.6.1.4.1.6574"
OID_model="1.3.6.1.4.1.6574.1.5.1.0"
OID_serialNumber="1.3.6.1.4.1.6574.1.5.2.0"
OID_DSMVersion="1.3.6.1.4.1.6574.1.5.3.0"
OID_upgradeAvailable="1.3.6.1.4.1.6574.1.5.4.0"
OID_systemStatus="1.3.6.1.4.1.6574.1.1.0"
OID_powerStatus="1.3.6.1.4.1.6574.1.3.0"
OID_systemFanStatus="1.3.6.1.4.1.6574.1.4.1.0"
OID_CPUFanStatus="1.3.6.1.4.1.6574.1.4.2.0"
OID_temp="1.3.6.1.4.1.6574.1.2.0"
OID_disk=""
OID_diskID="1.3.6.1.4.1.6574.2.1.1.2"
OID_diskModel="1.3.6.1.4.1.6574.2.1.1.3"
OID_diskStatus="1.3.6.1.4.1.6574.2.1.1.5"
OID_diskTemp="1.3.6.1.4.1.6574.2.1.1.6"
OID_RAID=""
OID_RAIDName="1.3.6.1.4.1.6574.3.1.1.2"
OID_RAIDStatus="1.3.6.1.4.1.6574.3.1.1.3"
#Functions
FunctionDiskSpace()
{
if [ "$HOSTNAME" == "127.0.0.1" ]; then #check disk usage only if executed on the synology nas
for i in $(seq 1 "$NB_part"); do
PARTITION=$(df -h | grep "/" | tr -s " " | grep -v "\(\/tmpfs\|\/shm\|\/sys\|\/run\|\/dev$\|\/rootfs\)" | head -n "$i" | tail -n 1 | grep "/" | cut -d " " -f 6)
UTI=$(df -h | grep "/" | tr -s " " | grep -v "\(\/tmpfs\|\/shm\|\/sys\|\/run\|\/dev$\|\/rootfs\)" | head -n "$i" | tail -n 1 | grep "/" | cut -d " " -f 5)
DISPO=$(df -h | grep "/" | tr -s " " | grep -v "\(\/tmpfs\|\/shm\|\/sys\|\/run\|\/dev$\|\/rootfs\)" | head -n "$i" | tail -n 1 | grep "/" | cut -d " " -f 4)
SORTIE="$(echo ""$PARTITION" is used at "$UTI", "$DISPO" remaining free space") \n"$SORTIE""
TEST=$(echo "$UTI" | sed 's/%//')
if [ $TEST -gt "$WARNING_SPACE" ]; then
RETURN="$WARNING"
if [ "$TEST" -gt "$CRITICAL_SPACE" ]; then
RETURN="$CRITICAL"
fi
fi
done
if [ "$1" == "Output" ]; then
echo -e "$SORTIE"
fi
SORTIE=""
fi
}
usage()
{
echo "usage: ./check_snmp_synology -u [snmp username] -p [snmp password] -h [hostname] -w [warning occuped space in %] -c [max occuped space in %]"
echo ""
exit 3
}
while getopts u:p:h:c:w: OPTNAME; do
case "$OPTNAME" in
u)
SNMPUSERNAME="$OPTARG"
option_found=1
;;
p)
SNMPPASSWORD="$OPTARG"
option_found=1
;;
h)
HOSTNAME="$OPTARG"
option_found=1
;;
w)
WARNING_SPACE="$OPTARG"
option_found=1
;;
c)
CRITICAL_SPACE="$OPTARG"
option_found=1
;;
*)
usage
;;
esac
done
# Script beginning :
if [ "$option_found" -eq "0" ] || [ "$HOSTNAME" == "" ] ; then
usage
else
# DiskSpace function usage but without print anything
FunctionDiskSpace NoOutput
nbDISK=$(snmpwalk -OQne -v 3 -t 10 -l authNoPriv -u $SNMPUSERNAME -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" $HOSTNAME .1.3.6.1.4.1.6574.2.1.1.3 2>/dev/null|wc -l)
#if SNMP failed, exit with error
if [ "$?" != "0" ] ; then
echo "CRITICAL - Problem with SNMP request"
exit "$CRITICAL"
fi
nbRAID=$(snmpwalk -OQne -v 3 -t 10 -l authNoPriv -u $SNMPUSERNAME -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" $HOSTNAME .1.3.6.1.4.1.6574.3.1.1.2 2>/dev/null|wc -l)
for i in $(seq 1 $nbDISK);
do
OID_DISK="$OID_disk $OID_diskID.$(($i-1)) $OID_diskModel.$(($i-1)) $OID_diskStatus.$(($i-1)) $OID_diskTemp.$(($i-1)) "
done
for i in $(seq 1 $nbRAID);
do
OID_RAID="$OID_RAID $OID_RAIDName.$(($i-1)) $OID_RAIDStatus.$(($i-1))"
done
#MODEL
temp=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_model" 2>/dev/null)
model=$(echo $temp | grep $OID_model | cut -d " " -f3 | sed "s/\"//g")
#echo $model
#serialNumber
temp=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_serialNumber" 2>/dev/null)
serialNumber=$(echo $temp | grep $OID_serialNumber | cut -d " " -f3 | sed "s/\"//g")
#echo $serialNumber
#OID_upgradeAvailable
temp=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_upgradeAvailable" 2>/dev/null)
#OID_DSMVersion
temp=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_DSMVersion" 2>/dev/null)
DSMVersion=$(echo $temp | grep $OID_DSMVersion | cut -d "\"" -f2)
#echo "$DSMVersion"
#OID_systemStatus
temp=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_systemStatus" 2>/dev/null)
systemStatus=$(echo $temp | grep $OID_systemStatus | cut -d " " -f3 | sed "s/\"//g")
#echo $systemStatus
#OID_powerStatus
temp=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_powerStatus" 2>/dev/null)
powerStatus=$(echo $temp | grep $OID_powerStatus | cut -d " " -f3 | sed "s/\"//g")
#echo $powerStatus
#OID_systemFanStatus
temp=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_systemFanStatus" 2>/dev/null)
systemFanStatus=$(echo $temp | grep $OID_systemFanStatus | cut -d " " -f3 | sed "s/\"//g")
#echo $systemFanStatus
#OID_CPUFanStatus
temp=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_CPUFanStatus" 2>/dev/null)
CPUFanStatus=$(echo $temp | grep $OID_CPUFanStatus | cut -d " " -f3 | sed "s/\"//g")
#echo $CPUFanStatus
#OID_temp
temp=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_temp" 2>/dev/null)
TEMP=$(echo "$temp" | grep "$OID_temp" | cut -d " " -f3 | sed "s/\"//g")
#echo "$TEMP"
#Disks state
for i in $(seq 1 "$nbDISK")
do
temp01=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_diskStatus.$(($i-1))" 2>/dev/null)
temp02=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_diskModel.$(($i-1))" 2>/dev/null)
temp03=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_diskID.$(($i-1))" 2>/dev/null)
temp04=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_diskTemp.$(($i-1))" 2>/dev/null)
status=$(echo "$temp01" | grep "$OID_disk" | cut -d " " -f3)
diskmodel=$(echo "$temp02" | grep "$OID_disk" | cut -d "\"" -f2 | sed 's/\s//g')
ID=$(echo "$temp03" | grep "$OID_disk" | cut -d "\"" -f2)
temp=$(echo "$temp04" | grep "$OID_disk" | cut -d " " -f3)
if [ "$status" -eq "5" ]; then
disques="$(echo "The Hard "$ID" model "$diskmodel" is damaged")\\n"$disques""
RETURN="$CRITICAL"
elif [ "$status" -eq "4" ]; then
disques="$(echo "The Hard "$ID" model "$diskmodel" has partitions damaged")\\n"$disques""
RETURN="$CRITICAL"
elif [ "$status" -eq "3" ]; then
disques="$(echo "The Hard "$ID" model "$diskmodel" is not partitioned")\\n"$disques""
RETURN="$WARNING"
elif [ "$status" -eq "2" ]; then
disques="$(echo "The Hard "$ID" model "$diskmodel" has system partitions but no data")\\n"$disques""
RETURN="$WARNING"
elif [ "$status" -eq "1" ]; then
disques="$(echo "The Hard "$ID" model "$diskmodel" is functioning normally")\\n"$disques""
#RETURN=$(echo "$OK")
else
disques="$(echo "The Hard "$ID" model "$diskmodel" is in an unknown state")\\n"$disques""
RETURN="$WARNING"
fi
done
#RAID State
for i in $(seq 1 "$nbRAID")
do
temp01=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_RAIDName.$(($i-1))" 2>/dev/null)
temp02=$(snmpwalk -OQne -t 10 -v 3 -l authNoPriv -u "$SNMPUSERNAME" -a SHA -A "$SNMPPASSWORD" -x AES -X "$SNMPPASSWORD" "$HOSTNAME" "$OID_RAIDStatus.$(($i-1))" 2>/dev/null)
Volume=$(echo "$temp01" | grep "$OID_disk" | cut -d "\"" -f2)
Statut=$(echo "$temp02" | grep "$OID_disk" | cut -d " " -f3)
if [ "$Statut" -eq "11" ]; then
raids="$(echo "The RAID "$Volume" is degraded") "$raids""
RETURN="$CRITICAL"
elif [ "$Statut" -eq "12" ]; then
raids="$(echo "The RAID "$Volume" has crashed") "$raids""
RETURN="$CRITICAL"
elif [ "$Statut" -eq "1" ]; then
raids="$(echo "The RAID "$Volume" is fine") "$raids""
else
raids="$(echo "The RAID "$Volume" is in an unknown state") "$raids""
RETURN="$WARNING"
fi
done
# Nagios States
if [ "$RETURN" -eq "2" ] || [ "$systemFanStatus" -eq "2" ] || [ "$CPUFanStatus" -eq "2" ] || [ "$powerStatus" -eq "2" ] || [ "$systemStatus" -eq "2" ]; then
echo -e "CRITICAL - The NAS "$model" - SN : "$serialNumber" - DSM : "$DSMVersion" has a problem"
echo -e "NAS temperature is "$TEMP"°C - Fan Status : "$systemFanStatus" - CPU Fan Status : "$CPUFanStatus" - Power Status : "$powerStatus" - System Status : "$systemStatus" " | sed 's/ 1 / OK
for i in "$disques"; do
echo -e "$i" | sed '/^$/d'
done
for i in "$raids"; do
echo -e "$i" | sed '/^$/d'
done
FunctionDiskSpace Output
exit "$CRITICAL"
fi
if [ "$RETURN" -eq "1" ]; then
echo -e "WARNING - The NAS "$model" - SN : "$serialNumber" - DSM : "$DSMVersion" is in Warning state"
echo -e "NAS temperature is "$TEMP"°C - Fan Status : "$systemFanStatus" - CPU Fan Status : "$CPUFanStatus" - Power Status : "$powerStatus" - System Status : "$systemStatus" " | sed 's/ 1 / OK
for i in "$disques"; do
echo -e "$i" | sed '/^$/d'
done
for i in "$raids"; do
echo -e "$i" | sed '/^$/d'
done
FunctionDiskSpace Output
exit "$WARNING"
fi
if [ "$RETURN" -eq "0" ]; then
echo -e "OK - The NAS "$model" - SN : "$serialNumber" - DSM : "$DSMVersion" is fine"
echo -e "NAS temperature is "$TEMP"°C - Fan Status : "$systemFanStatus" - CPU Fan Status : "$CPUFanStatus" - Power Status : "$powerStatus" - System Status : "$systemStatus" " | sed 's/ 1 / OK /g' | sed 's/ 2 / FAILED /g'
for i in "$disques"; do
echo -e "$i" | sed '/^$/d'
done
for i in "$raids"; do
echo -e "$i" | sed '/^$/d'
done
FunctionDiskSpace Output
exit "$OK"
fi
echo -e "CRITICAL - The NAS "$model" - SN : "$serialNumber" - DSM : "$DSMVersion" is in an indeterminate State"
exit "$CRITICAL"
fi
I don't use Nagios anymore but the configuration should be like this.
define command {
command_name check_syno_local
command_line /usr/local/sbin/check_syno.sh -u $ARG1$ -p $ARG2$ -h $ARG3$
}
define command {
command_name check_syno_remote
command_line ssh -l $ARG1$ $ARG2$ /usr/syno/sbin/check_syno.sh -h 127.0.0.1 -u $ARG3$ -p $ARG4$ -w 80 -c 90
}
define service{
use nassynology-service
host_name NAS Synology
servicegroups nas-synology
service_description Backup Local NAS
check_command check_syno_local!SNMP_USER PassW0RD 192.168.1.200
}
define service{
use nassynology-service
host_name NAS Synology
servicegroups nas-synology
service_description Backup Remote NAS
check_command check_syno_remote!SSH_USER 192.168.1.200 SNMP_USER PassW0RD
}
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