How to add custom sensor for PRTG monitor (Linux)

Let say You have some custom script on Linux You want to monitor in PRTG

Main, monitor Redis Keys.

nano /etc/snmp/snmpd.conf

Add the script as following to end of the file:

extend redis_keys /path/to/script.sh

Restart snmpd

/etc/init.d/snmpd restart

Now , we need to find the OID value for our script:

snmptranslate -On NET-SNMP-EXTEND-MIB::nsExtendOutputFull.\"scriptname\"

some times , you need to add mib library to get OID values:

apt-get install snmp-mibs-downloader

In my case , script name is “redis_keys” , so it look like:

snmptranslate -On NET-SNMP-EXTEND-MIB::nsExtendOutputFull.\"redis_keys\"

.1.3.6.1.4.1.8072.1.3.2.3.1.2.10.114.101.100.105.115.95.107.101.121.115

The output is our OID for PRTG:

.1.3.6.1.4.1.8072.1.3.2.3.1.2.10.114.101.100.105.115.95.107.101.121.115

Before deal with PRTG , I want to be sure , my script working and return value:

snmpwalk -v 2c -c [Community String] localhost .1.3.6.1.4.1.8072.1.3.2

 iso.3.6.1.4.1.8072.1.3.2.4.1.2.10.114.101.100.105.115.95.107.101.121.115= STRING: "/ssd/home/adika/monitor/keys" 

Where [Community String] is You PRTG Community String

Now In PRTG:

Choice CUSTOM

Add our OID