Nagios Support Forum

My 4.2.4 Nagios implementation on Ubuntu 16.04 was working without issues. When I updated Ubuntu to 18.04, I had issues with the check_snmp_printer plugin (https://exchange.nagios.org/directory/P ... ck/details). Here is the entry in my command.cfg

#'check_snmp_printer' command definition
define command{
command_name check_snmp_printer
command_line $USER1$/check_snmp_printer -H $HOSTADDRESS$ -C $ARG1$ -t $ARG2$
}

I can run this command on the server
./check_snmp_printer -H x.x.x.x -x public -t "CONSUM TEST"
Consumables you may monitor:
Black Toner Cartridge
Drum Unit

But when I try to check the CONSUM, I receive the error:
./check_snmp_printer -H x.x.x.x -x public -t "CONSUM Black Toner Cartridge"
./check_snmp_printer: line 466: [: No Such Instance currently exists at this OID: integer expression expected
./check_snmp_printer: line 486: let: CURRENT_CAPACITY=No Such Instance currently exists at this OID * 100 / No Such Instance currently exists at this OID: syntax error in expression (error token is "Such Instance currently exists at this OID * 100 / No Such Instance currently exists at this OID")
No Such Instance currently exists at this OID is at 0% - CRITICAL!,| 'No Such Instance currently exists at this OID'=0;20;5

This is the same error that occurs on the web interface as well.

Any thoughts or suggestions? TIA

Running the script with the bash debug option may give us some clues:

In Ubuntu 18, not all of the SNMP MIB files are installed on the server.

They have to be manually installed so run this as root to do so. Then run this to download and install them. To have the new MIBs recognized by net-snmp, edit /etc/snmp/snmp.conf file as follows: Then, test the plugin to see if it works.

I followed the instructions to add the MIBs and made the change to the snmp.conf file and then received the following error:

Bad operator (INTEGER): At line 73 in /usr/share/snmp/mibs/ietf/SNMPv2-PDU

I followed these instructions https://serverfault.com/questions/93611 ... or-in-mibs and deleted my SNMPv2-PDU file. The plugin runs without errors, but does not return any results. Here are the bash -x results:

+ PRIVACYPROTOCOL=public
+ shift
+ shift
+ test -n -t
+ case "$1" in
++ cut -d ' ' -f1
++ echo 'CONSUM Black Toner Cartridge'
+ CHECK_TYPE=CONSUM
++ cut -d ' ' -f2-
++ echo 'CONSUM Black Toner Cartridge'
+ PARAMETER='Black Toner Cartridge'
+ shift
+ shift
+ test -n ''
+ '[' '!' -z CONSUM ']'
+ case "$CHECK_TYPE" in
+ CheckConsumables 'Black Toner Cartridge'
+ CONSUMS_STATE=0
+ HEX_ID=0
+ CURRENT_STATUS=0
+ HEX_MARKER=
+ ASCII_MARKER=
+ MARKERS_MATCHED=
+ case "$1" in
++ walk_snmp 1.3.6.1.2.1.43.11.1.1.6.1 false
++ '[' false = true ']'
++ OUTPUT_OPTIONS=-Oa
++ [[ 2c = 3 ]]
+++ snmpwalk -v 2c -Oa -c public 10.7.225.121 1.3.6.1.2.1.43.11.1.1.6.1
++ RESULT_TEXT='Printer-MIB::prtMarkerSuppliesDescription.1.1 = STRING: "Black Toner Cartridge"
Printer-MIB::prtMarkerSuppliesDescription.1.2 = STRING: "Drum Unit"'
++ RESULT_CODE=0
++ [[ 0 -ne 0 ]]
++ '[' false = true ']'
++ echo 'Printer-MIB::prtMarkerSuppliesDescription.1.1 = STRING: "Black Toner Cartridge"
Printer-MIB::prtMarkerSuppliesDescription.1.2 = STRING: "Drum Unit"'
+ ALL_MARKERS='Printer-MIB::prtMarkerSuppliesDescription.1.1 = STRING: "Black Toner Cartridge"
Printer-MIB::prtMarkerSuppliesDescription.1.2 = STRING: "Drum Unit"'
+ check_snmp_error 0 'Printer-MIB::prtMarkerSuppliesDescription.1.1 = STRING: "Black Toner Cartridge"
Printer-MIB::prtMarkerSuppliesDescription.1.2 = STRING: "Drum Unit"'
+ [[ 0 -ne 0 ]]
++ egrep -i 'Black Toner Cartridge'
++ echo 'Printer-MIB::prtMarkerSuppliesDescription.1.1 = STRING: "Black Toner Cartridge"
Printer-MIB::prtMarkerSuppliesDescription.1.2 = STRING: "Drum Unit"'
+ MARKERS_MATCHED='Printer-MIB::prtMarkerSuppliesDescription.1.1 = STRING: "Black Toner Cartridge"'
+ '[' -z 'Printer-MIB::prtMarkerSuppliesDescription.1.1 = STRING: "Black Toner Cartridge"' ']'
++ awk -F= '{print $1}'
++ awk -F. '{print $8}'
++ echo 'Printer-MIB::prtMarkerSuppliesDescription.1.1 = STRING: "Black Toner Cartridge"'
+ return 0
+ STATE=0
+ '[' '' == '' ']'
+ echo ''

+ exit 0

Can you upload the plugin that you are running to the post so we can view it?
The output does not seem to match what I see so I would like to test with the actual plugin you are using.

I assume you are using check_snmp_printer Version 4.0, which can be downloaded from here:
https://exchange.nagios.org/directory/P ... ck/details

I may be wrong though... As @tgriep mentioned, it's probably the best to know what is the exact plugin that you are using, and test it in-house.

Having said that, I tested the plugin above on Ubuntu 18, and it worked for me. See below:

Yes, I am using the version 4.0 of the check_snmp_printer. I noticed that your reply uses CONSUMX instead of CONSUM and when I changed my code worked! I know this was working on Ubuntu version 14....

I appreciate your help! Thank you!

I am glad I could help! Let us know if it is OK to close this topic. Thank you!

I am closing the topic as requested by the user via PM.