SNMP monitoring on Ubuntu

[gvrjameskyaw]

Received this error message while trying to monitor disk usage on Ubuntu 16.04.7 LTS server
ERROR: Description/Type table : No response from remote host '10.80.72.115'.
Service Command
check_xi_service_snmp_linux_storage! -C public --v2c -m "^/$" -w 80 -c 95 -f

[pbroste]

Hello @gvrjameskyaw

Thanks for reaching out, and want to go ahead and verify that ports 161 and 162 are allowed. Also verify that security applications like selinux are blocking.

Verify results by running this command:

Code: Select all

snmpwalk -c <yourcommunitystring> -v 2c <youripaddress>

We expect to see results that look similar to:

SNMPv2-MIB::sysORDescr.8 = STRING: The MIB module for managing UDP implementations
SNMPv2-MIB::sysORDescr.9 = STRING: The MIB modules for managing SNMP Notification, plus filtering.
SNMPv2-MIB::sysORDescr.10 = STRING: The MIB module for logging SNMP Notifications.
SNMPv2-MIB::sysORUpTime.1 = Timeticks: (0) 0:00:00.00
SNMPv2-MIB::sysORUpTime.2 = Timeticks: (0) 0:00:00.00
SNMPv2-MIB::sysORUpTime.3 = Timeticks: (0) 0:00:00.00
SNMPv2-MIB::sysORUpTime.4 = Timeticks: (0) 0:00:00.00
SNMPv2-MIB::sysORUpTime.5 = Timeticks: (0) 0:00:00.00

Please let us know the results,
Perry

[gvrjameskyaw]

Hi Perry,

Is it TCP or UDP 161 and 162? Also, only inbound traffic on destination IP?
The result I received after running snmpwalk -c communitystring -v 2c destination ip is "Timeout: No Response from 10.28.8.78"
Thanks

Hello @gvrjameskyaw

Thanks for reaching out, and want to go ahead and verify that ports 161 and 162 are allowed. Also verify that security applications like selinux are blocking.

Verify results by running this command:

Code: Select all

snmpwalk -c <yourcommunitystring> -v 2c <youripaddress>

We expect to see results that look similar to:

SNMPv2-MIB::sysORDescr.8 = STRING: The MIB module for managing UDP implementations
SNMPv2-MIB::sysORDescr.9 = STRING: The MIB modules for managing SNMP Notification, plus filtering.
SNMPv2-MIB::sysORDescr.10 = STRING: The MIB module for logging SNMP Notifications.
SNMPv2-MIB::sysORUpTime.1 = Timeticks: (0) 0:00:00.00
SNMPv2-MIB::sysORUpTime.2 = Timeticks: (0) 0:00:00.00
SNMPv2-MIB::sysORUpTime.3 = Timeticks: (0) 0:00:00.00
SNMPv2-MIB::sysORUpTime.4 = Timeticks: (0) 0:00:00.00
SNMPv2-MIB::sysORUpTime.5 = Timeticks: (0) 0:00:00.00

Please let us know the results,
Perry

[pbroste]

Hello @gvrjameskyaw

SNMP uses UDP port 161 and port 162.

Please let us know if you need anything further,
Perry

[gvrjameskyaw]

So for firewall request it would look like...

Nagios XI server ==> open UDP 161, 162 ==> destination host.

Is there any need to open inbound ports on the Nagios server also?

Thanks

[gsmith]

Hi,

Nope, no changes are needed on the Nagios XXI server.

Thanks

[gvrjameskyaw]

When I try to monitor Disk Usage on Ubuntu server using SNMP
check_xi_service_snmp_linux_storage! -C public --v2c -m "^/$" -w 80 -c 95 -f

I got this error Unknown storage : ^/$ : ERROR

[gsmith]

Hi

From looking at the help for that plugin it shows:

example :
Browse storage list : <script> -C <community> -H <host> -m <anything> -w 1 -c 2 -v
the -m option allows regexp in perl format :
Test drive C,F,G,H,I on Windows : -m ^[CFGHI]:
Test all mounts containing /var : -m /var
Test all mounts under /var : -m ^/var
Test only /var : -m /var -r
Test all swap spaces : -m ^Swap
Test all but swap spaces : -m ^Swap -e

So try removing the quotes around the argument to the -m option:
check_xi_service_snmp_linux_storage! -C public --v2c -m ^/$ -w 80 -c 95 -f

Thanks

[gvrjameskyaw]

Still getting Unknown storage : ^/var : ERROR

check_xi_service_snmp_linux_storage! -C public --v2c -m ^/var -w 80 -c 95 -f

[gsmith]

Hi,

Please change the ^/var to ^/$ (that's a dollar sign not an S).

Here is the command and the output:

Code: Select all

[nagios@gs-cent8-23-82 ~]$ /usr/local/nagios/libexec/check_snmp_storage_wizard.pl -H 192.168.23.93 -C public --v2c -m ^/$ -w 80 -c 95 -f
/: 26%used(6208MB/23555MB) (<80%) : OK | '/'=6208MB;18844;22378;0;23555

Thank you