CMK version:
2.1.0p15 OS version:
Windows 10 Error message:
None Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins)
Command ‘cmk’ not found, but can be installed with:
snap install cloudmonkey
(There is a step missing with these instructions)
There looks to be an issue in CheckMK Raw with SNMPv1 and graphs for monitoring purposes
When polling interface bandwidth on a Cisco Nexus switch, on SNMPv1 (it doesn’t work on v2c, we’re stuck with it in v1) and CMK2.0 the graphs worked fine.
Now on CMK 2.1 and the graphs will not show unless a Service rescan is done on the switch and then that tab left open, not practical for the long term, but it at least reveals logged graph data.
before we go into troubleshooting I want to point out that cmk is a checkmk command and has nothing
to do with cloudmonkey!
If you have a ssh session with your checkmk server there will be a cmk command. No need to install anything new or change any instructions.
Have a look at Checkmk on the command line - Understanding and using command line commands
Sorry for the delay,
Running NX-OS - Version 6.0(2)U6(10)
Remove/Rescan with SNMP v2c - No discovery information available
Rescan with SNMPv1 and the Perf-o-meter is still disappearing from the interfaces and takes the graphing with it, why is that happening?
The measured SNMP execution time is 14 seconds and every update 30-60 seconds later a different perf for the interfaces appears… or disappears on just this switch.
This is a buggy experience and quite the nuisance to the network team as we’re trying to accurately monitor over 7000 services and 275 devices.
What check/monitor parameters can be changed to allow CMK more time to collect the PerfData?
I am also working to build a new CMK instance to see if it behaves the same or different with this switch.
V2c works, but bulk requests fail
Some devices support version v2c — and will provide an answer to this in the diagnostics — however, the implementation of the GetBulk command is missing in the protocol. This is used by Checkmk to get as much information as possible with a single request and is very important for the performance.
With such a host, some simple SNMP checks will work — such as SNMP Info or SNMP Uptime, but other services will be missing — especially the network interfaces that must be present on each device.
If you actually have a host where this is the case, you can run it with v2c, but without bulk requests. Configure such a host as follows:
Set the SNMP version for the host properties to SNMP v1.
In the Setup > Agents > SNMP rules > Legacy SNMP devices using SNMP v2c rule set, create a rule for the host, and set the value typically to Positive match (Add matching hosts to the set).
This forces the host to use the SNMP v2c protocol — although version 1 has been set — however without bulkwalk. Incidentally, we do not recommend the use of SNMP v1 — even if that is supported — because it does not support 64-bit counters. This can lead to missing or erroneous measurement data for network ports which are subject to heavy traffic.
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