Nagios Plugin CHECK_NRPE Receive header underflow
1. Testing NRPE connection
You can test your connection between your windows and Nagios via NRPE like this :
./check_nrpe -H Server
I (0.4.3.143 2015-04-29) seem to be doing fine...
If you don't pass any arguments to your check_nrpe, the server (windows client) will responde with his version number.
2. Testing your command
On your windows client, you can test locally your command in a console with nscp test
.
If your command return good result, you can test from your nagios server without arguments :
# ./check_nrpe -H Server -c alias_cpu
OK: CPU load is ok.|'total 5m'=1%;80;90 'total 1m'=1%;80;90 'total 5s'=2%;80;90
3. NRPE arguments
By default, NRPE not allow the send of arguments from Nagios to a remote client for security considerations. So, you must enable it in the nsclient.ini for each windows station.
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RE_Woods
Updated on September 18, 2022Comments
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RE_Woods almost 2 years
I run a Nagios Core server on a LAN. I have 5 windows machines outside the network I am talking to via five ssh tunnels on 5 different ports listening to five custom NSClient++ apps. All is working well with this configuration, however I am noticing that check_nt MEMUSE is giving us odd numbers, when in fact all we want/need is the actual Physical memory.
After much digging I discovered check_nrpe, which look like it will give me the data I'm looking for.
I put the following in the commands.cfg:
define command { command_name CheckWindowsPhysicalMem command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -p 5666 -c CheckMEM -a MaxWarn=$ARG1$% MaxCrit=$ARG2$% ShowAll=long type=physical }
And I put the following in my windows.cfg
define service{ use generic-service host_name HOSTNAME service_description Physical Memory check_command CheckWindowsPhysicalMem!80!90 }
I restarted both nagios and nagios-nrpe-server, and now I'm getting this error:
CHECK_NRPE: Receive header underflow - only 0 bytes received (4 expected)
I am not sure what I missed here, but if seems like a dependency or a package. Google-fu lost on this one.
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Admin over 6 yearsAre you using the same version of nrpe on both sides? I hit this problem trying to connect to a very old nrpe server.
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