check_ntp offsets

Thomas Guyot-Sionnest dermoth at aei.ca
Wed Aug 19 05:09:14 CEST 2009


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On 18/08/09 10:13 PM, Onotsky, Steve x55328 wrote:
>> -----Original Message-----
>> From: Chris [mailto:atstake at gmail.com]
>> Sent: August 18, 2009 21:56
>> To: nagios-users ML
>> Subject: [Nagios-users] check_ntp offsets
>>
>> I am running check_ntp plugin and I have setup an offset threshold of
>> -w 200 -c 300 but Nagios is still showing "Offset -102.234564 secs"
>> (Warning)
>>
>> Running check_ntp from command line shows NTP OK
>> (/usr/lib/nagios/plugins/check_ntp -H hostname -w 200 -c 300)
>>
>> Output: NTP OK: Offset -102.234564
>> secs|offset=-102.234564s;200.000000;300.000000;
>>
>> Here is what I have added:
>>
>> edit /etc/nagios/objetcs/command.cfg and add:
>>
>> define command{
>>         command_name check_ntp
>>         command_line $USER1$/check_ntp -H $HOSTADDRESS$ -w $ARG1$ -c
>> $ARG2$
>> }
>>
>> edit /etc/nagios/objetcs/server.cfg and add:
>>
>> define service{
>>         use                             critical-service
>>         host_name  			hostname
>>         service_description             NTP
>>         check_command                   check_ntp!200!300
>>         }
> 
> According to your check definition, the result is absolutely correct.
> You asked it to warn you if the offset is more than 200 seconds, and go
> critical if over 300 seconds.
> 
> What you were probably hoping for were thresholds in milliseconds.  In
> that case, you'll want to set -w and -c to fractional values ("-w 0.2 -c
> 0.3", or whatever values you actually want as thresholds).

The offset and thresholds are both in seconds:

$ ./check_ntp -H pool.ntp.org -w 0.001 -c 0.01
NTP WARNING: Offset 0.008824706078 secs |offset=0.008825s;0.001000;0.010000;

- --
Thomas
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