Nagios freshness checks randomly think check results are from 1973.

[Thomas Guyot-Sionnest]

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On 10/08/08 10:46 AM, fevin Kagen wrote:
> I'm having this exact same issue on two different Nagios servers.  One
> running Fedora and one running Ubuntu.  It is driving me crazy. 
> 
>  
> 
> An SNMP Trap is received for a backup job.  It is properly translated
> and ultimately received by Nagios.  I have a freshness check in place
> for the service that will create a critical alert if a check is not
> received every 26 hours.  For whatever reason, the check is run right
> after the alert is received and it think the results are 12K+ days old. 
> It seems to periodically think the results are from 11-08-1973. 
> 
>  
> 
> This is an ongoing issue on both servers, but certainly isn't the norm.
>  Typically the freshness checks work great.  However, about once or
> twice a week, I see this behavior on random checks.  Here is an example:

There's something wrong with the script/process returning these passive
check. The passive check returned to the Nagios command pipe has the
following format:

> [<timestamp>] PROCESS_PASSIVE_CHECK_RESULT;<hostname>;<service_name>;<return_code>;<status_text>

The timestamp is a normal UNIX timestamp (seconds since EPOCH) and
determine the time at which the check was performed.

If you return an invalid/too old timestamp, Nagios will think the
service is that old and trigger the freshness check.

I believe a possible way to receive such old timestamps is if you have a
server with invalid date (i.e. in the 1972's) using send_nsca, where the
nsca daemon would be set up with max_packet_age=0.

- --
Thomas
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