Hello,
Has anyone run across the check frequency increasing dynamically when
the number of passive check failures reaches a high percentage?
I have only two active checks running for a specific remote server - a
tcp port check for port 22 being open, and a custom check which uses
snmpgetbulkget to retrieve a number of items from a non-standard snmp
server.
The custom plugin takes the results of the snmpbulkget and stuffs them,
one at a time into passive checks for the given server using the nagios
external command file. Each of the passive checks is setup to not
enable active checks, and as a check_command, it uses a simple script
which fails always (it is never to be executed).
There are approximately 100 passive checks on this server with the two
active checks.
I have noticed that with nagios 2.9, that when a large percentage of the
passive checks fail, that Nagios is increasing the frequency of active
checks for that server (only - not all servers) by as much as a factor
of 3.5.
I have not seen documentation describing this activity, and I'm
wondering if it can be configured to not do this.
The frequency of the active checks is once a minute - here is the
service config for the two active checks:
define service{
name generic-service-normal
active_checks_enabled 1
passive_checks_enabled 1
parallelize_check 1
obsess_over_service 1
check_freshness 0
notifications_enabled 1
event_handler_enabled 1
flap_detection_enabled 1
process_perf_data 1
retain_status_information 1
retain_nonstatus_information 1
is_volatile 0
check_period 24x7
max_check_attempts 3
normal_check_interval 1
retry_check_interval 1
notification_interval 120
notification_period 24x7
notification_options w,u,c,r
contact_groups admins
register 0
}
Note that the active checks are not failing during this increased check
frequency - only the passive checks are failing, but that appears to be
increasing the rate of the active checks. I'm stumped!
--
regards,
Bruce L. Friedman
Network & System Administration
InfoDyne Corporation
1460 Renaissance Drive
Park Ridge, IL 60068
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