eventhandlers running when a dependent service dependency is not satisfied

[Eli Stair]

Thanks for your response Hugo.

In this case I have service checks named:

   SSH   # uses check_ssh plugin
   SNMP  # gets a low-latency MIB to ensure SNMPd is answering
   SNMP-- $DAEMON ## where $DAEMON is one of many processes that need to 
be running on the host (each with its own service definition).

In this case SSH does not have any dependencies, it is to be the 'root' 
check that all the other services should in the end rely on.

The wildcard matches all the process checks over SNMP, and are 
(intended) to be dependent on the SNMP daemon running properly.  The 
event handlers for these particular services just SSH to the node and 
restart the service.  However to keep this clean I just wanted to make 
sure that those aren't occuring _unless_ it was confirmed that SNMP and 
SSH are already running (otherwise the node could be down hard, or it 
could be responding to a simple death of one of its dependent processes)...

The root issue was an assumption on my part that the 
service_dependencies did something they did not (i.e., re-checking 
master states when a child failed a check).

Now that I realize I need to add a SCHEDULE_FORCED_SVC_CHECK to the 
first run of the event handlers to force a re-check of the state of its 
master service, I believe I can pull this off properly.

Cheers,

/eli

Hugo van der Kooij wrote:
> On Thu, 8 Dec 2005, Eli Stair wrote:
> 
> 
>>   SSH -- SNMP --\
>>                  - Ganglia
>>                  - NTP
> 
> 
>>define servicedependency{
>>         host_name                       HOSTNAME1
>>         service_description             SSH
>>         dependent_host_name             HOSTNAME1
>>         dependent_service_description   SNMP
>>         execution_failure_criteria      w,p,u,c
>>         notification_failure_criteria   w,p,u,c
>>         inherits_parent                 1
>>}
> 
> 
> Here you asume that if SSH fails because it depends on another service it
> will also fail SNMP
> 
> I have not seen SSH being dependent on anything however in your
> description. How a non exsiting parent will impact services is unknown to
> me.
> 
> 
>>define servicedependency{
>>         host_name                       HOSTNAME1
>>         service_description             SNMP
>>         dependent_host_name             HOSTNAME1
>>         dependent_service_description   SNMP--*
>>         execution_failure_criteria      w,p,u,c
>>         notification_failure_criteria   w,p,u,c
>>         inherits_parent                 1
>>}
> 
> 
> Is this a real wildcard? Are they supported?
> 
> I would expect:
> 
> define servicedependency{
>           host_name                       HOSTNAME1
>           service_description             SNMP
>           dependent_host_name             HOSTNAME1
>           dependent_service_description   NTP
>           execution_failure_criteria      w,p,u,c
>           notification_failure_criteria   w,p,u,c
>           inherits_parent                 1
> }
> 
> define servicedependency{
>           host_name                       HOSTNAME1
>           service_description             SNMP
>           dependent_host_name             HOSTNAME1
>           dependent_service_description   Ganglia
>           execution_failure_criteria      w,p,u,c
>           notification_failure_criteria   w,p,u,c
>           inherits_parent                 1
> }
> 
> 
> Hugo.
> 



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