Additive inheritance and canceling inheritance issues

[Shad L. Lords]

----- Original Message ----- 
From: "Ethan Galstad" <nagios at nagios.org>
To: <nagios at nagios.org>; "Nagios Developers List" 
<nagios-devel at lists.sourceforge.net>
Sent: Thursday, October 18, 2007 6:03 PM
Subject: Re: [Nagios-devel] Additive inheritance and canceling inheritance 
issues


> Ethan Galstad wrote:
>> Shad L. Lords wrote:
>>> Following up on my previous message about additive inhereritance it 
>>> appears
>>> that it only applies to the first used instance.  Here is an example 
>>> config
>>> that fails.  There also appears to be an issue with canceling 
>>> inheritance.
>>>
>>> define host {
>>>         name                            default
>>>         check_command                   check_host_alive
>>>         max_check_attempts              3
>>>         check_period                    24x7
>>>         flap_detection_enabled          1
>>>         process_perf_data               0
>>>         retain_status_information       1
>>>         retain_nonstatus_information    1
>>>         notification_interval           30
>>>         notification_options            d,r,f
>>>         notifications_enabled           1
>>>         register                        0
>>>         }
>>>
>>> define host {
>>>         name            A6
>>>         hostgroups      +rhg_A6
>>>         parents         SW-CAB_A6
>>>         register        0
>>>         }
>>>
>>> define host {
>>>         name                    24x7
>>>         notification_period     24x7
>>>         register                0
>>>         }
>>>
>>> define host {
>>>         name            sec
>>>         hostgroups      +nhg_sec
>>>         contact_groups  +cg_sec1
>>>         register        0
>>>         }
>>>
>>> define host {
>>>         use             default,A6,24x7,sec
>>>         host_name       dwsoms1
>>>         alias           OMS 1
>>>         address         theip
>>>         parents         null
>>> }
>>>
>>> What I'd like to have the end resulting object be is:
>>>
>>> hostgroups rhg_A6, nhg_sec
>>> contact_groups cg_sec1
>>> notification_period 24x7
>>> no parents defined
>>>
>>> I end up with an object that has:
>>>
>>> hostgroups rhg_A6
>>> contact_groups cg_sec1
>>> notification_period 24x7
>>> parents SW-CAB_A6
>>>
>>> If I add a "hostgroups +nhg_sec" line to the last host then it doesn't 
>>> add
>>> nhg_sec to the hostgroups instead it replaces it and I end up with only
>>> nhg_sec.  However if I change the "use default,A6,24x7,sec" to "use
>>> A6,default,24x7,sec" then I do get both hostgroups listed.
>>>
>>> Hope this helps track down some potential issues,
>>>
>>> -Shad
>>>
>>
> [snip]
>>
>> The example config entries you provided offer another way to use
>> additive inheritance which would definitely be useful.  I'll work on
>> getting a patch into CVS in the next day or two to make that work.
>>
>> Thanks for the feedback and suggestions.
>>
>
> Following up to myself...  A patch is now in CVS which should support
> the configuration syntax you're looking for. :-)  Give it a try and let
> me know how it works.

Works exactly as expected.  Thank you very much.

-Shad 


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