Additive inheritance and canceling inheritance issues

Ethan Galstad nagios at nagios.org
Fri Oct 19 02:03:33 CEST 2007


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.


Ethan Galstad,
Nagios Developer
---
Email: nagios at nagios.org
Website: http://www.nagios.org

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