Problem with regular expressions and hostgroup_name in a hostgroup definition

[John A. Sullivan III]

On Fri, 2008-01-25 at 13:17 +0100, Jacobo García wrote:
> I want to define several hostgroups (for many virtual hosts) that belong
> to the same hostgroup called website:
> 
> define hostgroup{
>         hostgroup_name   websites
>         alias            All Web Sites
>         hostgroup_members ^.*-websites$
>         }
> 
> define hostgroup{
>         hostgroup_name  voc-websites
>         alias           Voc Web Sites
>         }
> 
> define hostgroup{
>         hostgroup_name  tck-websites
>         alias           TCK Web Sites
>         }
> 
> 
> And then define a service that uses the parent hostgroup (website):
> 
>  define service{
>         ; The 'name' of this service template, referenced in other
> service definitions
>         name                            sites-service
>         use                             generic-service
>         service_description             Sites-service
>         is_volatile                     0
>         check_period                    24x7
>         max_check_attempts              4
>         normal_check_interval           5
>         retry_check_interval            1
>         contact_groups                  admins
>         notification_options            w,u,c,r
>         notification_interval           960
>         notification_period             24x7
>         check_command                   check_http_path!/
>         register                        0       ; DONT REGISTER THIS
> DEFINITION - ITS NOT A REAL SERVICE, JUST A TEMPLATE!
>         hostgroup_name                  websites
>    }
> 
> 
> Of course I have regexp enabled in nagios.cfg
> 
> 
> # REGULAR EXPRESSION MATCHING
> use_regexp_matching=0
> 
> # "TRUE" REGULAR EXPRESSION MATCHING
> use_true_regexp_matching=1
> 
> 
> But this setup does not work as intended, i get the following errors
> when running:
> 
> $ sudo /usr/local/nagios/bin/nagios -v /etc/nagios3/nagios.cfg
> 
> 
> Reading configuration data...
> 
> Error: Could not find any hostgroup matching '^.*-websites$' (config
> file '/etc/nagios3/objects/main/hostgroups.cfg', starting on line 33)
> Error: Could not expand member hosts specified in hostgroup (config file
> '/etc/nagios3/objects/main/hostgroups.cfg', starting on line 33)
> 
> ***> One or more problems was encountered while processing the config
> files...
> 
> 
> I am using nagios 3.0 rc1 compiled in ubuntu from sources as explained
> in quickstart guide.
> 
> What I am missing?
> 
> Thanks for your time in advance
<snip>
We use Nagios regular expressions heavily to monitor our microperimeter
network security setup using ISCS (http://iscs.sourceforge.net).  We
have found that more complex regular expressions don't work. e.g., 

dependent_service_description   ^Tun.*-\(?:Chattanooga|Midlothian\)$

But simple ones like yours do, e.g., 

dependent_service_description   ^Tun.*-Midlothian$

I believe your problem is that you must set
use_regexp_matching=1
to use regular expressions at all.  We keep 
use_true_regexp_matching=0
because we do not want simple strings being misinterpreted as regular
expressions.

Hope this helps - John

-- 
John A. Sullivan III
Open Source Development Corporation
+1 207-985-7880
jsullivan at opensourcedevel.com

Financially sustainable open source development
http://www.opensourcedevel.com



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