service dependency

[Neil]

Also guys, please read my previous post too. I am really confused now. 

Let say we 2 servers, svr-A running apache-svc and svr-B running mysql-svc. 

Assuming that apache-svc on svr-A is dependent on mysql-svc on svr-B.
Tell me if I understood servicedependency here. 

1. What I want to happen is that when mysql-svc on svr-B fails, I would like 
to get notified that apache-svc on svr-A will not work properly too.
2. I was also thinking that in the Service Detail(left pane of the nagios 
monitor webpage), the dependent host will have a different color on the 
dependent service if the depended upon service is down. 

Maybe a simple matrix will help me much more to understand 
servicedependency. 

Since I am really confused, what is the purpose of servicedependency? Is it 
to prevent email notifications when the dependend upon service is down? Or 
is it to prevent email notifications when the dependent service is down? 

Please bear with me for now :) 

Neil 

Hu Thomas Pan writes: 

> Service dependency could be across machines or within one machine. Use
> George's case. Suppose George's web application is dependent on database.
> The central database is a remote Oracle one. Certain amount of data is
> cashed locally on the same boxy using MySQL. If local MySQL is down, HTTP is
> down. If remote Oracle database is down, local HTTP is down. 
> 
> If I am wrong, please correct me. Currently, dependency only supports
> multiple to multiple relationship. It doesn't support one to one well, which
> means that I have to write one dependency for each of one-to-one dependency. 
> 
> 
> Best,
> Thomas 
> 
> 
> -----Original Message-----
> From: George Miscioscia [mailto:George.Miscioscia at Ticketmaster.com] 
> Sent: Tuesday, January 27, 2004 4:28 PM
> To: 'Neil'; Hu Thomas Pan
> Cc: nagios-users at lists.sourceforge.net
> Subject: RE: [Nagios-users] Re: service dependency 
> 
> Service dependancy: 
> 
> HTTP is some cases is dependant on Oracle or MySQL.  DB failure can cause
> HTTP checks to fail.  I see this all the time and have not come up with a
> solution. 
> 
> -----Original Message-----
> From: Neil [mailto:neil-on-nagios at restricted.dyndns.org]
> Sent: Monday, January 26, 2004 8:44 PM
> To: Hu Thomas Pan
> Cc: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] Re: service dependency 
> 
> 
> Additional:  
> 
> Can someone site me an example of an application that has service 
> dependency? With this, I can have an idea what service dependency is. And 
> also, I will be able to easily figure out our applications if there are 
> service dependencies.  
> 
> Thanks too.  
> 
> Ronneil  
> 
> Hu Thomas Pan writes:  
> 
>> Hi,  
>> 
>> I have a question on service dependency. I have a group of hosts -
>> hostsgroup_a. Each of them runs two services: service_a and service_b.
>> Service service_a is dependent on service service_b on each host. There is
>> no dependency across hosts.  
>> 
>> Could I define service dependency as the following?  
>> 
>> Define servicedependency {
>> 	hostgroup_name		hostsgroup_a
>>       service_description	service_a
>> 	hostgroup_name		hostsgroup_a
>> 	service_description	service_b
>> 	......
>> }  
>> 
>> Or, I still have to define each host per servicedependency?  
>> 
>> 
>> Best,
>> Thomas  
>> 
>>   
>> 
>> 
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> 
> 
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> 
 


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