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Service correlation
Posted: Mon Dec 16, 2013 5:44 am
by _demo_
Hi
I'm looking for a simple solution to check the availability of my network connection.
What I am trying to do is something like check_http google.com
if google.com is reachable => network connection ok
if google.com is not reachable => network connection down
The Problem is that sometimes google.com itself is down
My solution would be to check
if google.com and yahoo.com (two websites) are not reachable => network connection down
How can I manage such kind of correlation in Nagios? I have just found
http://nagios.sourceforge.net/docs/nagi ... ncies.html
but I think this is from another perspective of view.
thanks in advance
Re: Service correlation
Posted: Mon Dec 16, 2013 10:40 am
by tmcdonald
I think
this might be what you're looking for.
Re: Service correlation
Posted: Tue Dec 17, 2013 6:08 am
by _demo_
Hm, but parents are relationships between physical hosts??
Within hosts.cfg I can only define hosts with a
required address Field.
How can I define "My Network" as a host with the Parents Google and Yahoo %-/ (confused)?
Code: Select all
define host{
use basic-host
host_name Internet
alias Internet
address ?????????????????????????????
parents Google,Yahoo
notifications_enabled 1
check_interval 5
retry_interval 1
max_check_attempts 2
}
define host{
use basic-host
host_name Google
alias Google
address google.com
check_command check-host-alive
notifications_enabled 0
check_interval 5
retry_interval 1
max_check_attempts 1
}
define host{
use basic-host
host_name Yahoo
alias Yahoo
address yahoo.com
check_command check-host-alive
notifications_enabled 0
check_interval 5
retry_interval 1
max_check_attempts 1
}
This dependency topic hosts vs services is really confusing me.
Re: Service correlation
Posted: Tue Dec 17, 2013 12:22 pm
by slansing
You would create hosts for google and yahoo, then assign them as parents to your current hosts with the "parent" configuration directive mentioned in tmcdonald's post.
Re: Service correlation
Posted: Wed Dec 18, 2013 6:31 am
by _demo_
But, I want Nagios to tell me that the Internet is down (because google and yahoo are unreachable)
I do not want Nagios to tells me that Host XY ist down because the Internet is down.
Hence I still think, that parent/child solution is not what I am searching for
Better would be a service on the Nagios Host that probes via something like check_http
Code: Select all
define service{
service_description www1
use active_service
host_name www.google.com
check_command check_http!/!2!5
notifications_enabled 0
}
define service{
service_description www2
use active_service
host_name www.yahoo.com
check_command check_http!/!2!5
notifications_enabled 0
}
But then I have do correlate this checks and I don't konw how to do this with Nagios
like
if www1 and www2 down then www critical
Re: Service correlation
Posted: Wed Dec 18, 2013 11:42 am
by lmiltchev
You can probably use the BPI - in can be used not only in Nagios XI but also in Nagios Core...
http://assets.nagios.com/downloads/nagi ... _Addon.pdf
You can create a BPI group "Internet" with two members - google and yahoo. If both members are down, then the Internet is down...