Re: [Nagios-users] Host dependencies not being picked up...
On Jun 1, 2009, at 1:46 PM, Andrew Davis wrote: The bulk of my systems are behind one of three switches. I just went through my hosts.cfg file and added the parents line and appropriate switch name for each, but the host dependencies aren't showing up. Parents and host dependencies are not the same thing. parents is probably what you want and have configured correctly based on the information you've provided. Nagios doesn't count them for the summary. -- Marc -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null
Re: [Nagios-users] Host dependencies not being picked up...
Double-checking the docs I think I just realized this...
If I understand this right, the parents option is used for Nagios
itself (prehaps better re-worded as internally) to define the network
topology for the core host check. If the switch is down, it won't mark a
host as Down, only as Unreachable.
For a host dependency, I have to define something like this:
define hostdependency{
host_nameHost A
dependent_host_nameHost C
notification_failure_criteriad
}
define hostdependency{
host_nameHost B
dependent_host_nameHost C
notification_failure_criteriad,u
}
Am I understanding this right?
What gets me is that what Nagios seems to call a parent is, to me
anyway, a network/host dependency. Hosts are dependent on the network
and services are dependent on hosts. I guess I'm missing where a host
dependency would actually be of any value...
A. Davis
Email: ncc...@gmail.com
There is no limit to what a man can accomplish
if he doesn't care who gets the credit. - Ronald Reagan
Marc Powell wrote:
On Jun 1, 2009, at 1:46 PM, Andrew Davis wrote:
The bulk of my systems are behind one of three switches. I just went
through my hosts.cfg file and added the parents line and
appropriate switch name for each, but the host dependencies aren't
showing up.
Parents and host dependencies are not the same thing. parents is
probably what you want and have configured correctly based on the
information you've provided. Nagios doesn't count them for the summary.
--
Marc
--
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Re: [Nagios-users] Host dependencies not being picked up...
Andrew Davis wrote:
The bulk of my systems are behind one of three switches. I just went
through my hosts.cfg file and added the parents line and appropriate
switch name for each, but the host dependencies aren't showing up. I do
use a host template for most of the servers and then other specifics.
Below is a sample of what's defined. Initially I thought the issue was
the Nagios server being in the same switch as one of the switches, but
the last entry below shows a switch defined as a parent and the Nagios
server is not behind the switch (Nagios is behind flscrb234srvsw5, the
last host is behind flscrb234srvsw6). The VLAN is the same for all the
hosts in the three switches... all hosts operate on 10.1.1.x/16 or
10.1.80.x/16 which is all a single VLAN. I'd appreciate any thoughts on
why it might not be working:
*snip*
define host {
host_name flscrb234srvsw5
use Network-Switches
alias 4948-5 - B234
address 10.100.0.45
}
define host {
host_name flscrb234srvsw6
use Network-Switches
alias 4948-6 - B234
address 10.100.0.46
}
...
*snip*
define host {
host_name aten
use Linux-Servers
alias Aten (SLES)
address 10.1.80.3
parents flscrb234srvsw5
}
...
define host {
host_name delos
use Linux-Servers
alias Delos (CentOS)
address 10.1.1.93
parents flscrb234srvsw6
}
Reading configuration data...
Running pre-flight check on configuration data...
*snip*
*Checking host dependencies...
Checked 0 host dependencies.*
Host dependencies are not generated with the use of the parents
directive. Specifying parents allows you to create a topology for the
status map, and also to allow Nagios to detect a host as being
UNREACHABLE versus DOWN, if they are a child of another host. If you
want host (or service) dependencies, you must create dependency objects:
http://nagios.sourceforge.net/docs/3_0/dependencies.html
-Zack
--
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Re: [Nagios-users] Host dependencies not being picked up...
Andrew Davis wrote:
Double-checking the docs I think I just realized this...
If I understand this right, the parents option is used for Nagios
itself (prehaps better re-worded as internally) to define the network
topology for the core host check. If the switch is down, it won't mark a
host as Down, only as Unreachable.
For a host dependency, I have to define something like this:
define hostdependency{
host_nameHost A
dependent_host_nameHost C
notification_failure_criteriad
}
define hostdependency{
host_nameHost B
dependent_host_nameHost C
notification_failure_criteriad,u
}
Am I understanding this right?
What gets me is that what Nagios seems to call a parent is, to me
anyway, a network/host dependency. Hosts are dependent on the network
and services are dependent on hosts. I guess I'm missing where a host
dependency would actually be of any value...
Host dependencies aren't to be confused with parent/child relationships.
Parent/child relationships are what actually define the network topology.
Host dependencies are just for defining a dependency from host A to
from host B and so on. I'm not sure the usefulness of this, but I'm
sure someone uses it.
http://www.nagios.org/faqs/viewfaq.php?faq_id=145
Regards,
Max
--
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looking to deploy the next generation of Solaris that includes the latest
innovations from Sun and the OpenSource community. Download a copy and
enjoy capabilities such as Networking, Storage and Virtualization.
Go to: http://p.sf.net/sfu/opensolaris-get
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Re: [Nagios-users] Host dependencies not being picked up...
On Mon, Jun 1, 2009 at 3:43 PM, Max Hetrick maxhetr...@verizon.net wrote: Host dependencies aren't to be confused with parent/child relationships. Parent/child relationships are what actually define the network topology. Host dependencies are just for defining a dependency from host A to from host B and so on. I'm not sure the usefulness of this, but I'm sure someone uses it. http://www.nagios.org/faqs/viewfaq.php?faq_id=145 Regards, Max I could see the usefulness for remote sites, checking that a router is on a network, before scanning servers/clients inside the network. Obviously if the router is unreachable, you don't want to continue scanning that part of the network. Regards, -- Glen Barber FreeBSD Tutorials: http://www.dev-urandom.com -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null
Re: [Nagios-users] Host dependencies not being picked up...
On Jun 1, 2009, at 2:24 PM, Andrew Davis wrote:
Double-checking the docs I think I just realized this...
If I understand this right, the parents option is used for Nagios
itself (prehaps better re-worded as internally) to define the
network topology for the core host check. If the switch is down, it
won't mark a host as Down, only as Unreachable.
For a host dependency, I have to define something like this:
define hostdependency{
host_nameHost A
dependent_host_nameHost C
notification_failure_criteriad
}
Am I understanding this right?
Correct.
What gets me is that what Nagios seems to call a parent is, to me
anyway, a network/host dependency. Hosts are dependent on the
network and services are dependent on hosts. I guess I'm missing
where a host dependency would actually be of any value...
Yes, they are very similar... hostdependencies give you more
flexibility about when it's valid and under what conditions though.
Like you, I'm hard-pressed to come up with an example of when it's
actually interesting... I guess the best example I can think of based
on my understanding is if you have your nagios server on a different
LAN than two other servers. Server B is dependent on Server A for
functioning. If ServerA and ServerB are unreachable from nagios, that
may not be a big deal; they could still be providing services locally
just fine. If ServerA is down though, that's a different matter.
*shrug* I could be completely off base on that scenario ;) I don't use
dependencies G
--
Marc
--
OpenSolaris 2009.06 is a cutting edge operating system for enterprises
looking to deploy the next generation of Solaris that includes the latest
innovations from Sun and the OpenSource community. Download a copy and
enjoy capabilities such as Networking, Storage and Virtualization.
Go to: http://p.sf.net/sfu/opensolaris-get
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Re: [Nagios-users] Host dependencies not being picked up...
Marc Powell wrote: Yes, they are very similar... hostdependencies give you more flexibility about when it's valid and under what conditions though. Like you, I'm hard-pressed to come up with an example of when it's actually interesting... I guess the best example I can think of based on my understanding is if you have your nagios server on a different LAN than two other servers. Server B is dependent on Server A for functioning. If ServerA and ServerB are unreachable from nagios, that may not be a big deal; they could still be providing services locally just fine. If ServerA is down though, that's a different matter. *shrug* I could be completely off base on that scenario ;) I don't use dependencies G Ahh, yeah I guess that makes sense. I don't use them either, except for a few service dependencies. We have an i5 AS400 here where the services that we're checking are dependent on a login service. If you can't login, you can't check the services, but that doesn't mean that the other services are down. This is the only time I've ever needed to use host/service dependencies. I guess there are specific applications for the need of them. :) Regards, Max -- OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get ___ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null
