nagios-db-devel

[Nagios-db-devel] Retain State

[jl <jla...@em...>]

I've noticed that when nagios resetarts, nagios-db does not retain the 
current state.  I have set nagios to retain state, and verified that it 
does.  This creates some holes of 'unknown' for services that don't 
report very often.  Is there a way to make nagios-db retain state or is 
that a limitation of nagios?

jl

Re: [Nagios-db-devel] Retain State

[Ben <be...@si...>]

Well, a couple things. 

First, nagios-db does retain the last state. (In fact, there's really no
way not to retain state.) However, it doesn't use it for hosts and doesn't
trust it for services. This was intentional. If nagios has to restart,
there's no way to know what happened when it was down.

Second, there is a big difference between pending and unknown, at least 
when it comes to services.

So.... unlike the nagios CGIs, the nagios-db UI does the most accurate
thing it can: it a service had been up before restart, nagios-db marks the
host as "up and pending". It still sort counts as up, but it's untrusted,
because nagios may well have missed it going down.

If this doesn't work for you, why not?

On Thu, 24 Mar 2005, jl wrote:

> I've noticed that when nagios resetarts, nagios-db does not retain the 
> current state.  I have set nagios to retain state, and verified that it 
> does.  This creates some holes of 'unknown' for services that don't 
> report very often.  Is there a way to make nagios-db retain state or is 
> that a limitation of nagios?
> 
> jl
> 
> 
> 
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Re: [Nagios-db-devel] Retain State

[jl <jla...@em...>]

I guess I was more looking at services being marked as pending upon a 
nagios restart.  I have a bunch of services that only report back 
hourly (raid status and freespace as examples) that get marked as 
pending after a nagios restart.  We end up having to restart nagios a 
fair amount right now because of changes to our network and 'loose' the 
last state of those services until they report again.  Is there a way 
around this?

Sorry if I'm missing something obvious.

jl


On Mar 24, 2005, at 11:43 AM, Ben wrote:

> Well, a couple things.
>
> First, nagios-db does retain the last state. (In fact, there's really 
> no
> way not to retain state.) However, it doesn't use it for hosts and 
> doesn't
> trust it for services. This was intentional. If nagios has to restart,
> there's no way to know what happened when it was down.
>
> Second, there is a big difference between pending and unknown, at least
> when it comes to services.
>
> So.... unlike the nagios CGIs, the nagios-db UI does the most accurate
> thing it can: it a service had been up before restart, nagios-db marks 
> the
> host as "up and pending". It still sort counts as up, but it's 
> untrusted,
> because nagios may well have missed it going down.
>
> If this doesn't work for you, why not?
>
> On Thu, 24 Mar 2005, jl wrote:
>
>> I've noticed that when nagios resetarts, nagios-db does not retain the
>> current state.  I have set nagios to retain state, and verified that 
>> it
>> does.  This creates some holes of 'unknown' for services that don't
>> report very often.  Is there a way to make nagios-db retain state or 
>> is
>> that a limitation of nagios?
>>
>> jl
>>
>>
>>
>> -------------------------------------------------------
>> This SF.net email is sponsored by Microsoft Mobile & Embedded DevCon 
>> 2005
>> Attend MEDC 2005 May 9-12 in Vegas. Learn more about the latest 
>> Windows
>> Embedded(r) & Windows Mobile(tm) platforms, applications & content.  
>> Register
>> by 3/29 & save $300 
>> http://ads.osdn.com/?ad_id=6883&alloc_id=15149&op=click
>> _______________________________________________
>> Nagios-db-devel mailing list
>> Nag...@li...
>> https://lists.sourceforge.net/lists/listinfo/nagios-db-devel
>>
>
>

Re: [Nagios-db-devel] Retain State

[Ben <be...@si...>]

Hm, actually, come to think of it, I realized that everything I said in 
my first reply was kinda wrong. So ignore that. :)

Here's what nagios-db does. On a restart, all hosts and services are
marked as pending. Services will be checked as quickly as specified by
max_service_check_spread, and host checks will happen whenever nagios
thinks it needs them. Because Nagios doesn't do host checks that often, it
most hosts stay pending for quite some time. Nagios-DB strives to be
"correct", and so it says a check is pending if it really doesn't know
what the status is.

So, the short answer is, yes, nagios-db sees the previous state, but at 
the same time it ignores it. I had imagined that, in most environments, 
nagios will be run for long periods of time uninterrupted, and balanced 
the tradeoffs accordingly.

If you can't increase max_service_check_spread to something smaller, and
if you can't just live with things being pending until they're checked :),
then the data is in the database, but you'll have to hack some of the
stored procs and the php to mimic the CGI's implementation of state 
retention.

On Thu, 24 Mar 2005, jl wrote:

> I guess I was more looking at services being marked as pending upon a 
> nagios restart.  I have a bunch of services that only report back 
> hourly (raid status and freespace as examples) that get marked as 
> pending after a nagios restart.  We end up having to restart nagios a 
> fair amount right now because of changes to our network and 'loose' the 
> last state of those services until they report again.  Is there a way 
> around this?
> 
> Sorry if I'm missing something obvious.
> 
> jl
> 
> 
> On Mar 24, 2005, at 11:43 AM, Ben wrote:
> 
> > Well, a couple things.
> >
> > First, nagios-db does retain the last state. (In fact, there's really 
> > no
> > way not to retain state.) However, it doesn't use it for hosts and 
> > doesn't
> > trust it for services. This was intentional. If nagios has to restart,
> > there's no way to know what happened when it was down.
> >
> > Second, there is a big difference between pending and unknown, at least
> > when it comes to services.
> >
> > So.... unlike the nagios CGIs, the nagios-db UI does the most accurate
> > thing it can: it a service had been up before restart, nagios-db marks 
> > the
> > host as "up and pending". It still sort counts as up, but it's 
> > untrusted,
> > because nagios may well have missed it going down.
> >
> > If this doesn't work for you, why not?
> >
> > On Thu, 24 Mar 2005, jl wrote:
> >
> >> I've noticed that when nagios resetarts, nagios-db does not retain the
> >> current state.  I have set nagios to retain state, and verified that 
> >> it
> >> does.  This creates some holes of 'unknown' for services that don't
> >> report very often.  Is there a way to make nagios-db retain state or 
> >> is
> >> that a limitation of nagios?
> >>
> >> jl
> >>
> >>
> >>
> >> -------------------------------------------------------
> >> This SF.net email is sponsored by Microsoft Mobile & Embedded DevCon 
> >> 2005
> >> Attend MEDC 2005 May 9-12 in Vegas. Learn more about the latest 
> >> Windows
> >> Embedded(r) & Windows Mobile(tm) platforms, applications & content.  
> >> Register
> >> by 3/29 & save $300 
> >> http://ads.osdn.com/?ad_id=6883&alloc_id=15149&op=click
> >> _______________________________________________
> >> Nagios-db-devel mailing list
> >> Nag...@li...
> >> https://lists.sourceforge.net/lists/listinfo/nagios-db-devel
> >>
> >
> >
> 
> 
> 
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