Re: [Nagios-devel] Database access via Nagios
Posted: Thu Mar 18, 2010 11:09 am
On 03/16/2010 07:04 PM, Max wrote:
> Ninja reads Nagios information from the database tables created by
> Merlin, which has both a NEB module and a daemon (merlind) that reads
> from / writes to the NEB module.
>
A partial truth. Ninja also uses the data stored by reports-module.
Reports-module will be made redundant and its features incorporated
into Merlin at a later stage, but since the reports-module is very
widely tested we've decided to forgo including this feature in
Merlin for the time being.
> The Merlin database schema is very similar to the NDO database schema
> with the addition of some fields to allow for multiple merlin daemons
> to write to a single database (TBD - currently the daemons all use the
> same hardcoded instance ID in the DB).
>
This isn't true at all though. Merlin's object storage model is a lot
simpler than that of [ni]doutils. We made it that way since this made
it possible to write simpler and much more efficient queries for it,
with the added bonus of being a lot easier to understand.
Some basic testing showed that the ndoutils schema did not scale
linearly with the number of objects monitored. Merlin's schema does.
--
Andreas Ericsson [email protected]
OP5 AB www.op5.se
Tel: +46 8-230225 Fax: +46 8-230231
Considering the successes of the wars on alcohol, poverty, drugs and
terror, I think we should give some serious thought to declaring war
on peace.
This post was automatically imported from historical nagios-devel mailing list archives
Original poster: [email protected]
> Ninja reads Nagios information from the database tables created by
> Merlin, which has both a NEB module and a daemon (merlind) that reads
> from / writes to the NEB module.
>
A partial truth. Ninja also uses the data stored by reports-module.
Reports-module will be made redundant and its features incorporated
into Merlin at a later stage, but since the reports-module is very
widely tested we've decided to forgo including this feature in
Merlin for the time being.
> The Merlin database schema is very similar to the NDO database schema
> with the addition of some fields to allow for multiple merlin daemons
> to write to a single database (TBD - currently the daemons all use the
> same hardcoded instance ID in the DB).
>
This isn't true at all though. Merlin's object storage model is a lot
simpler than that of [ni]doutils. We made it that way since this made
it possible to write simpler and much more efficient queries for it,
with the added bonus of being a lot easier to understand.
Some basic testing showed that the ndoutils schema did not scale
linearly with the number of objects monitored. Merlin's schema does.
--
Andreas Ericsson [email protected]
OP5 AB www.op5.se
Tel: +46 8-230225 Fax: +46 8-230231
Considering the successes of the wars on alcohol, poverty, drugs and
terror, I think we should give some serious thought to declaring war
on peace.
This post was automatically imported from historical nagios-devel mailing list archives
Original poster: [email protected]