Nagios cluster

[karl.kornel at mindspeed.com]

I use Ubuntu 6.06 LTS (Dapper Drake), Nagios 2.5 and MySQL 4.whatever.  I 
am using clustering.  My main hardware is a Compaq DL580; the backup 
machine is a virtual machine running on an ESX.  I use the Linux-HA 
clustering system (made available in Ubuntu through the 'heartbeat' 
package) to fail Nagios over from the main machine to the backup machine 
when something goes wrong*.  I have a single Nagios installation, which 
lives on a network-shared disk (using DRBD).  The database also lives on 
the shared disk.  I also take advantage of Linux-HA's IP address takeover 
scripts, so 'nagios.example.com' just needs to point to one IP address, 
which the heartbeat package automatically brings up on the active machine.

With this setup, I only need to configure a single Nagios instance.  There 
have been several times when the main machine failed (bad SCSI card), and 
in all cases the backup node took over with no problems (it helps that my 
MySQL databases all use InnoDB tables; I don't know how well MyISAM tables 
would fare).  This setup works very well for me, but your situation may be 
different.  Do you have a need for two Nagios instances, both monitoring 
the same hosts/services, to be active at once?

-- A. Karl Kornel, Mindspeed Technologies, Inc.
karl.kornel at mindspeed.com -- (949) 579-3503
"Remember the Rules: Separation & Optimization"

* Yes, I know that having a virtual machine as one machine makes the 
split-brain syndrome possible, since I don't have a serial connection 
between the two.  I'm dealing with it.

nagios-users-bounces at lists.sourceforge.net wrote on 11/19/2006 01:47:32 
PM:

> 
> 
> I have two servers (server A and Server B) running Nagios 2.5 with 
> mysql backend on Suse enterprise 10, I would like to cluster my 
> Nagios 2.5, so Administrators can add hosts or delete on either 
> Server A or Server B
> and the changes would replicate to the other server.
> 
> 
> I would also like both of my Nagios servers (server A
> and server B) to monitor clients but only one nagios sever will send out
> notifications at a time.  If server A
> goes down, server B take over the sending notification. And if 
> server B goes down
> take over sending notification.
> 
> 
> 
> 
> 
> How can I solve this problem? Any ideas? please
> 
> 
> Can you help? Please


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