Failover nagios server

[Andrew V. Chertolyas]

Steve Shipway wrote:
>>I have a standalone server with nagios running on it. I want 
>>to tune up an another server, for distributed monitoring. But 
>>main task is to provide for failover work of allover nagios 
>>configuration - in case of failure of one of the servers 
>>another server must provide data collection from all 
>>monitoring servers. Is there any solutions for it?
> 
> 
> We have such a setup here.
> 
> I have two Linux servers, each with 2 network cards and one Adaptec
> serveraid card.  There is an external SCSI disk unit, connected to BOTH
> server's SCSI cards, with a pair of disks configured in mirror.  The servers
> are joined by a crossed ethernet cable on the second network card.  The
> primary network card of each is on the network.
> 
> I have installed linux-HA on both servers, and have a service group
> consisting of a virtual IP, the filesystem on the external disk, and the
> nagios service.  This is set to failover between servers, with one server
> being the primary home with autofailback.
> 
> (Actually, there is also a mysql database on the nagios server, plus the
> BigBrother/Nagios gateway and a couple of other services, and the other
> server normally runs our MRTG setup on a separate filesystem, but this is
> just extra)
> 
> Since the Adaptec Serveraid natively supports this configuration, it works
> very well with linux-HA and the failover goes nicely.  The only thing to add
> is some cleanup code so that, if server1 dies, then server2 picks up the
> filesystem and needs to delete any Nagios.cmd pipe that may have been left
> lying around before starting.
> 
> This was surprisingly easy to set up, once the Raid config had been done.
> Thereis a bitof problem with how to define 'down' -- if the network
> interface 1 is down (so people cannot see Nagios) but interface 2 is up (so
> the heartbeat still works) should it fail over?  I would say no.  You should
> also send the heartbeat over the crossed ethernet cable, since otherwise a
> switch going down would make the 2 servers fight over the services (but
> thanks to the serveraid having internal locking, youll never get both
> accessing the filesystem at once and corrupting data)
> 
> Steve

Thank you!

--
WBR, Andrew V. Chertolyas


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