redundancy

[Steve Shipway]

>I've got a HA failover cluster on Linux for LPRng, I've 
>considered seeing how Nagios runs in such a configuration.
>
>With the Heartbeat projects clustering, the IP address for the 
>Master server can switch between systems. However, the logging 
>and all wouldn't be up to date without something like DRBD.

We have a setup about to be created here using Linux HA to make a fuly
redundant Nagios server.  The setup uses an external SCSI disk pack to have
filesystems moving betweens servers.

ServerA -> disk pack <- ServerB(Nagios process)(drive mounted)
   |                       |(virtual IP)
---+-----------Network-----+-----

Linux HA on the servers passes the IP addresse between them, and also a
filesystem on a mirrored pair of SCSI disks which are visible to both
servers, but only mounted by the active one.  Linux HA will also start/stop
the Nagios process when a handover occurs.

In addition, the server *not* running Nagios will have an MRTG/RRD/routers2
installation which also has a separate mirrored disk pair to be passed back
and forth.

In remote sites, we will have a smaller pair of Nagios servers that do not
need the shared disk pack since they send all alerts back to the central
Nagios via NSCA.  This should achieve a high level of reliability and
redundancy, expandability, and minimise the about of times the individual
agents need to be queried (previously, we had two identical
simultaneously-running systems).

I'll post here in a few months if people are interested to let you all know
how well it ends up working out!

Steve



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