Nagios redundancy

[Steve Shipway]

> How Can I have redundancy in my nagios server?

We do it by having two servers, twin-tailed onto an external mirrored
SCSI disk pack, and then using Linux-HA to do failover between them with
a floating virtual IP and so on.  Works very well although both servers
need to be in the same physical location.  They also both have a local
unpublished secondary DNS server so that it minimises the load on the
central DNS and also protects against DNS failure.

Steve

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