' Need the big picture: Why "retention"?

Marc Powell marc at ena.com
Wed Jun 17 22:30:11 CEST 2009


On Jun 17, 2009, at 1:27 PM, Scott.Chapman at VerizonWireless.com wrote:

> I'm reading the Nagios docs (a rather long trip - thanks for the  
> great docs!)

Good deal... =)

> and I'm seeing plenty of references to retention.  I'm new to this  
> and it isn't clicking.
>
> Why would I want retention?
>
> What's it for?

Retention is useful in at least a couple of cases --
	- When nagios is restarted hosts and services are normally put into a  
PENDING state until they are actually checked again. With retention,  
information in the retention file will be used to set the initial  
status of hosts and services to the last known state. It makes  
restarts essentially transparent.
	- Several program-wide and host and service specific things can be  
changed via the GUI (whether checks are enabled, notifications are  
enabled, etc...). Without retention, those changes are reverted back  
to their config-file settings on restart. With retention, they are  
maintained seamlessly across restarts.

--
Marc


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