Service failover dependency

[Mike Lindsey]

On 4/7/11 2:45 AM, Andrey Mitroshin wrote:
> I'm afraid I did not explained my problem clearly.
>
> So, I've got 2 servers.
> serverA - primary (10.0.0.1)
> serverB - backup (10.1.0.1)
>
> There is some apache vhost named www.site.com configured on both of them.
> My failover is supposed to work as follows.
>
> Usually serverA is up and www.site.com resolves to 10.0.0.1.
> when serverA.com goes down, nagios executes evenhandler, updates A
> record  and www.site.com points to 10.1.0.1 (serverB).
>
> The problem arises when both servers are down. So, evenhandler updates
> A record of www.sites.com, but serverB is down as well
>
> My goal is to avoid executing eventhandler when serverB is down.
> And the question is how to configure such a behaviour in nagios.
What you need here, is a smarter event handler.  In the event handler 
script, have it test serverB.  If serverB is up, update the A record; 
otherwise just exit (and maybe update a logfile somewhere).

-- 
Mike Lindsey


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