[Xymon] Purple storm

[Poppy, Ben]

So they are pointing to 2 DC's that stay up this entire time, we'll call them DC1 and DC2. Then we shutdown DR-DC3 and DR-DC4. When those servers are down, we begin to have issues.

-----Original Message-----
From: Jeremy Laidman [mailto:jlaidman at rebel-it.com.au] 
Sent: Monday, March 19, 2012 7:46 PM
To: Poppy, Ben
Cc: xymon at xymon.com
Subject: Re: [Xymon] Purple storm

On Tue, Mar 20, 2012 at 5:15 AM, Poppy, Ben <poppy.ben at marshfieldclinic.org> wrote:
> I have an interesting problem that happened last night. We are working 
> on a DR test. Part of that test includes shutting down some DC's in 
> our DR datacenter. When that happened, most tests that are initiated 
> from the xymon servers (http, dns, ssh, ftp, etc) to the monitored server went purple.

For network tests, Xymon resolves the IP address from the servername (typically using DNS), and then uses that IP address to perform the test.  The IP address in the hosts.cfg file is not normally used for network tests.  So if your DNS fails, Xymon's network tests fail also.

You can prevent this, and use the IP address supplied in hosts.cfg, by adding "testip" to each hosts.cfg entry that requires it.  You can add it to a ".default." entry so that it applies to all hosts.

J

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