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Date: Mon, 7 Aug 2006 12:30:47 +0400
From: Igor Robul <igorr@speechpro.com>
To: freebsd-questions@freebsd.org
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Subject: Re: Reducing the timeout on a TCP connection
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On Tue, Aug 01, 2006 at 03:21:07PM -0400, Bill Moran wrote:
> In response to "Ted Mittelstaedt" <tedm@toybox.placo.com>:
> 
> > This is why the snmp protocol uses UDP, Bill.
> > 
> > You need to use something other than TCP for
> > monitoring.
> 
> Well ... if I'm monitoring a server that uses TCP (PostgreSQL) I can't
> rightly establish whether or not it's successfully accepting connections
> unless I used TCP as well.
> 
> I understand where you're coming from, but I can't see how I can use
> UDP to solve my problem.
You can do 2-step monitoring:
 1) Monitor1 monitors PostgreSQL via Unix domain socket, possible also
    it monitors presense of postmaster process
 2) Monitor2 monitors Monitor1 and you "connect" to Monitor2  via UDP.