From owner-freebsd-questions@freebsd.org Thu Dec 10 19:28:09 2015 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 2C8409D6C8C for ; Thu, 10 Dec 2015 19:28:09 +0000 (UTC) (envelope-from terje@elde.net) Received: from rand.keepquiet.net (keepquiet.net [144.76.43.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "keepquiet.net", Issuer "COMODO RSA Domain Validation Secure Server CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id E9B7A1CF5 for ; Thu, 10 Dec 2015 19:28:08 +0000 (UTC) (envelope-from terje@elde.net) Received: from [10.130.11.109] (cm-84.210.87.28.getinternet.no [84.210.87.28]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: terje@elde.net) by rand.keepquiet.net (Postfix) with ESMTPSA id D90A0B1F; Thu, 10 Dec 2015 19:27:58 +0000 (UTC) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (1.0) Subject: Re: CARP demotion counter From: Terje Elde X-Mailer: iPhone Mail (13C75) In-Reply-To: Date: Thu, 10 Dec 2015 20:27:56 +0100 Cc: freebsd-questions@freebsd.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <20151210182821.GM13477@mordor.lan> To: Emmanuel Vadot X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Dec 2015 19:28:09 -0000 > On 10 Dec 2015, at 20:00, Emmanuel Vadot wrote: >=20 > You need net.inet.carp.preempt=3D1 for MASTER returning to MASTER after a B= ACKUP state. If all things are otherwise equal, I've come to favor having redundant equip= ment not be designated master/slave, but rather "router 1" and "router 2" et= c, where possible.=20 It reduced "oh, the other is just backup"-impulses, promotes caring equally f= or either box, and reduces the idea of failover and fallback being separate t= hings.=20 Also removes "we need to fail back to the master" as a thing to do after a f= ailover, while the equality makes it easier to do changes as a matter of rou= tine.=20 Terje