Date: Thu, 01 Jan 2015 22:29:05 +1100 From: Aristedes Maniatis <ari@ish.com.au> To: freebsd-net@freebsd.org Cc: Freddie Cash <fjwcash@gmail.com> Subject: Re: CARP vhid: across interfaces? Message-ID: <54A52F81.4080409@ish.com.au> In-Reply-To: <CAOjFWZ7rWN1RA8zwOC60FUNbGmb3oaPto8ALbKXqPbNnuV_nuA@mail.gmail.com> References: <54A52966.9040407@ish.com.au> <CAOjFWZ7rWN1RA8zwOC60FUNbGmb3oaPto8ALbKXqPbNnuV_nuA@mail.gmail.com>
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On 1/01/2015 10:22pm, Freddie Cash wrote:
> There's a sysctl specifically for this. Not at my computer right now, but the following should make it jump out at you:
>
> # sysctl -d | grep carp
I'm guessing this one (from the openBSD docs)...
net.inet.carp.preempt
Allow hosts within a redundancy group that have a better advbase and advskew to preempt the master. In addition, this option also enables failing over a group of interfaces together in the event that one interface goes down. If one physical CARP-enabled interface goes down, CARP will increase the demotion counter, carpdemote, by 1 on interface groups that the carp(4) interface is a member of, in effect causing all group members to fail-over together. net.inet.carp.preempt is 0 (disabled) by default.
But the FreeBSD man page doesn't talk about carpdemote
net.inet.carp.preempt Allow virtual hosts to preempt each
other. When enabled, a vhid in a
backup state would preempt a master
that is announcing itself with a
lower advskew. Disabled by
default.
At any rate what does "interface groups that the carp(4) interface is a member of" mean?
Freddie, thanks for pointing me to this setting. Maybe the answer is in the somewhere.
Ari
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Aristedes Maniatis
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