Date: Sun, 05 Oct 2008 11:11:30 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: frank.cam@webprophets.net.au Cc: questions@freebsd.org Subject: Re: CARP issue with 2 Masters Message-ID: <48E892D2.6050409@infracaninophile.co.uk> In-Reply-To: <1223198445.48e886ede1ea7@webmail.webprophets.net.au> References: <1223198445.48e886ede1ea7@webmail.webprophets.net.au>
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frank.cam@webprophets.net.au wrote:
> I have CARP running on a master and a slave server and for some unknown=
reason=20
> the slave continues to classify itself as a master, even though the adv=
skew is=20
> higher than on the master.=20
> It appears that queries sent to the CARP ip address go to the master 50=
% of the=20
> time and the slave 50% of the time when both servers are up. This plays=
havoc=20
> with my databases as I synchronise them asynchronously.
>=20
> When I take the carp interface down on the slave using 'ifconfig carp0 =
down &&=20
> ifconfig carp0 up' it lists it's status as 'backup' for about 10 second=
s and=20
> then goes back to 'master'.
Have you by any chance firewalled out the multicast packets that CARP use=
s
to test for interface death? If either one of a CARP pair can't see CARP=
packets
frequently enough it will think the other is down and promote itself to m=
aster.
If your firewall is blocking, then add a rule like this on both machines:=
pass quick on $ext_if proto carp \
from $ext_if:network to $carp_mcast keep state
$carp_mcast is defined as "224.0.0.18"
Cheers,
Matthew
--=20
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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