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Describe how carp(4) status changes can be processed with

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help of devd(8).

Submitted by:	"Alexander V. Chernikov" <melifaro ipfw.ru>
Approved by:	re (kib)
This commit is contained in:
Gleb Smirnoff 2011-08-15 12:08:41 +00:00
parent 4b3a6fb933
commit cc8b2291de
1 changed files with 39 additions and 1 deletions
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40
share/man/man4/carp.4
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@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd January 5, 2010
.Dd August 15, 2011
.Dt CARP 4
.Os
.Sh NAME
@ -168,6 +168,25 @@ forwarded to its destination, and destination replying faster
than the state information is packed and synced with the second router.
If the reply would be load balanced to second router, it will be
dropped due to no state.
.Sh STATE CHANGE NOTIFICATIONS
Sometimes it is useful to get notified about
.Nm
status change events.
This can be accomplished by using
.Xr devd 8
hooks.
Master/slave events are signalled as
.Nm
interface
.Dv LINK_UP
or
.Dv LINK_DOWN
event.
Please see
.Xr devd.conf 5
and
.Sx EXAMPLES
section for more information.
.Sh EXAMPLES
For firewalls and routers with multiple interfaces, it is desirable to
failover all of the
@ -249,6 +268,25 @@ This way, locally connected systems will receive different ARP replies and
subsequent IP traffic will be balanced among the hosts.
If one of the hosts fails, the other will take over the virtual MAC address,
and begin answering ARP requests on its behalf.
.Pp
Processing of
.Nm
status change events can be set up by using the following devd.conf rules:
.Bd -literal -offset indent
notify 0 {
match "system" "IFNET";
match "type" "LINK_UP";
match "subsystem" "carp*";
action "/root/carpcontrol.sh $type $subsystem";
};
notify 0 {
match "system" "IFNET";
match "type" "LINK_UP";
match "subsystem" "carp*";
action "/root/carpcontrol.sh $type $subsystem";
};
.Ed
.Sh SEE ALSO
.Xr inet 4 ,
.Xr pfsync 4 ,