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Change examples to have master skew above 0 to have ability to overwrite this

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from the slave (for example, when master is failing on disk IO and could not be
logged into or execute cronjob).

Commented out examples changed too to simplify future merging.

Idea by:	kaa@zvuki.ru
Discussed with:	glebius
MFC after:	1 week
This commit is contained in:
Dmitry Morozovsky 2014-05-29 21:02:57 +00:00
parent 8bc9a079ef
commit da4d5bb79b
1 changed files with 10 additions and 9 deletions
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19
share/man/man4/carp.4
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@ -210,17 +210,18 @@ Enable it on both hosts A and B:
.Pp
Assume that host A is the preferred master and we are running the
192.168.1.0/24 prefix on em0 and 192.168.2.0/24 on em1.
This is the setup for host A:
This is the setup for host A (advskew is above 0 so it could be overwritten
in the emergency situation from the other host):
.Bd -literal -offset indent
ifconfig em0 vhid 1 pass mekmitasdigoat 192.168.1.1/24
ifconfig em1 vhid 2 pass mekmitasdigoat 192.168.2.1/24
ifconfig em0 vhid 1 advskew 100 pass mekmitasdigoat 192.168.1.1/24
ifconfig em1 vhid 2 advskew 100 pass mekmitasdigoat 192.168.2.1/24
.Ed
.Pp
The setup for host B is identical, but it has a higher
.Cm advskew :
.Bd -literal -offset indent
ifconfig em0 vhid 1 advskew 100 pass mekmitasdigoat 192.168.1.1/24
ifconfig em1 vhid 2 advskew 100 pass mekmitasdigoat 192.168.2.1/24
ifconfig em0 vhid 1 advskew 200 pass mekmitasdigoat 192.168.1.1/24
ifconfig em1 vhid 2 advskew 200 pass mekmitasdigoat 192.168.2.1/24
.Ed
.Pp
When one of the physical interfaces of host A fails,
@ -246,9 +247,9 @@ preempt host A on both interfaces instead of just the failed one.
.\"out slightly less frequently.
.\".Bd -literal -offset indent
.\"ifconfig carp0 create
.\"ifconfig carp0 vhid 1 pass mekmitasdigoat 192.168.1.10/24
.\"ifconfig carp0 vhid 1 advskew 100 pass mekmitasdigoat 192.168.1.10/24
.\"ifconfig carp1 create
.\"ifconfig carp1 vhid 2 advskew 100 pass mekmitasdigoat 192.168.1.10/24
.\"ifconfig carp1 vhid 2 advskew 200 pass mekmitasdigoat 192.168.1.10/24
.\".Ed
.\".Pp
.\"The configuration for host B is identical, except the
@ -256,9 +257,9 @@ preempt host A on both interfaces instead of just the failed one.
.\"is on virtual host 1 rather than virtual host 2.
.\".Bd -literal -offset indent
.\"ifconfig carp0 create
.\"ifconfig carp0 vhid 1 advskew 100 pass mekmitasdigoat 192.168.1.10/24
.\"ifconfig carp0 vhid 1 advskew 200 pass mekmitasdigoat 192.168.1.10/24
.\"ifconfig carp1 create
.\"ifconfig carp1 vhid 2 pass mekmitasdigoat 192.168.1.10/24
.\"ifconfig carp1 vhid 2 advskew 100 pass mekmitasdigoat 192.168.1.10/24
.\".Ed
.\".Pp
.\"Finally, the ARP balancing feature must be enabled on both hosts: