Le 06/07/2014 12:05, Otto Moerbeek a écrit :
> On Sun, Jul 06, 2014 at 10:59:16AM +0200, Janne Johansson wrote:
>
>> The sysctl for carp.preempt controls if they should all fail at the same
>> time.
>
> read carp(4). It contains answers to some questions asked.
>
> -Otto
>
>> Den 6 jul 2014 10:12 skrev "Adam Thompson" <athom...@athompso.net>:
>>> I recall someone pointing out that interface groups of carp interfaces
>>> will all transition simultaneously. I find ifconfig(8) inconclusive; run
>>> your own tests and if that works, you have a built-in solution for keeping
>>> all the carp interfaces in sync.
>>> Then, use ifstated to manage the pppoe interfaces depending on ifstate of
>>> the relevant wan interface? You could set up a carp interface with no IP
>>> address bound, set it into the common if group and it would go up/down with
>>> the other carp ifs.
>>> Maybe. I haven't tried anything like that myself.
>>> -Adam
I run some tests and this is working as expected!
Only thing I see is that there will be no group failback if this is a
virtual carp interface which goes down.
To be clear if the parent interface of carp2 goes down the whole group
will switch but not if carp2 goes down by itself (by an admin mistake
for example):
* initial states
root@obsd1:~# sysctl -a|grep preem
net.inet.carp.preempt=1
root@obsd1:~# ifconfig HA |grep status
status: master
status: master
status: master
status: master
root@obsd2:~# sysctl -a|grep preem
net.inet.carp.preempt=1
root@obsd2:~# ifconfig HA |grep status
status: backup
status: backup
status: backup
status: backup
* states with carp2 down on obsd1
root@obsd1:~# ifconfig carp2 down
root@obsd1:~# ifconfig HA |grep status
status: master
status: master
status: invalid
status: master
root@obsd2:~# ifconfig HA |grep status
status: backup
status: backup
status: master
status: backup
* also unfortunately when carp2 goes UP again on obsd1 it still remains
on obsd2:
root@obsd1:~# ifconfig carp2 up
root@obsd1:~# ifconfig HA |grep status
status: master
status: master
status: backup
status: master
root@obsd2:~# ifconfig HA |grep status
status: backup
status: backup
status: master
status: backup
Anyway I think this is an acceptable risk.
@Adam: I will now try to use ifstated to manage pppoe interfaces like
you suggest.
Thanks to everyone of you.
