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Date:      Wed, 13 May 2015 19:44:08 -0700
From:      motty cruz <motty.cruz@gmail.com>
To:        Konstantin Kukushkin <dark@rambler-co.ru>
Cc:        =?UTF-8?Q?Trond_Endrest=C3=B8l?= <Trond.Endrestol@fagskolen.gjovik.no>,  freebsd-questions@freebsd.org
Subject:   Re: Help! carp slave take over as master at boot!
Message-ID:  <CALoOYy4F5ycEx3iWLfPgboPrQKFHrg0+nhUD=7i2Vz145998kw@mail.gmail.com>
In-Reply-To: <5553CA79.60104@gmail.com>
References:  <55511AF3.3030408@gmail.com> <alpine.BSF.2.20.1505120742290.46962@mail.fig.ol.no> <CALoOYy6Tb3Pc2fLJFnQE+z85Mwc1_eSTYBD8T=j4vo-i8kCRmg@mail.gmail.com> <55531870.9060607@rambler-co.ru> <CALoOYy7doZusm6bWHtV7wkQaC4kkr6Sd-8vWxSLEvky04gwpDQ@mail.gmail.com> <5553C041.7050903@rambler-co.ru> <5553CA79.60104@gmail.com>

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it is possible to pause network connection on boot for 60 seconds? what I
meant, when a system boots up, allow no network connections for 60 seconds
after reboot.

is this possible?

Thanks,

On Wed, May 13, 2015 at 3:04 PM, Motty Cruz <motty.cruz@gmail.com> wrote:

> Thanks for your reply;
>
> I disabled preempt on both machines:
> # net.inet.carp.preempt=3D1
>
> # sysctl -a | grep "preempt"
> kern.sched.preemption: 1
> kern.sched.preempt_thresh: 80
> net.inet.carp.preempt: 0
>
> Machine B(slave) does take over as Master whenever Machine A(master) dies=
;
> However, when Machine A (master) boot up it takes over as Master; I would
> like for a Master to stay Master as long as it lives.
> Thanks,
> Motty
>
>
>
> On 05/13/2015 02:21 PM, Konstantin Kukushkin wrote:
>
>> 13.05.2015 20:58, motty cruz =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
>>
>>> Hello Konstantin
>>>
>>> This is a new setup; my goal is to have a redundant "file server"; if
>>> "Machine A(master) goes down or just reboot for any reason, I want
>>> Machine B(slave) to take over as Master and I want Machine (B slave) to
>>> stay Master when Machine A come back on-line.
>>>
>>> Here is what I have thus far:
>>> Machine A (master)
>>> ifconfig_igb0_alias0=3D"inet vhid 31 advbase 12 advskew 40 pass passwor=
d2
>>> 19.16.31.80/24 <http://19.16.31.80/24>"
>>>
>>> Machine B (slave)
>>> ifconfig_igb0_alias0=3D"inet vhid 31 advbase 12 advskew 80 pass passwor=
d2
>>> 19.16.31.80/24 <http://19.16.31.80/24>"
>>> both machines: /etc/sysctl.conf
>>> # net.inet.carp.preempt=3D1
>>>
>>> (Machine A ) /etc/devd.conf
>>> ##### Check status of CARP interface ########
>>> notify 5 {
>>>                     match "system"          "CARP";
>>>                     match "subsystem"       "[0-9]+@[0-9a-z]+";
>>>                     match "type"            "(MASTER)";
>>>                     action "/usr/local/sbin/startmaster.pl
>>> <http://startmaster.pl>";
>>> };
>>>
>>> notify 5 {
>>>          match "system"          "CARP";
>>>          match "type"            "[0-9]+@[0-9a-z]+";
>>>          match "subsystem"       "(BACKUP)";
>>>          action "/usr/local/sbin/slave.sh";
>>> };
>>>
>>>
>>> (Machine B) /etc/devd.conf
>>> ### Check status of CARP interface  ###
>>> notify 5 {
>>>                     match "system"          "CARP";
>>>                     match "subsystem"       "[0-9]+@[0-9a-z]+";
>>>                     match "type"            "(MASTER)";
>>>                     action "/usr/local/sbin/startmaster.pl
>>> <http://startmaster.pl>";
>>> };
>>>
>>>
>>>
>>> notify 5 {
>>>          match "system"          "CARP";
>>>          match "type"            "[0-9]+@[0-9a-z]+";
>>>          match "subsystem"       "(BACKUP)";
>>>          action "/usr/local/sbin/slave.sh";
>>> };
>>>
>>> if Master machine reboots, I want slave to take over as Master and stay
>>> Master even after Machine with lowest advskew come back online.
>>>
>>> any ideas?
>>>
>>
>> If you want address switched only if neighbour is died you need to take
>> carp preemtion off, i.e. net.inet.carp.preempt=3D0 on both machines.
>> Explanation from carp(4):
>> 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 announc=
ing
>> itself with a lower advskew.  Disabled by default.
>>
>> Enabling this option need for setup where one server main and another
>> server for fallback, working if (and only if) main server is died.
>>
>> Pay attention that carp detect that neighbour is died if 3 packet was
>> lost, so on your setup "switch" time will be between 36 and 48 seconds.
>>
>>  Thanks,
>>> Motty
>>>
>>>
>>>
>>> On Wed, May 13, 2015 at 2:25 AM, Konstantin Kukushkin
>>> <dark@rambler-co.ru <mailto:dark@rambler-co.ru>> wrote:
>>>
>>>     13.05.2015 04:19, motty cruz =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
>>>
>>>         Hi thanks for your reply;
>>>
>>>         Machine A (master)
>>>         ifconfig_igb0_alias0=3D"inet vhid 31 advbase 12 advskew 40 pass
>>>         password2
>>>         19.16.31.80/24 <http://19.16.31.80/24>"
>>>
>>>         Machine B (slave)
>>>         ifconfig_igb0_alias0=3D"inet vhid 31 advbase 12 advskew 80 pass
>>>         password2
>>>         19.16.31.80/24 <http://19.16.31.80/24>"
>>>
>>>         if I reboot slave, on boot it takes over as Master, any idea wh=
y?
>>>         both machines: /etc/sysctl.conf
>>>         # net.inet.carp.preempt=3D1
>>>
>>>
>>>     I don't understand master was rebooted so check runtime
>>>     configuration of sysctl net.inet.carp.preempt on master.
>>>     Check also /var/log/messages on both computers, sysctl
>>>     net.inet.carp.demotion on master (CARP may be demoted due to
>>>     interface/pfsync errors. CARP with preemption may be demoted also b=
y
>>>     down any other interface with CARP on the system).
>>>     Check firewall on slave, may be it block ingress packets from maste=
r.
>>>
>>>
>>>         On Mon, May 11, 2015 at 10:45 PM, Trond Endrest=C3=B8l <
>>>         Trond.Endrestol@fagskolen.gjovik.no
>>>         <mailto:Trond.Endrestol@fagskolen.gjovik.no>> wrote:
>>>
>>>             On Mon, 11 May 2015 14:11-0700, Motty Cruz wrote:
>>>
>>>                 Hello, I have two machines running FreeBSD 10.1 Release=
.
>>>                 Machine A is the
>>>                 master in Carp with advskew 20 and Machine B slave with
>>>                 advskew 200 both
>>>
>>>             are
>>>
>>>                 set to advbase 10. however, slave machine becomes Maste=
r
>>>                 on boot;
>>>
>>>                 my questions is, how do I configure both machines so if
>>>                 reboot any of the
>>>                 machines whatever machine is Master stays master if
>>>                 secondary machine
>>>
>>>             reboot.
>>>
>>>             You should augment your posting with facts. You may withhol=
d
>>> any
>>>             sensitive information such as IP addresses, but a copy of
>>>             the relevant
>>>             lines from /etc/rc.conf and /etc/sysctl.conf would be
>>> helpful.
>>>
>>>             Have you tried setting:
>>>
>>>             net.inet.carp.preempt=3D1
>>>
>>>             in /etc/sysctl.conf?
>>>
>>>             Try the command:
>>>
>>>             sysctl net.inet.carp.preempt=3D1
>>>
>>>             to see any immediate effect.
>>>
>>>             --
>>> +-------------------------------+------------------------------------+
>>>             | Vennlig hilsen,               | Best regards,
>>>                      |
>>>             | Trond Endrest=C3=B8l,              | Trond Endrest=C3=B8l=
,
>>>                       |
>>>             | IT-ansvarlig,                 | System administrator,
>>>                      |
>>>             | Fagskolen Innlandet,          | Gj=C3=B8vik Technical Col=
lege,
>>>             Norway,  |
>>>             | tlf. mob.   952 62 567,       | Cellular...: +47 952 62
>>>             567 <tel:%2B47%20952%2062%20567>,       |
>>>             | sentralbord 61 14 54 00.      | Switchboard: +47 61 14 54
>>>             00 <tel:%2B47%2061%2014%2054%2000>.      |
>>> +-------------------------------+------------------------------------+
>>>
>>>
>>>
>>>     --
>>>     =D0=A1 =D1=83=D0=B2=D0=B0=D0=B6=D0=B5=D0=BD=D0=B8=D0=B5=D0=BC, =D0=
=9A=D0=BE=D0=BD=D1=81=D1=82=D0=B0=D0=BD=D1=82=D0=B8=D0=BD =D0=9A=D1=83=D0=
=BA=D1=83=D1=88=D0=BA=D0=B8=D0=BD,
>>>     Rambler Internet Holding
>>>     mailto:dark@rambler-co.ru <mailto:dark@rambler-co.ru>
>>>     =D1=82=D0=B5=D0=BB.: 8 (495) 785-17-00#2129
>>>
>>>
>>>
>>>
>>> --
>>> Thanks for your support,
>>> Motty
>>>
>>
>>
>>
>


--=20
Thanks for your support,
Motty



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