Help! carp slave take over as master at boot!
motty cruz
motty.cruz at gmail.com
Thu May 14 02:44:11 UTC 2015
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 at gmail.com> wrote:
> Thanks for your reply;
>
> I disabled preempt on both machines:
> # net.inet.carp.preempt=1
>
> # 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 пишет:
>>
>>> 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="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="inet vhid 31 advbase 12 advskew 80 pass password2
>>> 19.16.31.80/24 <http://19.16.31.80/24>"
>>> both machines: /etc/sysctl.conf
>>> # net.inet.carp.preempt=1
>>>
>>> (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=0 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 announcing
>> 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 at rambler-co.ru <mailto:dark at rambler-co.ru>> wrote:
>>>
>>> 13.05.2015 04:19, motty cruz пишет:
>>>
>>> Hi thanks for your reply;
>>>
>>> Machine A (master)
>>> ifconfig_igb0_alias0="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="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 why?
>>> both machines: /etc/sysctl.conf
>>> # net.inet.carp.preempt=1
>>>
>>>
>>> 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 by
>>> down any other interface with CARP on the system).
>>> Check firewall on slave, may be it block ingress packets from master.
>>>
>>>
>>> On Mon, May 11, 2015 at 10:45 PM, Trond Endrestøl <
>>> Trond.Endrestol at fagskolen.gjovik.no
>>> <mailto:Trond.Endrestol at 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 Master
>>> 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 withhold
>>> 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=1
>>>
>>> in /etc/sysctl.conf?
>>>
>>> Try the command:
>>>
>>> sysctl net.inet.carp.preempt=1
>>>
>>> to see any immediate effect.
>>>
>>> --
>>> +-------------------------------+------------------------------------+
>>> | Vennlig hilsen, | Best regards,
>>> |
>>> | Trond Endrestøl, | Trond Endrestøl,
>>> |
>>> | IT-ansvarlig, | System administrator,
>>> |
>>> | Fagskolen Innlandet, | Gjøvik Technical College,
>>> 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>. |
>>> +-------------------------------+------------------------------------+
>>>
>>>
>>>
>>> --
>>> С уважением, Константин Кукушкин,
>>> Rambler Internet Holding
>>> mailto:dark at rambler-co.ru <mailto:dark at rambler-co.ru>
>>> тел.: 8 (495) 785-17-00#2129
>>>
>>>
>>>
>>>
>>> --
>>> Thanks for your support,
>>> Motty
>>>
>>
>>
>>
>
--
Thanks for your support,
Motty
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