[SR-Users] High availability
Daniel-Constantin Mierla
miconda at gmail.com
Tue Jun 7 09:01:23 CEST 2016
Just to mention that ucarp can be a very basic alternative to
corosync/pacemaker to manage the virtual ip. A simple app, but usually
keeps working...
Cheers,
Daniel
On 06/06/16 02:21, Fred Posner wrote:
> If it's just 2 servers, consider as Juha said, corosync/pacemaker with
> drbd.
>
> Fred Posner
> direct: +1 (224) 334-FRED (3733)
>
> On Jun 5, 2016, at 5:26 PM, Moacir Ferreira
> <moacirferreira at hotmail.com <mailto:moacirferreira at hotmail.com>> wrote:
>
>> Hi,
>>
>> Sorry... I should have mentioned before. You guys are thinking on the
>> standard Internet SIP calls' behavior while I am trying to use
>> Kamailio on a large "industrial" project. This said:
>>
>> Assuming that the end-point is "smart", the DNS method is functional
>> but it would take quite a while before the UA (phone) recovers from
>> the previous name/IP binding it has in cache;
>> SRV is good for a "smart" UA that, unfortunately, is not the case;
>> Same for the phone units as they are industrial "Help Points" and so
>> quite "dummy".
>>
>> While I never tested it, I thought I could use two Kamailio servers
>> with a mysql cluster like mariadb-galera where, for Kamailio
>> functions, one server would be "active" and another "passive" server.
>> Then use keepalived for monitoring the "active" Kamailio and starting
>> the "passive" server if the active Kamailio fails. Without any
>> testing, tests that I think I should have done before putting
>> questions in here, my questions are:
>>
>> Suppose that I have two Kamailio servers, one "active" and another
>> one "passive" (not running) where the mysql databases are
>> synchronized in between two servers using MySQL Galera. Using
>> keepalived I would monitor the active Kamailio instance. Should it
>> fails, start the "passive" Kamailio instance using the same MySQL
>> database that were supposed to be synchronized. Would this new
>> Kamailio instance be able to find a called number? Why this question?
>> As long as I understand, Kamailio will always challenge the UA for
>> authentication before making a call, so if this second server gets a
>> call request it would just challenge and authenticate the caller. The
>> "key point" would be having this new Kamailio instance aware about
>> the called destinations. So, delivering a MySQL database, with the
>> latest data the active Kamailio had, to this new Kamailio instance
>> would be enough to allow it find the called party?
>>
>> Anyway, can you guys comment on my "thoughts"? Is it possible? Am I
>> missing something? Would you suggest another approach for such scenario?
>>
>> Cheers!
>> Moacir
>>
>> ------------------------------------------------------------------------
>> Date: Sun, 5 Jun 2016 21:07:41 +0200
>> From: chabert.loic.74 at gmail.com <mailto:chabert.loic.74 at gmail.com>
>> To: sr-users at lists.sip-router.org <mailto:sr-users at lists.sip-router.org>
>> Subject: Re: [SR-Users] High availability
>>
>> Hello Bill,
>>
>> I have made kamailio ha using exabgp with loopbacks.
>>
>> Check https://github.com/Exa-Networks/exabgp
>>
>> With bgp, kamailio cluster can be splited on severals datacenters.
>>
>> Regards.
>>
>> Le 5 juin 2016 20:53, "Bill" <bill at novatrope.us
>> <mailto:bill at novatrope.us>> a écrit :
>>
>> Hi Moacir
>>
>> We have only found three ways to handle failover.
>> 1. Change the DNS entry whenever a failure is detected.
>> 2. Use SRV records to display an alternate route.
>> 3. Use the failover mechanism in the phone itself
>>
>> 1. works, but it may take some time for your ua's to become aware
>> of the change
>> 2. never have been able to get this to work as advertised.
>> 3. Works pretty well depending on the phone. (We use mostly
>> Yealink's and they seem to handle the failover pretty well.)
>>
>> Hope this helps
>>
>> On 06/05/2016 07:41 AM, Moacir Ferreira wrote:
>>
>> Hi,
>>
>> I got two questions regarding high availability:
>>
>> 1 - Should my Kamailio server fail, I would like another
>> Kamailio "box/server" to take over with minimum services
>> disruption. What is the "community" advice for such environment?
>>
>> 2 - Should my main PSTN gateway fail, what would be the best
>> mechanism to redirect calls to a second PSTN gateway?
>>
>> Cheers!
>> Moacir
>>
>>
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--
Daniel-Constantin Mierla
http://www.asipto.com - http://www.kamailio.org
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
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