[Serusers] use of SRV records for failover

[Marcello Lupo]

Hi,
i was searching a way to do the same thing but using the Linux virtual 
server i didn't found a way to let the virtual server to continue to send to 
the same SER all the UDP packet related to a specific call. It should have a 
module to check the CallID header and mantain a table on which SER is 
managing it for all packet (INVITE,TRYING,RINGING,OK,BYE and so on).
The other solution may be to use TCP SIP but i don't like it and not so much 
clients have support for it.
Let me know if you found a good way to do it.
Bye
Marcello

----- Original Message ----- 
From: "sip" <sip at arcdiv.com>
To: "Markus Storm" <markus.storm at telefonica.de>; <serusers at lists.iptel.org>
Cc: <serusers-bounces at lists.iptel.org>
Sent: Tuesday, September 27, 2005 12:34 PM
Subject: Re: [Serusers] use of SRV records for failover


> Markus,
>
> I'm not sure I fully understand.  Are you trying to essentially load
> balance by using SRV records in DNS?
>
> Those two aren't really the same thing. You'd need some sort of gateway
> software/hardware that keeps track of current state of the sub server
> processes in order to determine at any given point which is up and which
> is down... PLUS it sounds like you want to make it so that each is
> assigned a weight.
>
> SER doesn't really have the ability to do that on its own. You could
> probably MAKE it do that with some very creative scripting and/or
> database queries... but it wouldn't be pretty.
>
> It would be easier to use an actual load balancer/load balancing
> software to accept initial connections and forward those accordingly.
>
> For instance, if you want SER1 to forward calls to EITHER SER2 or SER3,
> then you would have SER1 point to a load-balanced virtual server. Some
> other software would handle the load balancing and SER would be unaware
> that it wasn't pointing to a normal server. This could be done pretty
> easily using linux virtual server or some such and it wouldn't require
> any special setup in SER.
>
> N.
>
> On Tue, 27 Sep 2005 10:31:43 +0200, Markus Storm wrote
>> Dear all,
>>
>> we would like to do loadbalancing and failover with SRV in our multi-
>> SER setup.
>>
>> I.e. ser-1 gets a call and can forward the call to either ser-2 or
>> ser-3. There's a DNS SRV record that points to both, ser-2 and ser-3
>> (same weight, same priority). On ser-1, I use the SRV name to
>> forward calls to.
>>
>> Now I'd like ser-1 to distribute calls according to weight and
>> priority, i.e. 50% to ser-2 and 50% to ser-3. But it doesn't, it
>> keeps sending to ser-2 (the first entry in the SRV record's list).
>>
>> Also, if say ser-2 goes down, I'd like ser-1 to notice that and only
>> ever try to send subsequent requests to ser-2 until <something>
>> happens (e.g. until the SRV record TTL expires).
>>
>> I found a one-year old message in the archives stating that neither
>> of this is possible
>> (unless I use a DNS A record that points to multiple IP addresses,
>> but that's not what I want).
>>
>> Is it meanwhile possible with the current SER software ?
>>
>> thanks
>> Markus
>>
>> _______________________________________________
>> Serusers mailing list
>> serusers at lists.iptel.org
>> http://lists.iptel.org/mailman/listinfo/serusers
>
> _______________________________________________
> Serusers mailing list
> serusers at lists.iptel.org
> http://lists.iptel.org/mailman/listinfo/serusers
>