[OpenSIPS-Users] keepalived for HA OpenSIPS

[Gavin Henry]

On 15 March 2010 10:38, Bogdan-Andrei Iancu <bogdan at voice-system.ro> wrote:
> Hi Gavin,
>
> Gavin Henry wrote:
>> On 15 March 2010 09:52, Bogdan-Andrei Iancu <bogdan at voice-system.ro> wrote:
>>
>>> Hi Gavin,
>>>
>>> As I understand you try to solve the SPOF issue with the your opensips
>>> front load balancer, right ? Instead of adding another component to do
>>> the monitor the LB, why not using a HA system (vrrp, heartbeat, etc) to
>>> have an active-backup configuration for the LB ?
>>>
>>
>> Hi Bogdan,
>>
>> That's what I said:
>>
>> "We'd like to put a keepalived in front of both OpenSIPS servers".
>> keepalived is VRRP.
>>
> Oh, ok - I thought you meant another fronting app doing the KA to the
> opensips servers (LBs)
>> My question is you'll still have just one keepalived server monitoring
>> the systems.
>>
>> I'm trying to understand what others do here. We have for this customer:
>>
>> DC1:
>>
>> OpenSIPS <-> Asterisk...Asterisk...Asterisk
>>
>>
>> DC2:
>> OpenSIPS <-> Asterisk...Asterisk...Asterisk
>>
>>
>> What do others put in front to switch between the two datacenters but
>> still avoiding having one keepalived/heartbeat server inbetween these
>> two DCs?
>>
> The vrrp or heartbeat does not requirement any extra servers - these
> application are run on the same servers are the front-end app (OpenSIPS
> LB in your case).

Ah, my lack of understanding there.

> Here, the concept is of having a floating IP (controlled by vrrp or HB)
> that may be dynamically moved and attached to a server (the opensips
> servers in your case).

Understood.

> These mechanisms require to have the servers (sharing the IP) to be in
> the same network (as ARP pings are used) - and also you cannot simply
> move an IP from a network to other.

Right, thanks.

>> Do you address this by having a few heartbeat/keepalived servers that
>> get returned for the DNS records, for example:
>>
>> sip.mycustomer.com returns a keepalived IP that is running in each
>> datacentre whereby each VRRP server points to both DCs. Then if anyone
>> one goes down its points to the other?
>>
> your DNS will point to a virtual IP, where this IP may be mapped either
> to the opensips in DC1 or in DC2 . VRRP will be running on the opensips
> servers in both DC.

Thanks.

> Bogdan-Andrei Iancu
> www.voice-system.ro
>
>
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