[OpenSIPS-Users] keepalived for HA OpenSIPS

[Bogdan-Andrei Iancu]

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).

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).

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.
> 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.

Regards,
Bogdan
> Thanks,
>
> Gavin.
>
>   


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