[SR-Users] Active/active keepalived - Kamailio includes non-local virtual IP in "myself" which breaks DMQ call routing

[Igor Olhovskiy]

Rhys,

Seems you're looking into something called "anycast". If it's the case, 
have you checked 
https://github.com/kamailio/kamailio/blob/master/misc/examples/mixed/kamailio-minimal-anycast.cfg 
?

But overall you are correct, myself is not enough clever to get if 
interface is active or not.

Regards,
Igor

On 14.12.2021 05:50, Rhys Hanrahan wrote:
>
> Hi Everyone,
>
> I have Kamailio acting as a registrar, using DMQ to replicate usrloc 
> between nodes. I’m relaying INVITEs to the home registrar, but 
> skipping this if (uri == myself) is true.
>
> In my lab I just setup my SBCs in an active/active mode, similar to 
> the link below. So I have 2x VIPs and both SBCs listen on both, but 
> the first VIP is only master on SBC01 and the second VIP is only 
> master on SBC02.
>
> https://docs.nginx.com/nginx/admin-guide/high-availability/ha-keepalived-nodes/ 
> <https://docs.nginx.com/nginx/admin-guide/high-availability/ha-keepalived-nodes/> 
>
>
> My issue is that now “myself” will always return true even if the 
> virtual IP is actually not active on this node at the moment, so the 
> invite is never relayed properly if it’s on another node. I guess 
> “myself” is just blindly looking at the list of Ips that are 
> configured with either listen= or alias= and doesn’t care if the IP 
> actually exists on the server at the time, or not?
>
> I am thinking I may have to ditch relying on “myself” entirely and 
> come up with some other way of checking for local requests, but I am 
> wondering if there’s a good way of approaching this? I was thinking of 
> perhaps triggering an add/remove of listen directives (or something) 
> when a failover of a VIP happens, though this seems kind of heavy 
> handed. Hoping there is a better way.
>
> Has anyone else tried doing active/active Kamailio instances like this?
>
> Thanks!
>
>
> *Rhys Hanrahan* | Chief Information Officer
> *e:* rhys at nexusone.com.au <mailto:rhys at nexusone.com.au>
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