[SR-Users] Active/active keepalived - Kamailio includes non-local virtual IP in "myself" which breaks DMQ call routing
Arnd Schmitter
aschmitter at megasat.de
Wed Dec 15 08:04:50 CET 2021
Hi,
For the RPC command, take a look at https://kamailio.org/docs/modules/5.5.x/modules/pv.html#pv.rpc.shvSet
Regards
Arnd
Am Mi, Dez 15, 2021 um 04:59:06 schrieb Rhys Hanrahan:
> Hi Guys,
>
> That's awesome - thanks to you both for the suggestions. I had overlooked anycast because my Ips are only active on one box at a time, but it makes sense that I'm basically dealing with the same challenges as an anycast setup, thanks Igor.
>
> And thanks Arnd! This is what I was thinking of as a quick fix, but I couldn't find anything useful to change via RPC commands. A shared variable makes perfect sense!
>
> I will work through these ideas and post back with whatever I manage to come up with.
>
> Thanks!
> Rhys.
>
> On 15/12/21, 12:19 am, "sr-users on behalf of Arnd Schmitter" <sr-users-bounces at lists.kamailio.org on behalf of aschmitter at megasat.de> wrote:
>
> Hello Rhys,
>
>
> For a quick solution, to can use notify scripts in keepalived which will alter a shared variable via RPC call. Then you can test the content of this variable to see if this instance is master or not.
>
>
> Regards,
> Arnd
>
>
> Am Di, Dez 14, 2021 um 14:03:27 schrieb 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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