[Freeswitch-users] High Availability and hostname used by Sofia

[Anthony Minessale]

the registrations table intentionally does not consider the hostname
so you can cluster many boxes on the same domain.

On Mon, Oct 4, 2010 at 6:57 AM, Leon de Rooij <leon at scarlet-internet.nl> wrote:
> Hello List,
>
> This is going to be a long mail, please bear with me :-)
>
> I'd like to configure High Availability for a FreeSWITCH installation
> by using a failover server. I already discussed it a bit with Sekil on
> IRC, but I thought it'd be useful to discuss it here as well.
>
>
> The idea is as follows:
>
> - I have 2 servers both with an identical FreeSWITCH installation, FS1
> and FS2.
> - Both servers have different static IP's but also one floating IP by
> means of heartbeat / haresources.
> - Both FS instances have one Sofia SIP profile that use the floating IP.
> - Both FS instances are always started (so the backup server will fail
> to load its SIP profile because the IP is not configured - which is
> expected behaviour)
> - There'll be a /etc/ha.d/resource.d "resource script" that starts the
> SIP profile (through fs_cli -x) the moment it becomes primary
> - The resource script will also send a "sofia recover" after the SIP
> profile has been brought up
>
>
> This way:
>
> - There'll be one logical switch.
> - The moment FS2 becomes primary, users will be reachable through the
> entry in 'sip_registrations' table in the ODBC db, even though they
> may have registered on FS1
> - FS2 will start to send SIP options to NAT'ed useragents (keepalive /
> udp hole punching) the moment the SIP profile is started.
> - No client useragent involvement is necessary when failing over (like
> re-register)
> - Running calls will be continued because of the "sofia recover"
>
>
> Only problem here is that when a useragent registers to us, then FS
> also stores its own hostname in "sip_registrations" table in the
> columns "hostname" and "orig_hostname" (from
> mod_sofia_globals.hostname). This column is also used in the SELECT
> query when bridging to a user - so that means if the user registered
> to FS1, then a failover happens, then if a call is bridged towards
> that user on FS2, it won't find it because it will search with FS2's
> hostname in the SELECT query, right ?
>
> If everything I'm writing so far is correct, then would it be alright
> to override the hostname in sofia.conf ? I think that would solve my
> problem. I already looked it up - it is first set in mod_sofia.c at
> line 4565 through gethostname(). It can be overriden in sofia.c
> (function config_sofia) around line 2845. It would probably also work
> to give both hosts an identical hostname in the OS, but I don't like
> that (because of rsyslog and more).
>
>
> I'm not convinced yet on how to proceed, please let me know if I'm
> going the wrong direction. If I'm successful on getting this running,
> I'll document everything on the wiki - also the haresources script I
> already wrote I'll put in my contrib dir (or elsewhere in main tree if
> preferred).
>
>
> Thanks for your time,
>
> Leon
>
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-- 
Anthony Minessale II

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