29 Dec
2014
29 Dec
'14
12:13 p.m.
On 27 December 2014 at 23:44, Carsten Bock <carsten(a)ng-voice.com> wrote:
Hi Mahmoud,
Thy typical way, to build a Active/Active setup is by using DNS-SRV
records. The two servers get different IPs and you announce both IPs
using DNS to the devices. Most common User-Agents support this
nowadays, so that's kind of easy. It is specified in RFC3263:
"Locating SIP-Servers" (http://tools.ietf.org/html/rfc3263).
However, when using DNS-SRV records, dialogs and transactions are
still associated with a single server, even though the User-Agent has
an Alternative, in case one server fails. If you want to increase the
HA for this, you can advertise the Domain name instead of an IP
(causes more DNS-Lookups).
Just a word of caution here, there are several SIP stacks which don't
handle SRV lookups correctly. I don't mean to discourage you from this, but
just to be aware of it. For example, Mobicents only understands SRV record
sets which return domain names. If you return IPs, Mobicents will go ahead
and look them up as A records and fail.
You can share the dialog state etween two nodes by
using the dialog
module in db-only mode (db_mode = 1, see
http://kamailio.org/docs/modules/devel/modules/dialog.html#idp15368320).
You cannot share transactions between two nodes, only dialogs.
In addition, you can work with virtual IPs with Heartbeat/Pacemaker.
At a big operator, we've used a combination of the two: Active/Passive
for one site and DNS-SRV to distribute it among different sites.
Kind regards,
Carsten
2014-12-26 19:07 GMT+01:00 Mahmoud Ramadan Ali <
cisco.and.more.blog(a)gmail.com>gt;:
Hi Dears,
I have successfully configured Kamailio HA using Heartbeat and Pacemaker
so
if one of the two servers should go down the
other server will own the
virtual IP address and take over.
But i have two questions:
1.This model is considered to be Active / Passive redundancy so one
server
will process the SIP signaling until it goes down
and i'm wondering is
there
is any way two achieve Active / Active redundancy
and if so how the
signaling will be handled on the servers so they can be aware of the
transactions and dialogs traversing the servers ? does the signalling
will
be replicated or synchronized between the servers
or what ?!
2.What about the servers DB and how they should be designed in a cluster
mode ? i want to replicate all the DBs of the server to get consistent
user
registration using the subscriber table for
example.
Thanks in advance and Best regards.
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