Are you perhaps getting Kamailo's db_cluster module confused with Galara's clustering?  Kamailio's db_cluster module works as an abstraction for SQL connections - there's no explicit technical need for the actual DBs in the connection to be synchronized (you almost certainly would WANT them to be synchronized, but the module itself doesn't care).  I have several situations where I connect to multiple SQL replicas (in some cases mysql, in other cases postgres) with the intent that there is a primary and secondary DB.  This is just basic SQL replication. The Kamailio config looks like this:

## Define all of the individual connections for the cluster:
modparamx(
    "db_cluster",
    "connection",
    "primary=>mysql://$def(DB_USER):$def(DB_PASS)@$def(DB_HOST)/$def(DB_DATABASE)"
)
modparamx(
    "db_cluster",
    "connection",
    "secondary=>mysql://$def(DB_USER):$def(DB_PASS)@$def(DB_BAK_HOST)/$def(DB_DATABASE)"
)

## Define the cluster. List each connection and its priorities. In this
## case the reads preferring primary (9s), but will fall back to the secondary
## and the writes are ONLY to the primary:
modparam("db_cluster", "cluster", "db=>primary=9s9s;secondary=8s0s")

## Use the DB cluster anywhere a "db_url" mod param is used:
modparam("permissions", "db_url", "cluster://db");

I'm not using the sca module, but it has a db_url parameter, and I would expect it could be used exactly like this.  If this is what you're doing and it's not working, what error are you getting?

Kaufman

Senior Voice Engineer



E: bkaufman@bcmone.com




 

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From: mauro.celli76--- via sr-users <sr-users@lists.kamailio.org>
Sent: Thursday, May 29, 2025 7:11 AM
To: sr-users@lists.kamailio.org <sr-users@lists.kamailio.org>
Cc: mauro.celli76@gmail.com <mauro.celli76@gmail.com>
Subject: [SR-Users] Sca in cluster/load balancer
 
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We have two kamailio in load balancing, mysql is in cluster mode with galera.
We need to use sca, but kamailio db_cluster is not supported (i need to specify connection string to sql not cluster name) and if phone1 is registered on kamailio1 and phone2 on kamailio2, sca not work. It is possibile to implement cluster?
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