Hello, Is anyone able to confirm whether the cluster definition I provided should indeed do what I think it should? If so, I will take a look further myself to find the reason why not. Thanks in advance, Charles On 20 Aug 2013 16:18, "Charles Chance" &lt;charles.chance(a)sipcentric.com <mailto:charles.chance@sipcentric.com>> wrote: Hi All, I'm having difficulties with the above module and can't see what I'm doing wrong. Config as follows: modparam("db_cluster", "connection", "db01=>mysql://readwrite:password@db01.domain.com/kamailio <http://readwrite:password@db01.domain.com/kamailio>") modparam("db_cluster", "connection", "db02=>mysql://readonly:password@db02.domain.com/kamailio <http://readonly:password@db02.domain.com/kamailio>") modparam("db_cluster", "cluster", "cls1=>db01=0s9s;db02=9s0s") As you can see, there are two database servers - a master and a slave. I am trying to force all read operations to the slave (db02) and all write operations to the master (db01). Unless I am missing the point, the above priorities should achieve the desired effect. However, it seems to be going wrong somewhere as write operations are being sent to the slave: ERROR: db_mysql [km_dbase.c:122]: driver error on query: DELETE command denied to user &#39;readonly&#39;(a)&#39;x.x.x.x&#39; for table 'location' ERROR: db_mysql [km_dbase.c:122]: driver error on query: UPDATE command denied to user &#39;readonly&#39;(a)&#39;x.x.x.x&#39; for table 'location' ERROR: db_mysql [km_dbase.c:122]: driver error on query: INSERT command denied to user &#39;readonly&#39;(a)&#39;x.x.x.x&#39; for table 'location' It is the same for all modules, by the way, not just usrloc. For each module, I have db_url set to "cluster://cls1". If I change the cluster definition to "cls1=>db01=9s9s;db02=0s0s", all operations (read and write) are sent to db01 as expected. Am I missing something here? Can anyone see what I may be doing wrong? Many thanks, Charles www.sipcentric.com <http://www.sipcentric.com/> Follow us on twitter @sipcentric <http://twitter.com/sipcentric> Sipcentric Ltd. Company registered in England & Wales no. 7365592. Registered office: Unit 10 iBIC, Birmingham Science Park, Holt Court South, Birmingham B7 4EJ. _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users