<div dir="ltr">Thanks Liviu, that helps a lot. My expectation was that the sync-from-cluster option would favour a sync operation from a local active peer via the binary interface on first boot, that sounded like the ideal behaviour as it should be fully up to date; especially in db write back mode. For our production operations it isn't common for the server to be taken down unexpectedly so in reality it won't make too much difference to use the database as the primary data source on boot. <div><div><br></div><div>I can confirm that the load-from-sql behaviour is replicating the contacts via clusterer and provides us with the resilience we need, in addition the ownership pinging_mode is working exactly as it should - thanks for these neat features! </div><div><br></div><div>Should I remove skip_replicated_db_ops from our configuration, we're about to go live and if it is not a useful setting we would want to take this opportunity to purge it! To clarify, my interpretation of the docs for this option is that it would prevent duplication of the DB writes for new/updated registrations which we would not want. In our two node clusters we'd ideally just have the second as a hot backup which captures all the dialog and user data but doesn't do anything with it until it gains the sharing tag - including DB ops. If we can remove the skip_replicated_db_ops option and keep this behaviour please let me know, otherwise we'll leave it in place :)</div></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 6 Nov 2019 at 16:01, Liviu Chircu <<a href="mailto:liviu@opensips.org">liviu@opensips.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p><tt>Hi Callum,</tt></p>
<p><tt>In short:<br>
</tt></p>
<p><tt>* "sync-from-cluster" will deny all DB writes. It is useful
in case you don't<br>
mind the risk of losing all registrations in case the active
node is offline<br>
and you restart the backup for some reason. On the positive
side, you will<br>
push a lot less queries to the disk.<br>
</tt></p>
<p><tt>* "load-from-sql" will enable all DB writes. By using it,
you gain better<br>
durability for the registrations, just like in the vanilla
OpenSIPS usrloc.<br>
This is just a restart persistency related setting -- the
cluster nodes will<br>
still continue to replicate data at runtime and you will still
be able to<br>
invoke the "ul_cluster_sync" MI command.<br>
</tt></p>
<p><tt>* "skip_replicated_db_ops" is some hack from version 2.2, and
we haven't taken<br>
the time to remove it from the code. It seems to be still
functional, so as<br>
long as you enable it, the DB writes will be denied.<br>
</tt></p>
<p><tt>Regards,<br>
</tt></p>
<pre cols="72">Liviu Chircu
OpenSIPS Developer
<a href="http://www.opensips-solutions.com" target="_blank">http://www.opensips-solutions.com</a></pre>
<div>On 06.11.2019 17:10, Callum Guy wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi All,<br>
<div><br>
</div>
<div>I've been testing a new cluster based registrar config and
noticed that the location records weren't being written back
to the database. </div>
<div><br>
</div>
<div>The issue appears resolved when I switch
usrloc.restart_persistency from "sync-from-cluster" to
"load-from-sql". This is acceptable however it seems more
correct to allow clusterer to sync the data for me.</div>
<div><br>
</div>
<div>modparam("usrloc", "location_cluster", 25)<br>
modparam("usrloc", "cluster_mode", "full-sharing")<br>
modparam("usrloc", "pinging_mode", "ownership")<br>
modparam("usrloc", "restart_persistency", "<b>sync-from-cluster</b>")<br>
modparam("usrloc", "sql_write_mode", "write-back")<br>
modparam("usrloc", "timer_interval", 60)<br>
modparam("usrloc", "skip_replicated_db_ops", 1)<br>
modparam("usrloc", "max_contact_delete", 25)<br>
modparam("usrloc", "hash_size", 16)<br>
modparam("usrloc", "nat_bflag", "NATTED_CONTACT")<br>
modparam("usrloc", "use_domain", 1)</div>
<div>modparam("usrloc", "db_url", "mysql://<a href="http://user:abc@192.168.151.20/opensips" target="_blank">user:abc@192.168.151.20/opensips</a>")<br>
</div>
<div><br>
</div>
<div>I have attempted several variations including
removing skip_replicated_db_ops and changing sql_write_mode
however nothing resolved the issue. The contacts were visible
within the cluster (mi ul_dump) but I couldn't get them to
sync back to the database at all.</div>
<div><br>
</div>
<div>My target implementation is to have a pair of instances,
sharing a VIP (keepalived), such that when a node is
terminated the clusterer module has preshared all the data and
registrations and dialogs do not drop. I have configuration
for the dialog and clusterer module which I would be happy to
share if required. I would be very interested to hear if I am
doing something wrong or misunderstanding how it should work!</div>
<div><br>
</div>
<div>Many thanks,</div>
<div><br>
</div>
<div>Callum</div>
</div>
<br>
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