[OpenSIPS-Users] 3.0.1 Full sharing registrar - mysql write back not working

Wed Nov 6 11:52:12 EST 2019

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.

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!

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 :)

On Wed, 6 Nov 2019 at 16:01, Liviu Chircu <liviu at opensips.org> wrote:

> Hi Callum,
>
> In short:
>
> * "sync-from-cluster" will deny all DB writes.  It is useful in case you
> don't
>   mind the risk of losing all registrations in case the active node is
> offline
>   and you restart the backup for some reason.  On the positive side, you
> will
>   push a lot less queries to the disk.
>
> * "load-from-sql" will enable all DB writes.  By using it, you gain better
>   durability for the registrations, just like in the vanilla OpenSIPS
> usrloc.
>   This is just a restart persistency related setting -- the cluster nodes
> will
>   still continue to replicate data at runtime and you will still be able to
>   invoke the "ul_cluster_sync" MI command.
>
> * "skip_replicated_db_ops" is some hack from version 2.2, and we haven't
> taken
>   the time to remove it from the code.  It seems to be still functional,
> so as
>   long as you enable it, the DB writes will be denied.
>
> Regards,
>
> Liviu Chircu
> OpenSIPS Developerhttp://www.opensips-solutions.com
>
> On 06.11.2019 17:10, Callum Guy wrote:
>
> Hi All,
>
> I've been testing a new cluster based registrar config and noticed that
> the location records weren't being written back to the database.
>
> 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.
>
> modparam("usrloc", "location_cluster", 25)
> modparam("usrloc", "cluster_mode", "full-sharing")
> modparam("usrloc", "pinging_mode", "ownership")
> modparam("usrloc", "restart_persistency", "*sync-from-cluster*")
> modparam("usrloc", "sql_write_mode", "write-back")
> modparam("usrloc", "timer_interval", 60)
> modparam("usrloc", "skip_replicated_db_ops", 1)
> modparam("usrloc", "max_contact_delete", 25)
> modparam("usrloc", "hash_size", 16)
> modparam("usrloc", "nat_bflag", "NATTED_CONTACT")
> modparam("usrloc", "use_domain", 1)
> modparam("usrloc", "db_url", "mysql://user:abc@192.168.151.20/opensips")
>
> 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.
>
> 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!
>
> Many thanks,
>
> Callum
>
>
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