Re: Synchronizing two mirror mode clusters

[Howard Chu <hyc@symas.com>]

Clément OUDOT wrote:
> Hi,
>
> I need to set up a backup OpenLDAP cluster and I am looking for advices on the
> best solutions to achieve it.
>
> The situation is:
> * A mirror mode cluster on one geographical site
> * A mirror mode cluster on another geographical site (backup site)
> * I would prefer not to impact configuration of main cluster
> * I think that full multi-master on different geographical site is not the
> best solution (but maybe I am totally wrong on this point)
>
> The backup site must be in sync with the main site.
>
> Here are my two ideas:
> * Configure a syncrepl client to main cluster on each node of the backup
> cluster. Question is: will not be conflicts as each node of the backup cluster
> is already synced with the other backup node?

If you are actually using mirrormode, where only one server receives writes at 
a time, there can be no conflict.

> * Configure a LDAP proxy (back-ldap) to backup cluster, with syncrepl client
> to main cluster. But would back-ldap be able to write operational attributes
> to backup cluster?

Configure back-ldap with appropriate credentials, and configure updatedn on 
the target server, then yes, it can write operational attributes.

> I imagine that some of you already have such needs, could you share your
> experience?
>
>
> Thanks,
>
> Clément.


--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/