Re: Recovering from a Single-Node downtime in a Multi-Master Setup

[espeake@oreillyauto.com]

Do the slapcat on ldap2 and then delete the db files on ldap1 and then run
the slapadd.  you will not get duplicates because all of the CSN's will be
the same.  This is what I have done my migrations to the most recent
versions and doing my own builds.  Works great that way.


Eric Speake
Web Systems Administrator
O'Reilly Auto Parts



From:	Marco Nett <nett@billiger-mietwagen.de>
To:	Quanah Gibson-Mount <quanah@zimbra.com>
Cc:	"openldap-technical@openldap.org"
            <openldap-technical@openldap.org>
Date:	12/10/2013 11:00 AM
Subject:	Re: Recovering from a Single-Node downtime in a Multi-Master
            Setup
Sent by:	openldap-technical-bounces@OpenLDAP.org



I'm running openldap 2.4.28.
If i just slapcat ldap2 and slapadd that to ldap1, won't i end up with
duplicates on ldap1?

is this the best way to do this?


2013/12/8 Quanah Gibson-Mount <quanah@zimbra.com>


  On Dec 7, 2013, at 2:48 AM, Marco Nett <nett@billiger-mietwagen.de>
  wrote:

        Quick question:

        State 1:
        - I have two OpenLDAP slapd servers (ldap1 and ldap2) configured as
        Multi-master.
        - The both have the exact same data between the mirrored
        directories.
        - If I create a new directory entry on one server, it immediately
        gets mirrored to the second server.
        - I'm happy.

        State 2:
        - One LDAP-Master (ldap1) is down because of whatever.
        - Changes to the directory are made on the LDAP-Master which is
        still up (ldap2).
        - Changes are not mirrored to ldap1 because it's down.
        - I'm a little worried but still happy.

        State 3:
        - ldap1 is back up and running, but it's directory is not up to
        date.
        - The changes made to ldap2 in state 2 are not on ldap1 and aren't
        getting replicated automatically.
        - Mirroring again works fine, but ldap1 still doens't know about
        changes made in state 2.
        - I'm confused because I can't seem to find any information on how
        to recover from this.

        I couldn't just delete the directory on ldap1 and import the one
        from ldap2 because the importing would also be mirrored to ldap2.
        right?
        how would i go about recoverying from a downtime in a multi-master
        setup?

  What is the exact version of openldap are you running?

  To recover, you could slapcat ldap2 and slapadd that to ldap1 so the db's
  and csn's are sync'd up.

  --Quanah

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