Re: How to set BDB "read-only" before slapcat command ?
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2009/2/9 Michael Ströder <michael(a)stroeder.com>:
No matter what you do at the LDAP server's side it could happen
in
between a series of related write operations leading to inconsistent
state of data (from the application's point of view).
If you want better hints then you have to provide more details about
your deployment.
Ciao, Michael.
We have a primary "hidden" master and two replicating secondaries
which both get queried in a round-robin DNS fashion.
Applications such as phpLDAPadmin are configured to connect to these
secondaries which pass writes to the primary via an updateref chain
overlay.
At the moment I am using slapcat on the primary for backups but am
open to other suggestions.
Perhaps I should just create a third read-only replicating secondary
which no applications connect to and backup from that ?
The possible problem I see with that setup is what happens if the
slapcat occurs during an update from the provider to the consumer ?
Monday, 9 February
Mon, 9 Feb
8:08 a.m.
New subject: How to set BDB "read-only" before slapcat command ?
--On Monday, February 09, 2009 3:44 PM +0000 Andrew Hall
<whippyhubbles(a)googlemail.com> wrote:
The possible problem I see with that setup is what happens if the
slapcat occurs during an update from the provider to the consumer ?
I'm not sure why you feel it is necessary to set the server read-only
before you run slapcat anyway. Do you actually have a process that knows
exactly what changes occurred in any given second, so that, if say, your
backup starts at 1:00:00, you can then replay all the changes from that
point in time?
If you do, then it doesn't matter whether or not it was in read-only.
Simply replay the changes. If you don't, then it doesn't matter whether or
not it was in read-only, because you don't know what changes happened after
that point.
I honestly am not aware of anyone who bothers to put their DB into
read-only before slapcatting, although they may be out there.
--Quanah
--
Quanah Gibson-Mount
Principal Software Engineer
Zimbra, Inc
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Quanah Gibson-Mount