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Tracking down persistent OpenLDAP corruption
So... I'm having a problem with persistent corruption in Apple's Open
Directory. I believe this corruption is related to OpenLDAP and the
BerkeleyDB. I was hoping that folks here might be able to help me
track down whether this is the problem or not.
Essentially, what is happening is that user accounts will "disappear"
from workgroup manager and dscl. Accounts that have maintained a
persistent connection will continue to be authenticated. But, accounts
that are not authenticated will be unable to authenticate. The
Directory Administrator account, for example, cannot authenticate at
these times. If I restart slapd, all the missing accounts that had
persistent connections will no longer be able to authenticate.
An LDIF export, however, will show that the accounts are all still
A regular repair and a catastrophic repair of of the BerkleyDB does
not work. The first time this happened, it DID work, but
subsequent events have not been so easily fixed.
A restore from backup is the only way to fix it. However, I suspect
that there is malformed data lurking somewhere in the OpenLDAP
system. The backups all have this malformed data. Thus, it doesn't
take very much for the system to get corrupted again. A hard shutdown
does it every time, and a minor upgrade to the OS did it, too.
The standard suggested fix is destroy and rebuild the Open Directory
setup. For obvious reasons, I would like to avoid this. I want to
know *what* is happening.
If it is, in fact, malformed data that is becoming corrupt, *what*
data should I be examining, *where* is it located, and *how* do I
check it for anomalies?
Has anyone else had this kind of persistent corruption of their LDAP
system? What was causing it? How did you find it?
Any leads or words of wisdom would be greatly appreciated.