[Fedora-directory-users] NSUniqueID
Richard Megginson
rmeggins at redhat.com
Tue May 15 18:47:04 UTC 2007
Bjorn Oglefjorn wrote:
> On 5/15/07, *Richard Megginson* <rmeggins at redhat.com
> <mailto:rmeggins at redhat.com>> wrote:
>
> Bjorn Oglefjorn wrote:
> > On 5/15/07, *Richard Megginson* <rmeggins at redhat.com
> <mailto:rmeggins at redhat.com>
> > <mailto:rmeggins at redhat.com <mailto:rmeggins at redhat.com>>> wrote:
> >
> > Bjorn Oglefjorn wrote:
> > > That's the problem Richard, I'm not sure how it
> happens. I can tell
> > > you this much though. I am using NSUniqueID as a globally
> unique id
> > > for a one-way sync agreement to a specific application
> (from FDS to
> > > the application). The requirement for the globally unique
> id is
> > that
> > > it never changes. If it somehow does change, the sync
> process
> > > provides an error stating that the globally unique ids in FDS
> > and the
> > > application no longer match. I can't determine exactly
> what is
> > > causing this change, but I do know that it is happening.
> > But how does the sync process/application determine that the
> unique ID
> > has changed? And is it possible that some application is
> writing
> > to the
> > nsUniqueID attribute and changing its value externally? Are
> you using
> > replication?
> >
> >
> > There is no application that has write access to our LDAP user tree.
> > I am using a dual multi-master replication setup. What about
> > replication would cause the NSUniqueID to change?
> If you delete an entry then add it back with the same DN and mail
> value,
> it will generate a new nsUniqueID for the new entry. Also, certain
> replication operations may generate replication conflict entries. In
> this case, you could see two entries with the same mail attribute but
> different nsUniqueID values and different DNs.
>
>
> The entry was not deleted, only the mail attribute was modified. The
> RDN contains the uid of the entry.
Could you perhaps post the entry before and after the modification? I
would really like to see the entry with all of the replication state
information. You can get this by listing the special attribute
nscpEntryWsi e.g.
ldapsearch .... (nsuniqueid=value) nscpEntryWsi
Be sure to obscure any sensitive information before posting. If there
is a lot of output, you can use pastebin.com or rafb.net to avoid
spamming the list.
>
> To check for this, do a search for each of the "duplicate" nsUniqueID
> values using a search filter like this:
> (|(nsuniqueid=value1)(objectclass=nsTombstone))
> and
> (|(nsuniqueid=value2)(objectclass=nsTombstone))
>
>
> The first filter returns nothing (implying that there are no entries
> in the directory with objectclass=nsTombstone).
Replication update procedures may create tombstones. Those entries do
not show up unless you specify that filter in your search request. So
if the entry is a tombstone, and you did a search for (nsuniqueid=value)
the entry would not be returned unless you added
|(objectclass=nsTombstone) to the search filter.
> The second filter returns the entry in question. That seems to be
> what one would normally expect if there hadn't been a change in the
> nsuniqueid, correct?
Yes.
>
> >
> > For example, does your sync app do something like this:
> > get entry by name e.g . (uid=somename). Store the
> nsUniqueID for
> > the entry.
> > Then later, do the same search (uid=somename) and get the
> nsUniqueID.
> > Compare the nsUniqueID to the one stored previously.
> >
> >
> > That is nearly exactly how the sync application works. For any
> entry
> > that the application keeps track of, it keeps a 'lastseen' LDIF. on
> > the next run of the sync, a search is performed and the LDIFs are
> > compared.
> >
> > If this is the case, is it possible that the uid for the
> entry has
> > changed?
> >
> >
> > No, the only change made to the entry in question was to the 'mail'
> > attribute.
> >
> > > --BO
> > >
> > > On 5/15/07, *Richard Megginson* <rmeggins at redhat.com
> <mailto:rmeggins at redhat.com>
> > <mailto: rmeggins at redhat.com <mailto:rmeggins at redhat.com>>
> > > <mailto:rmeggins at redhat.com <mailto:rmeggins at redhat.com>
> <mailto:rmeggins at redhat.com <mailto:rmeggins at redhat.com>>>> wrote:
> > >
> > > Bjorn Oglefjorn wrote:
> > > > Hello all,
> > > >
> > > > Can someone tell me, does the NSUniqueID attribute ever
> > change for a
> > > > given entry in the directory?
> > > No.
> > > > If so (I've seen it happen),
> > > Can you describe exactly what you saw and how to
> reproduce it?
> > > > what are the criteria that prompt NSUniqeID to change?
> > > >
> > > > Thanks,
> > > > BO
> > > >
> > >
> >
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