'Production' improvements to pdb_ldap
abartlet at samba.org
Sat Oct 12 04:03:01 GMT 2002
Samba 3.0 is starting to be used in a lot of places, and I'm starting to
look into how we can best ensure we don't get bottlenecks in our
Metze has raised a number of issues with pdb_ldap:
- We do a Get_Pwnam() on every user - even in enums.
- We hit the LDAP server for a new connection each time
Both of these we have known about for a while - but it turns out that
usrmgr asks for a list of all users (enum), then asks for each user by
RID. In his (quite large) setup, this can take so long that usrmgr
For the first problem, I am proposing that we use the uidNumber
gidNumber etc in the user's ldap record directly - rather than going a
Get_Pwnam() for that information. Naturally, if that information is not
present, we can do a Get_Pwnam anyway.
However, the question is: Should we make this the default? It's fine
for sites running nss_ldap, but it does change behavior. Or should we
add 'yet another smb.conf option', that admins would have to turn on if
they are running such large domains?
I would propose 'ldap trust uids' as the name, unless somebody comes up
with a better one :-).
For the second issue, we will just have to start caching connections -
it doesn't look too hard, just a wrapper around the actual calls, but
I've not had a chance to implement it.
Andrew Bartlett abartlet at pcug.org.au
Manager, Authentication Subsystems, Samba Team abartlet at samba.org
Student Network Administrator, Hawker College abartlet at hawkerc.net
http://samba.org http://build.samba.org http://hawkerc.net
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