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documentate nscd bugs 

Signed-off-by: Nico Schottelius <nico@ikn.schottelius.org>
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Nico Schottelius 2010-04-23 10:24:20 +02:00
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[[!meta title="Known bugs of nscd with LDAP"]]
As [[stated some time ago|debian-with-ldap-forgets-users]],
I had the problem that users vanished after some time.
As I get a lot of e-mails regarding this problem, I therefore
documentate here the details I've found out so far:
## Ncsd works unreliable
Yes, indeed, switching off nscd removes the problem.
But there are more problems I experienced with nscd:
* Sometimes it consumes 100% cpu (and does not stop that until being killed)
* Sometimes it just crashes.
* Sometimes it causes users to "vanish" (the original problem)
* Sometimes it hangs and thus slows down the whole system
## The alternatives
In D-INFK department in the ETH we're heavily dependent on the
LDAP database, as most services are using it as its primary
database. To overcome the problem, there are several solutions:
* Dump the ldap database into standard /etc/passwd and /etc/shadow
* Shutdown nscd and let the LDAP-Server handle the load
* Install [unscd](http://busybox.net/~vda/unscd/)
I'm going for the last one now.
[[!tag eth unix]]