

NSS
===


(v1.1+ only) 
Usually NSS [None] is used with >>passwd<< userdb, but it has one problem: It can't distinguish temporary and permanent errors. So if you're using e.g. nss_ldap and your LDAP database is down, all userdb lookups may return "user doesn't exist" errors. This is especially bad if you're using >>deliver<< which causes the mails to be bounced back to sender. 
This NSS userdb works around this problem by loading the NSS modules and calling them itself. This is a bit kludgy, and it probably works only with Linux. 
This userdb has two parameters: 

 * *service=<name>*: This parameter is required. The name specifies what NSS module to use, for example "ldap". 
 * *blocking=yes* causes the lookups to be done in worker processes. You'll probably want to use this with LDAP/SQL/etc. remote database lookups. 


Example
=======



---%<-------------------------------------------------------------------------
userdb nss {
  args = service=ldap blocking=yes
}
---%<-------------------------------------------------------------------------

(This file was created from the wiki on 2007-12-11 04:42)
