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| -rw-r--r-- | doc/wiki/UserDatabase.NSS.txt | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/doc/wiki/UserDatabase.NSS.txt b/doc/wiki/UserDatabase.NSS.txt new file mode 100644 index 0000000..fac2a04 --- /dev/null +++ b/doc/wiki/UserDatabase.NSS.txt @@ -0,0 +1,34 @@ +NSS +=== + +NOTE: This userdb is probably useless with Dovecot v2.0.12+, since it uses +getpwnam_r(), which supports error reporting. + +Usually NSS [http://en.wikipedia.org/wiki/Name_Service_Switch] is used with +<passwd> [AuthDatabase.Passwd.txt] userdb, but it has one problem: It can't +distinguish between 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 <LDA.txt>, which +causes the mails to be bounced back to sender. + +The 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=no* causes the lookups to be done in auth master processes instead + of in worker processes. + +Example +------- + +---%<------------------------------------------------------------------------- +userdb { + driver = nss + args = service=ldap +} +---%<------------------------------------------------------------------------- + +(This file was created from the wiki on 2019-06-19 12:42) |