When I modify /etc/nsswitch.conf, is there an "nss" daemon I should restart? I am not referring to modules such as mdns & nis.

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No you probably don't (other than what David said, and maybe ypbind, but you said not NIS). The nsswitch.conf file isn't for a daemon in particular, it is actually a file used by the C library for various system calls.

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You may have nscd (Name Service Caching Daemon) running, which you may need to restart, otherwise it's unlikely. Certain daemons might cache get*() function call results and may need restarting.

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Well since my answer as accepted I have to give David the upvote :-P – Kyle Brandt Oct 21 '09 at 17:30
\o/ cheers. now I feel the need to upvote you for your generosity. – David Pashley Oct 21 '09 at 17:32
Thanks guys. I can see that nscd isn't installed/running by default on Ubuntu. – jldupont Oct 23 '09 at 15:24
That's probably a good thing. NSCD just normally causes more problems than it solves. :) – David Pashley Oct 23 '09 at 16:26
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