The nscd service comes as part of glibc , which means every Linux distribution will provide it. It is also extremely simple to set up. Once installed, edit the /etc/nscd.conf file to look similar to this:
server-user nscd
debug-level 0
reload-count unlimited
paranoia no
enable-cache passwd yes
positive-time-to-live passwd 3600
negative-time-to-live passwd 20
suggested-size passwd 211
check-files passwd yes
persistent passwd yes
shared passwd yes
enable-cache group yes
positive-time-to-live group 3600
negative-time-to-live group 60
suggested-size group 211
check-files group yes
persistent group yes
shared group yes
enable-cache hosts no
Now start the nscd service. The above configuration tells nscd to cache group and passwd entries and to let them persist for 3600 seconds.
Once nscd has started and has a few cached entries under its belt -- if you are already logged in and then disconnect from the network -- you will still be able to continue using the system just as if you were on the network -- apart from accessing shares and printers, utilising Kerberos, and performing new login sessions.
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source:http://linuxpoison.blogspot.com/2008/08/13578175716279.html