1NSCD(8)                    Linux Programmer's Manual                   NSCD(8)
2
3
4

NAME

6       /usr/sbin/nscd - name service cache daemon
7

DESCRIPTION

9       Nscd is a daemon that provides a cache for the most common name service
10       requests.  The default configuration file,  /etc/nscd.conf,  determines
11       the behavior of the cache daemon.  See nscd.conf(5).
12
13       Nscd  provides  caching  for  accesses  of the passwd(5), group(5), and
14       hosts(5) databases through standard libc  interfaces,  such  as  getpw‐
15       nam(3),  getpwuid(3),  getgrnam(3),  getgrgid(3), gethostbyname(3), and
16       others.
17
18       There are two caches for each database: a positive one for items found,
19       and  a negative one for items not found.  Each cache has a separate TTL
20       (time-to-live) period for its data.   Note  that  the  shadow  file  is
21       specifically  not  cached.   getspnam(3)  calls  remain  uncached  as a
22       result.  As a result of this behavior it is not possible to change non-
23       nscd user to another non-nscd user via su service when nscd is running.
24

OPTIONS

26       --help will give you a list with all options and what they do.
27

NOTES

29       The  daemon will try to watch for changes in configuration files appro‐
30       priate for each database (e.g.  /etc/passwd for the passwd database  or
31       /etc/hosts  and /etc/resolv.conf for the hosts database), and flush the
32       cache when these are changed.  However, this will happen only  after  a
33       short delay (unless the inotify(7) mechanism is available and glibc 2.9
34       or later is available), and this auto-detection does not cover configu‐
35       ration files required by non-standard NSS modules, if any are specified
36       in /etc/nsswitch.conf.  In that case, you need  to  run  the  following
37       command  after  changing the configuration file of the database so that
38       nscd invalidates its cache:
39
40           $ nscd -i <database>
41

SEE ALSO

43       nscd.conf(5), nsswitch.conf(5)
44

COLOPHON

46       This page is part of release 3.22 of the Linux  man-pages  project.   A
47       description  of  the project, and information about reporting bugs, can
48       be found at http://www.kernel.org/doc/man-pages/.
49
50
51
52GNU                               2008-12-05                           NSCD(8)
Impressum