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  • LINUX man pages
  • Linux Man Page Viewer


    The following form allows you to view linux man pages.

    Command:

    nss

    
    
    

    DESCRIPTION

           Each  call  to  a  function which retrieves data from a system database
           like the password or group database is  handled  by  the  Name  Service
           Switch  implementation in the GNU C library.  The various services pro-
           vided are implemented by independent modules, each of  which  naturally
           varies widely from the other.
    
           The  default  implementations  coming  with  the  GNU  C library are by
           default conservative and do not use unsafe data.  This  might  be  very
           costly  in  some  situations,  especially when the databases are large.
           Some modules allow the system administrator to request taking shortcuts
           if  these  are known to be safe.  It is then the system administrator's
           responsibility to ensure the assumption is correct.
    
           There are other modules where the implementation changed over time.  If
           an  implementation  used  to  sacrifice speed for memory consumption it
           might create problems if the preference is switched.
    
           The /etc/default/nss file contains a number  of  variable  assignments.
           Each  variable controls the behavior of one or more NSS modules.  White
           spaces are ignored.  Lines beginning with '#' are treated as  comments.
    
           The variables currently recognized are:
    
           NETID_AUTHORITATIVE = TRUE|FALSE
                  If  set  to TRUE, the NIS backend for the initgroups(3) function
                  will accept the information from the  netid.byname  NIS  map  as
                  authoritative.   This can speed up the function significantly if
                  the group.byname map is large.  The content of the  netid.byname
                  map is used as is.  The system administrator has to make sure it
                  is correctly generated.
    
           SERVICES_AUTHORITATIVE = TRUE|FALSE
                  If set to TRUE, the NIS backend  for  the  getservbyname(3)  and
                  getservbyname_r(3)   functions   will   assume   that  the  ser-
                  vices.byservicename NIS map exists and is authoritative, partic-
                  ularly that it contains both keys with /proto and without /proto
                  for both primary service names and service aliases.  The  system
                  administrator has to make sure it is correctly generated.
    
           SETENT_BATCH_READ = TRUE|FALSE
                  If  set  to  TRUE,  the NIS backend for the setpwent(3) and set-
                  grent(3) functions will read the entire  database  at  once  and
                  then  hand  out  the  requests one by one from memory with every
                  corresponding  getpwent(3)  or  getgrent(3)  call  respectively.
                  Otherwise each getpwent(3) or getgrent(3) call might result in a
                  network communication with the server to get the next entry.
    
    
    

    FILES

           /etc/default/nss
    
    
    

    EXAMPLE

    
    
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