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   7 .TH YPFILES 4 "Feb 25, 2017"
   8 .SH NAME
   9 ypfiles \- Network Information Service Version 2, formerly known as YP
  10 .SH DESCRIPTION
  11 .LP
  12 The NIS network information service uses a distributed, replicated database of
  13 \fBdbm\fR files , in ASCII form, that are contained in the \fB/var/yp\fR
  14 directory hierarchy on each NIS server.
  15 .sp
  16 .LP
  17 A \fBdbm\fR database served by the NIS server is called a NIS \fImap\fR. A NIS
  18 \fIdomain\fR is a subdirectory of \fB/var/yp\fR that contains a set of NIS maps
  19 on each NIS server.
  20 .sp
  21 .LP
  22 Standard nicknames are defined in the file \fB/var/yp/nicknames\fR. These names
  23 can be used in place of the full map name in the \fBypmatch\fR and \fBypcat\fR
  24 commands. Use the command \fBypwhich\fR \fB-x\fR to display the current set of
  25 nicknames. Use the command \fBypwhich\fR \fB-m\fR to display all the available
  26 maps. Each line of the nickname file contains two fields separated by white
  27 space. The first field is the nickname, and the second field is the name of the
  28 map that it expands to. The nickname cannot contain a ".".
  29 .SS "NIS to LDAP (N2L)"
  30 .LP
  31 If the \fB/var/yp/NISLDAPmapping\fR configuration file is present, the NIS
  32 server operates in NIS to LDAP (N2L) mode. In this mode, NIS maps are stored in
  33 a new set of DBM files, prepended by the \fBLDAP_\fR prefix, at
  34 \fB/var/yp/\fIdomainename\fR\fR. These files are used as a cache backed by
  35 information from an LDAP server. Additional DBM files are created in the same
  36 directory to hold the cache's TTL values.
  37 .sp
  38 .LP
  39 N2L mode enables NIS clients to be supported in an LDAP environment.
  40 .sp
  41 .LP
  42 In N2L mode, the old style DBM files, NIS source files, and the
  43 \fBypmake\fR(1M) utility have to role. They are retained to enable easy
  44 conversion back to the traditional mode, if required.
  45 .SS "Converting from N2L to Traditional NIS"
  46 .LP
  47 When NIS is operating in N2L mode, it uses a new set of NIS maps with an
  48 \fBLDAP_\fR prefix, based on the contents of the LDAP DIT. The NIS source files
  49 are unused and become out of date. If you wish to convert back to the
  50 traditional NIS mode, the N2L configuration file should be deleted. The system
  51 will then return to using the standard map files. Optionally, the N2L mode map
  52 files, \fB/var/yp/*/LDAP_*\fR can also be deleted.
  53 .sp
  54 .LP
  55 If you want to run the system in traditional mode with information based on the
  56 DIT, then the NIS source files must be regenerated based on the N2L maps. To
  57 regenerate the NIS source files based on the N2L maps, run \fBypmap2src\fR(1M).
  58 .SH FILES
  59 .ne 2
  60 .na
  61 \fB\fB/var/yp\fR\fR
  62 .ad
  63 .sp .6
  64 .RS 4n
  65 Directory containing NIS configuration files.
  66 .RE
  67 
  68 .sp
  69 .ne 2
  70 .na
  71 \fB\fB/var/yp/binding\fR\fR
  72 .ad
  73 .sp .6
  74 .RS 4n
  75 Stores the information required to bind the NIS client to the NIS server.
  76 .RE
  77 
  78 .sp
  79 .ne 2
  80 .na
  81 \fB\fB/var/yp/binding/\fIypdomain\fR/ypservers\fR\fR
  82 .ad
  83 .sp .6
  84 .RS 4n
  85 Contains the servers to which the NIS client is allowed to bind.
  86 .RE
  87 
  88 .sp
  89 .ne 2
  90 .na
  91 \fB\fB/var/yp/Makefile\fR\fR
  92 .ad
  93 .sp .6
  94 .RS 4n
  95 Builds the NIS \fBndbm\fR databases.
  96 .RE
  97 
  98 .sp
  99 .ne 2
 100 .na
 101 \fB\fB/var/yp/nicknames\fR\fR
 102 .ad
 103 .sp .6
 104 .RS 4n
 105 Nicknames file.
 106 .RE
 107 
 108 .sp
 109 .ne 2
 110 .na
 111 \fB\fB/var/yp/securenets\fR\fR
 112 .ad
 113 .sp .6
 114 .RS 4n
 115 Defines the hosts and networks that are granted access to information in the
 116 served domain. This file is read at startup time by \fBypserv\fR and
 117 \fBypxfrd\fR.
 118 .RE
 119 
 120 .sp
 121 .ne 2
 122 .na
 123 \fB\fB/var/yp/\fIypdomain\fR\fR\fR
 124 .ad
 125 .sp .6
 126 .RS 4n
 127 Directory containing \fBndbm\fR databases.
 128 .RE
 129 
 130 .sp
 131 .ne 2
 132 .na
 133 \fB\fB/var/yp/NISLDAPmapping\fR\fR
 134 .ad
 135 .sp .6
 136 .RS 4n
 137 NIS to LDAP configuration file
 138 .RE
 139 
 140 .sp
 141 .ne 2
 142 .na
 143 \fB\fB/var/yp/*/LDAP_*\fR\fR
 144 .ad
 145 .sp .6
 146 .RS 4n
 147 NIS to LDAP mode map files
 148 .RE
 149 
 150 .SH SEE ALSO
 151 .LP
 152 \fBldap\fR(1), \fBmakedbm\fR(1M), \fBypbind\fR(1M), \fBypinit\fR(1M),
 153 \fBypmake\fR(1M), \fBypmap2src\fR(1M), \fBypserv\fR(1M), \fBypxfrd\fR(1M),
 154 \fBndbm\fR(3C), \fBypclnt\fR(3NSL)