324 lines
5.5 KiB
HTML
324 lines
5.5 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Creating and Updating NIS maps </TITLE
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="The Linux NIS(YP)/NYS/NIS+ HOWTO"
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>The Linux NIS(YP)/NYS/NIS+ HOWTO</TH
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WIDTH="10%"
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="MAPS"
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></A
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>11. Creating and Updating NIS maps </H1
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN527"
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></A
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>11.1. Creating new NIS maps </H2
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><P
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>The initial NIS maps will be created by running</P
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><TABLE
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BORDER="1"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="SCREEN"
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> % /usr/lib/yp/ypinit -m</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>This is done when setting up the NIS master server for the first
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time. For more information about this, read <A
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HREF="ypserv.html"
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>Section 9</A
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>.
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If you wish to add new maps to your server or remove old one, you
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need to edit the <TT
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CLASS="LITERAL"
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>/var/yp/Makefile</TT
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> and
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change the <TT
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CLASS="LITERAL"
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>all:</TT
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> rule. Add or remove
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the name of the rule, which generates the map.</P
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><P
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>If you delete a map, you also have to remove the corresponding
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files.</P
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><P
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>After this change, you only need to run</P
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><TABLE
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BORDER="1"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="SCREEN"
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> % make -C /var/yp</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>and the maps should be created.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN541"
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></A
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>11.2. Updating NIS maps </H2
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><P
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>If you modify the sources for the NIS maps (for example if you create
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a new user by adding the account to the passwd file), you need to
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regenerate the NIS maps. This is done by a simple</P
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><TABLE
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BORDER="1"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="SCREEN"
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> % make -C /var/yp</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>This command will check which sources have changed, creates the
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maps new and tell ypserv that the maps have changed.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN548"
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></A
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>11.3. Length of Map entries </H2
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><P
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>The length of one entry is limited by the NIS protocol to 1024 characters.
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You can't just increase this value and recompile the system. Every system
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that uses NIS v2 expects key and data values to be no more than 1024 bytes
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in size; if you suddenly make YPMAXRECORD larger on your client and server,
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you will break interoperability with all other systems on your network that
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use NIS. To make it work right, you'd have to go to every vendor that supports
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NIS and get them to all make the change at the same time. Chances are you
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won't be able to do this.</P
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><P
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>With glibc 2.1 and newer this limit was removed from the glibc NIS
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implementation. So it is possible under Linux to use longer entries,
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but only if you have no other NIS clients or servers in your network.</P
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><P
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>To allow the creation of NIS maps with a longer entry, you need to add
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the <TT
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CLASS="LITERAL"
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>--no-limit-check</TT
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> option to the
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<TT
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CLASS="LITERAL"
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>makedbm</TT
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> call in
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<TT
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CLASS="LITERAL"
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>/var/yp/Makefile</TT
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>.</P
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><P
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>The result should look like:</P
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><TABLE
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BORDER="1"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="SCREEN"
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>DBLOAD = $(YPBINDIR)/makedbm -c -m `$(YPBINDIR)/yphelper --hostname` --no-limit-check</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>WARNING: This breaks the NIS protocol and even if Linux supports it,
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not all Applictions running under Linux works with this change!</P
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><P
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>There is another way of solving this problem for
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<TT
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CLASS="FILENAME"
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>/etc/group</TT
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> entries. This idea is
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from Ken Cameron:</P
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><TABLE
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BORDER="1"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="SCREEN"
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>1. Break the entry into more than one line and name each group
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slightly differnet.
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2. keep the GID the same for all.
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3. have the first entry with the right group name and the GID.
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I don't put any user names in this one.
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What happens is that going by user name you pick up the GID when the code
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reads it. Then going the other way it stops after the first match of GID
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and takes that name. It's ugly but works!</PRE
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></FONT
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></TD
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></TR
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></TABLE
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></DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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CELLPADDING="0"
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CELLSPACING="0"
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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HREF="verification.html"
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ACCESSKEY="P"
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>Prev</A
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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HREF="index.html"
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HREF="reboot.html"
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>Next</A
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>Verifying the NIS/NYS Installation
|
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</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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> </TD
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ALIGN="right"
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VALIGN="top"
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>Surviving a Reboot</TD
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