11.3. Length of
The length of one entry is limited by the NIS protocol to 1024
characters. You can't just increase this value and recompile the
system. Every system that uses NIS v2 expects key and data values
to be no more than 1024 bytes in size; if you suddenly make
YPMAXRECORD larger on your client and server, you will break
interoperability with all other systems on your network that use
NIS. To make it work right, you'd have to go to every vendor that
supports NIS and get them to all make the change at the same time.
Chances are you won't be able to do this.
With glibc 2.1 and newer this limit was removed from the glibc
NIS implementation. So it is possible under Linux to use longer
entries, but only if you have no other NIS clients or servers in
To allow the creation of NIS maps with a longer entry, you need
to add the --no-limit-check option to the
makedbm call in /var/yp/Makefile.
The result should look like:
DBLOAD = $(YPBINDIR)/makedbm -c -m `$(YPBINDIR)/yphelper --hostname` --no-limit-check
WARNING: This breaks the NIS protocol and even if Linux supports
it, not all Applictions running under Linux works with this
There is another way of solving this problem for /etc/group entries. This idea is from Ken
1. Break the entry into more than one line and name each group
2. keep the GID the same for all.
3. have the first entry with the right group name and the GID.
I don't put any user names in this one.
What happens is that going by user name you pick up the GID when the code
reads it. Then going the other way it stops after the first match of GID
and takes that name. It's ugly but works!