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There is an open source project called OpenDS that contains a nice tool called make-ldif.

make-ldif takes a template file and generates an LDIF file that contains the amount of entries you specify in the template.

To get started with make-ldif do the following:

First go to www.opends.org and install OpenDS, I recommend you have the latest Java 1.6.0 version installed.

The installation is pretty straightforward since it uses Java Web Start and I won't cover it here.

I installed OpenDS into E:\OpenDS on my Windows machine.

Under OpenDS\bat you can find the make-ldif.bat tool.
Under OpenDS\config\MakeLDIF you can find the template files.

Remember those two locations.

Go into the OpenDS\config\MakeLDIF directory and make a copy of example.template that you will edit.
Open the copy in a text editor.

The template looks something like this:

define suffix=o=ACME,C=US
define maildomain=example.com
define numusers=10001

branch: [suffix]

branch: ou=People,[suffix]
subordinateTemplate: person:[numusers]

template: person
rdnAttr: uid
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: inetOrgPerson
givenName: <first>
sn: <last>
cn: {givenName} {sn}
initials: {givenName:1}<random:chars:ABCDEFGHIJKLMNOPQRSTUVWXYZ:1>{sn:1}
employeeNumber: <sequential:0>
uid: user.{employeeNumber}
mail: {uid}@[maildomain]
userPassword: password
telephoneNumber: <random:telephone>
homePhone: <random:telephone>
pager: <random:telephone>
mobile: <random:telephone>
street: <random:numeric:5> <file:streets> Street
l: <file:cities>
st: <file:states>
postalCode: <random:numeric:5>
postalAddress: {cn}${street}${l}, {st}  {postalCode}
description: This is the description for {cn}.

To make sure it works with eDirectory I had to edit it.

I've added another objectClass value just to be sure: ndsLoginProperties

Then I changed all instances of employeeNumber into workforceID (there are two of them in the file):

employeeNumber: <sequential:0>
uid: user.{employeeNumber}

to

workforceID: <sequential:0>
uid: user.{workforceID}

When you are satisfied with the look of the template change the following row:
define numusers=10001
to a value that creates the number of entries you need, maybe 5 million???

The next step is to run the make-ldif command, open a command prompt and CD into the OpenDS\bat directory.

Run the following command:

make-ldif -o C:\Test.ldif -t E:\OpenDS\config\MakeLDIF\MyNewTemplate.template

It will create an LDIF containing all of your new entries that you can then import into eDirectory with ICE or what I would use, the ldif2dib tool.

More info about make-ldif can be found here:
https://www.opends.org/milestone1/page/MakeLdif

Info about the template files:
https://www.opends.org/wiki/page/MakeLDIFTemplateFiles

Info about ldif2dib:
http://www.novell.com/coolsolutions/appnote/17569.html

Disclaimer: As with everything else at Cool Solutions, this content is definitely not supported by Novell (so don't even think of calling Support if you try something and it blows up).

It was contributed by a community member and is published "as is." It seems to have worked for at least one person, and might work for you. But please be sure to test, test, test before you do anything drastic with it.