Note: This tutorial assumes you've already followed the NetBSD on SDF VPS tutorial to set up networking, the time zone and pkgsrc using the SDF VPS pkgsrc.
An LDAP server can be used for an endless number of things. Essentially, LDAP is just an object-oriented hierarchical database. Common uses include authentication and authorisation, host management, a backend for Kerberos, a backend for a DHCP server, a shared address book and forming a part of some public key infrastructures.
In this tutorial, I will be setting up the LDAP server to provide authorisation and authentication for a *nix client, but the first few stages are the same for almost any application of LDAP.
The OpenLDAP server is available in the SDF VPS pkgsrc and so the software is already installed, but does require some configuration.