[Date Prev][Date Next]
Re: Building an LDAP database "for dummies"
Have you ever used the Domain Name System? (Yes, obviously.) Do you
understand the notion of a "hierarchical namespace"? Surely you've
already been heavily exposed to it, the filesystem on the computer
you're typing on is most likely hierarchical as well. LDAP/X.500 is no
different, these are all directories of one form or another and they
all store data in a similar fashion.
In DNS there are "TLDs" (Top Level Domains) - .com, .edu, .org, .us,
etc... Other subdomains are created underneath these domains, e.g.
openldap.org. There can be arbitrarily many subdomains nested in this
fashion, e.g. "room8.level6.LosAngeles.ca.MyCompany.com" and there can
be various other entries inside a subdomain e.g.
"printer1.room8.level6.LosAngeles.ca.MyCompany.com", printer2..., and
In creating any hierarchical tree, you have to start at the root node
and work your way down. You can't create "MyCompany.com" if ".com"
doesn't exist yet. You can't create "CA.MyCompany.com" until
"MyCompany.com" has been created.
Just like in a filesystem directory - to create /usr/local/lib/gcc you
first have to make sure that /usr, /usr/local, and /usr/local/lib
exist first, in that order.
So - "What is this tree?" - the tree is the structure you design to
contain the data you're going to store. Schema is just a description
of what kinds of data will be recognized by the server, but it doesn't
say anything about the location of the data. The tree structure gives
you the location.
This should probably be added here :