Deploying OpenLDAP

Deploying OpenLDAP 117

Posted by timothy on Monday March 14, 2005 @04:30PM from the eldap-hubbard dept.

Dustin Puryear writes "I work extensively with LDAP as a consultant, and so I'm always reading the latest and greatest books and articles on the subject. It's just part of the business. So I was excited to see "Deploying OpenLDAP," by Tom Jackiewics and published by Apress, on Amazon's electronic bookshelf. After reviewing the Table of Contents I quickly ordered the book. This looked good. After all, Jackiewicz had some great chapter titles such as 'Implementing Deployment, Operations, and Administration Strategies.' That just sounds smart. Before giving you my feelings on the book, let me first say that I'm already well experienced with LDAP. This is especially true with OpenLDAP. With a title like "Deploying OpenLDAP" I was expecting a book that tackled not just low-level tactical issues such as installing OpenLDAP binaries, but strategic ones as well, e.g., how to design access control. So if you have never used OpenLDAP then your experience with the book may differ." Read on for the rest of Puryear's review.

Deploying OpenLDAP
author	Tom Jackiewicz
pages	344
publisher	Apress
rating	5
reviewer	Dustin Puryear
ISBN	1590594134
summary	HOWTO for installing and using OpenLDAP.

The book begins with a quick note that the target audience is those wishing to install and configure OpenLDAP, and not those that wish to delve into the intricacies of LDAP architecture. Unfortunately, Jackiewics delivers on this promise. While I didn't expect the book to provide me with a guide on enterprise-level LDAP deployment, I had hoped to see more focus placed on design, but that wasn't forthcoming.

The first chapter, "Accessing Your Environment," is a moderately good review of how to identify key elements of your company that are appropriate for inclusion in a directory service. In addition, Jackiewics makes a clear case that an LDAP directory is not a relational database -- so don't try to replace Oracle with OpenLDAP. A very good point.

Chapter 2, "Understanding Data Definitions," provides background information on how schemas are defined. Basically, a schema is just the types of object classes and attributes that your directory supports. Jackiewics actually does a good job covering customized schemas, which is a troublesome area for new OpenLDAP administrators.

It was in Chapter 3, "Implementing Deployment, Operations, and Administration Strategies," that I was hoping to get some real nuggets of information. Alas, that wasn't forthcoming. The chapter should be renamed to "Where to put your OpenLDAP server on the network, and what to name the server." There are some areas of this chapter that really disappointed me. The most culpable: Jackiewics spends almost four pages explaining how to come up with a good hostname for your server, and then a brief page on understanding OpenLDAP's log file, and that brief page mostly contains example output. This chapter is also a good example of a bad book layout -- why are we reading about hostname conventions in the same chapter that discusses debug output?

Chapter 4, "Installing OpenLDAP," is a decent HOWTO for installing OpenLDAP. It also provides several manpages in case you accidentally deleted the 'man' command on your own system.

Chapter 5, "Implementing OpenLDAP," is kind of the "catch all" chapter. Jackiewics discusses how to decide on hardware, but his examples aren't very clear. One of the real gems of the book is his discussion on SASL and OpenLDAP. In addition, there is a reasonable discussion of replication between OpenLDAP servers. Alas, there is almost no troubleshooting on replication, and replication does hiccup at times. (Indeed, this book contains essentially no help in troubleshooting any problems.) Another sore point: Jackiewics only provides a single paragraph on access control (i.e., OpenLDAP ACLs). That topic alone deserves its own chapter.

Because Jackiewics had specifically stated that this book's scope was quite narrow I would typically be more lenient. However, Chapter 6, "Scripting and Programming LDAP," consumes sixty pages that are immediately outside the book's scope. I would prefer to see this chapter removed entirely, and the sixty pages devoted to a chapter on troubleshooting OpenLDAP and deciphering slapd's debug log file, and perhaps another chapter on designing a scalable replication infrastructure using OpenLDAP. Unfortunately, what we get is essentially sixty pages of manpages and documentation labeled as "Scripting and Programming LDAP."

Jackiewics closes the book with Chapter 7, "Integrating at the System Level," and Chapter 8, "Integrating OpenLDAP with Applications, User Systems, and Client Tools."

Chapter 7 discusses how to replace "old technology," such as NIS and Sendmail alias files, with LDAP. Not a bad chapter, although Jackiewics continues to delve too far into man-page material. Chapter 8 provides examples of using LDAP in Apache, Pine, Samba, and various other types of clients.

Overall, I would say that I left this book with little new information. People that are just now installing OpenLDAP may find the book beneficial, but I really didn't see any material that stood out. My personal belief is that this "Deploying OpenLDAP" needs to provide far more troubleshooting and example deployment scenarios and less regurgitation of manpages and HOWTOs.

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