Tom Adelstein's blog

Linux 's Missing Manual Coming to a User's Group Near You

Would you like to get your hands on "Linux System Administration" and have Bill Lubanovic or me show up to your local LUG or UNIX User group meeting? Then you should contact Marsee Henon at O'Reilly. Of course, if you would rather have another author and another book she can handle that too. Marsee works with various groups around the country to make sure they have books and speakers. more>>

The Fun of LDAP - objectClass Attributes

OK - I actually like and enjoy LDAP, but do not allow that to cloud your judgment. LDAP took much more of my time and effort to learn than Bind and/or DNS. And I recall sitting in front of DNS chapters wondering why we needed another language to do something as easy as mapping a friendly name to an IP address. This jargon stuff has value though such as constraing insomnia. more>>

Commercial Linux Transforming the Community? Or Do They Need a Wakeup Call?

Last week, I had the privilege of addressing the North Texas Linux Users Group. Ralph Green asked me to present information on my upcoming book called "Linux System Administration" by O'Reilly. I only had the digital images of the cover and gallies, since the book actually goes to press in early March. So, I showed my digital images. more>>

LDAP: Attributes and Keeping Them Simple

A consensus exists among many writers about jargon. Throw a bunch of undefined words at a reader and he or she will soon fall asleep. In fact, put one term in a paragraph that the reader doesn't understand and a page or two later sleep will start to creep and the reader will lose interest. more>>

LDAP: Replacing Exchange Revisited

LDAP can occupy numerous places in an IT infrastructure. For example, you can migrate Network Information Services (NIS) to LDAP and many Legacy UNIX centric organization have done just that. While the NIS migration model serves as one excellent example, many others exist. Most recently, I saw LDAP used as a simple white page - name and address - directory service. I consider that under utilizing LDAP. more>>

Happy New Year - What's Ahead?

Are you glad that New Year only occurs once a year? Who wants to look back and forward on the same day? It's inevitable, I suppose.

Lately, I have reflected a lot on my Linux career in contrast to other IT work and environments. Linux started in 1997 for me and encompassed about nine years. I have looked back and have looked forward to the year ahead. I certainly have plans and hope you do also. But before looking ahead at our plans, we might examine our personal history to give ourselves a context in which to view a future with full knowledge that the best laid plans often go astray. more>>

Directory Services as the Foundation of Organizational Infrastructures

If you have followed any of my last six installments about LDAP, then you know we've taken a technical approach to the subject. I wrote the majority of the material in this series as part of an O'Reilly book entitled "Linux System Administration" or simply LSA. You can find a write-up on the book at this link. more>>

LDAP Series Part VI - Directory Service Modeling

LDAP services exist in a TCP/IP context. It's an Internet service that uses daemons, requires an administrator, configuration files and structure. In some ways LDAP resembles a Linux file system with a root, limbs instead of directories, etc. Unlike the directory configuration of an operating system, LDAP is flexible in its structuring. That flexibility translates into a design makeup you can simply create. We call the hierarchical model a Directory Information Tree (DIT). Whoever designs the DIT needs to know something about how to model data. more>>

LDAP Series Part V - Getting a Grip on Directory Service Modeling

I have an observation I'd like to disclose about the Open Source community: We tend to leap into all kinds of things before we have all the facts and/or information necessary to make intelligent decisions. We criticize other communities, laugh at things like directory services from the two major NOS players, talk about all our great applications, etc. We hang on to old notions about what makes Linux tick. Sorry, but that model ESR defined doesn't fit any more. The community natter appears to come mostly from people who lack deep technical skills and knowledge of enterprises. more>>

LDAP Series Part IV - Installing OpenLDAP on Debian Plus Some LDAP Commentary

I can imagine the comments we'll see on this article. What about X distribution? And so on... I'm not going to justify my reasons for choosing Debian. You can use whatever distro you want. It's just a matter of preference. more>>

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