Showing posts from August, 2012

Enable CentOS 5.8 GNU / Linux Authentication on Windows Domain

In case you should ever be finding yourself having to configure your CentOS 5.8 GNU/Linux machines to allow active directoy windows users to login to them, this post will help.

While there are a few ways to set this up, i.e., likewise-open (see, centrify (, the built-in System, Authentication graphical controls in CentOS, etc., the method in this post focuses on touching just a few config files to enable active directory  authentication. K.I.S.S. is the way I like to roll.

Using the authentication methods below assume that you have already enabled services for Unix on your active directory server and that the users that would be logging in to CentOS have their Unix tab (on ad user and computers) populated with values.

The Authentication methods outlined here use LDAP and Kerberos. LDAP brings the UID/GID information (from the Unix tab in ad) for the user, and Kerberos provides for username/password authentication piece.

With the default install of CentOS…

How To Install Clearcase 7.1.1 on CentOS 5.8

First of all, if you're going to have to use source control, get something FOSS - like git, or subversion, or mercurial, etc. Here's a great list on

Otherwise, if you're one those poor bastards that are tasked(like me) with installing the less-than-FOSS IBM Rational Clearcase (c) (version 7.1.1) on the CentOS 5.8 GNU/Linux machine, you've come to the right place for some notes on a real installation.

Basically, IBM Clearcase does not include support for CentOS. To make things worse - the IBM installer will actually fail the install for "unsupported operating system" when installing on the non-supported operating system. As to why the IBM installer doesn't have the option to "try anyway" is beyond me, but since it doesn't, we will have to resort to other means.

Luckily, it is rather easy to workaround the "unsupported operating system" problem. To install Clearcase on CentOS 5.8, we simply have to trick it int…