Centrify Express is a comprehensive suite of free Active Directory-based integration solutions for authentication, single sign-on, remote access, file-sharing, monitoring. In this tutorial, you will learn how to install Centrify Express  on CentOS

Step 1: Downloading

Go to Centrify Agent Download site.

Click the Centrify Agent for CentOS Linux 64-bits or any Distro you are interested in

Fill up the registration form and download the centrify-suite-2012.3-rhel3-x86_64.tgz which is about 26MB

After downloading, you may wish to create a directory to unpacked the content of centrify-suite-2012.3.rhel3-x86_64.tgz

The most important is centrifydc-5.0.2-rhel3-x86_64.rpm for the basic installation. but I install the centrifydc-openssh-5.9p1-4.5.4-rhel3-x86_64.rpm as well

Step 2: Installing the packages

# rpm -Uvh centrifydc-5.0.2-rhel3-x86_64.rpm

# rpm -Uvh centrifydc-openssh-5.9p1-4.5.4-rhel3-x86_64.rpm

Step 3: Join the Server to Active Directory

# adjoin -u ou_or_domain_admin -c ou=Servers,ou=Resources,ou=IT -w company_domain

1. The ou_or_domain_admin account should be able to join the Linux Server to the Active Directory
2. ou=Servers,ou=Resources,ou=IT is written with ou=Servers is written with the container nearest the name of the server is written first and all the backward to the main OU

You will be prompted to  enter the password and you should see console messages some like this

userid@company_domain's password:
Using writable domain controller: server1_company_domain
Join to domain:company_domain, zone:Auto Zone successful

Step 4: To restart the Centrify AD authentication daemon

# adflush
# adreload

Step 5: To deprovision the Server from Active Directory

# adleave -u ou_or_domain_admin -r

Using writable domain controller: xxxx.xxxx.xxxx.xxxx.xxx.xxx
Centrify DirectControl stopped.