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© 2016 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. 
Page 26 of 44 
Authenticating Linux Virtual Machines with the Microsoft Windows Active Directory Domain 
In many organizations, system administrators need to integrate Linux desktops into their existing Microsoft 
Windows Active Directory domain environments. On the surface, Linux and Windows integration appears simple. 
However, in fact, a huge number of components, configurations, and integration options are available.  
Because this study focuses on RHEL distribution authentication with Windows Active Directory, this document 
focuses on that particular Linux distribution.  
Microsoft Active Directory Deployment Prerequisites 
Before you can integrate your RHEL 6 system into an Active Directory domain, you must complete the 
prerequisites listed here. 
Windows Server 2008, 2012, and 2012 R2 Server Prerequisites 
1.  Deploy Windows Server 2008, 2012, or 2012 R2. 
2.  Configure Active Directory domain services. 
RHEL 6 System Prerequisites 
1.  Deploy RHEL 6. 
2.  Configure SELinux security parameters. 
3.  Install and configure Samba (for recommended configurations 1 and 2 only). 
4.  Synchronize time services. 
5.  Configure DNS. 
6.  Install and configure the Kerberos client. 
 
Do not proceed with the integration tasks until all of these components are fully configured and deployed. For more 
information, see the following resources: 
● 
Deployment of Windows Server 2008, 2012, and 2012:  
● 
Configuration of Active Directory domain services:  
Integrating the Linux Virtual Machine with Microsoft Active Directory 
This section presents the tasks needed to integrate RHEL 6 with Active Directory for each of the four 
recommended configurations. 
Integration Tasks 
The integration tasks are as follows: 
1.  Configure authentication. 
2.  Verify and test Active Directory. 
3.  Modify the Samba configuration. 
Using the system-config-authentication Tool 
The system-config-authentication tool simplifies the configuration of the Samba, Kerberos, security, and 
authentication files for Active Directory integration.