Document URL: 

Section Number and Name: 
Software Requirements 2.1

Describe the issue: 
NetworkManager is enabled in some installations of RHEL.  In some cases, NetworkManager must be manually disabled for OpenStack networking to operate correctly.

Suggestions for improvement: 
Add a section after 2.1.2
2.1.3 "Disable NetworkManager if enabled"

Some installation methods of RHEL install NetworkManager which interfere with OpenStack Networking.  If these installation methods are chosen, please manually disable NetworkManager.

No action is needed if the installation chosen is:
* Basic Server
* Database Server
* Web Server
* Identity Management Server
* Virtualization Host
* Minimal Install

NetworkManager must be disabled if the installation chosen is:
* Desktop
* Software Development Workstation

Disable network manager by running the commands

$ sudo chkconfig NetworkManager off
$ sudo service NetworkManager stop

Modify the network script related to the network interfaces in 
/etc/sysconfig/network-scripts/ifcfg-ethX where X is the interface
1. Remove the line NM_CONTROLLED=yes
2. Change ONBOOT=no to ONBOOT=yes

Additional information: 
1.
If chkconfig --list NetworkManager displays:
error reading information on service NetworkManager: No such file or directory

Then the user doesn't have to worry about making this change.

2.
If the results are:
$ chkconfig --list NetworkManager
NetworkManager 	0:off	1:off	2:on	3:on	4:on	5:on	6:off

Then the user needs to take action.