I tried to follow the instructions at openstack.redhat.com/Quickstart on my bare-metal server running CentOS 7 x86_64, which is binary compatible with RHEL 7. The installation failed with the following output:

# packstack --allinone
Welcome to Installer setup utility
Packstack changed given value  to required value /root/.ssh/id_rsa.pub

Installing:
Clean Up                                             [ DONE ]
Setting up ssh keys                                  [ DONE ]
Discovering hosts' details                           [ DONE ]
Adding pre install manifest entries                  [ DONE ]
Preparing servers                                    [ DONE ]
Adding AMQP manifest entries                         [ DONE ]
Adding MySQL manifest entries                        [ DONE ]
Adding Keystone manifest entries                     [ DONE ]
Adding Glance Keystone manifest entries              [ DONE ]
Adding Glance manifest entries                       [ DONE ]
Adding Cinder Keystone manifest entries              [ DONE ]
Adding Cinder manifest entries                       [ DONE ]
Checking if the Cinder server has a cinder-volumes vg[ DONE ]
Adding Nova API manifest entries                     [ DONE ]
Adding Nova Keystone manifest entries                [ DONE ]
Adding Nova Cert manifest entries                    [ DONE ]
Adding Nova Conductor manifest entries               [ DONE ]
Creating ssh keys for Nova migration                 [ DONE ]
Gathering ssh host keys for Nova migration           [ DONE ]
Adding Nova Compute manifest entries                 [ DONE ]
Adding Nova Scheduler manifest entries               [ DONE ]
Adding Nova VNC Proxy manifest entries               [ DONE ]
Adding Openstack Network-related Nova manifest entries[ DONE ]
Adding Nova Common manifest entries                  [ DONE ]
Adding Neutron API manifest entries                  [ DONE ]
Adding Neutron Keystone manifest entries             [ DONE ]
Adding Neutron L3 manifest entries                   [ DONE ]
Adding Neutron L2 Agent manifest entries             [ DONE ]
Adding Neutron DHCP Agent manifest entries           [ DONE ]
Adding Neutron LBaaS Agent manifest entries          [ DONE ]
Adding Neutron Metering Agent manifest entries       [ DONE ]
Adding Neutron Metadata Agent manifest entries       [ DONE ]
Adding OpenStack Client manifest entries             [ DONE ]
Adding Horizon manifest entries                      [ DONE ]
Adding Swift Keystone manifest entries               [ DONE ]
Adding Swift builder manifest entries                [ DONE ]
Adding Swift proxy manifest entries                  [ DONE ]
Adding Swift storage manifest entries                [ DONE ]
Adding Swift common manifest entries                 [ DONE ]
Adding Provisioning Demo manifest entries            [ DONE ]
Adding MongoDB manifest entries                      [ DONE ]
Adding Ceilometer manifest entries                   [ DONE ]
Adding Ceilometer Keystone manifest entries          [ DONE ]
Adding Nagios server manifest entries                [ DONE ]
Adding Nagios host manifest entries                  [ DONE ]
Adding post install manifest entries                 [ DONE ]
Installing Dependencies                              [ DONE ]
Copying Puppet modules and manifests                 [ DONE ]
Applying 192.168.0.110_prescript.pp
192.168.0.110_prescript.pp:                       [ ERROR ]           
Applying Puppet manifests                         [ ERROR ]

ERROR : Error appeared during Puppet run: 192.168.0.110_prescript.pp
Error: comparison of String with 7 failed at /var/tmp/packstack/8be30bf1dcd84c55b7add1a41967b45f/manifests/192.168.0.110_prescript.pp:15 on node localhost.rhbd.psu.edu
You will find full trace in log /var/tmp/packstack/20140721-231129-KPwu9k/manifests/192.168.0.110_prescript.pp.log
Please check log file /var/tmp/packstack/20140721-231129-KPwu9k/openstack-setup.log for more information

Additional information:
 * A new answerfile was created in: /root/packstack-answers-20140721-231129.txt
 * Time synchronization installation was skipped. Please note that unsynchronized time on server instances might be problem for some OpenStack components.
 * File /root/keystonerc_admin has been created on OpenStack client host 192.168.0.110. To use the command line tools you need to source the file.
 * To access the OpenStack Dashboard browse to http://192.168.0.110/dashboard .
Please, find your login credentials stored in the keystonerc_admin in your home directory.
 * To use Nagios, browse to http://192.168.0.110/nagios username: nagiosadmin, password: [redacted]