Regarding POC for 3 Node Pacemaker/Corosync HA Controller's Cluster try TripleO Quickstart ( works only on CentOS 7.2, RHEL 7.2, 32 GB Ram)
Sample of deployment template

# Deploy an HA openstack environment.
control_memory: 6144
compute_memory: 6144
undercloud_memory: 8192

# Giving the undercloud additional CPUs can greatly improve heat's
# performance (and result in a shorter deploy time).
undercloud_vcpu: 4
# Create three controller nodes and one compute node.
overcloud_nodes:
  - name: control_0
    flavor: control
  - name: control_1
    flavor: control
  - name: control_2
    flavor: control

  - name: compute_0
    flavor: compute
  - name: compute_1
    flavor: compute
# We don't need introspection in a virtual environment (because we are
# creating all the "hardware" we really know the necessary
# information).
introspect: false

# Tell tripleo about our environment.
network_isolation: true
extra_args: >-
  --control-scale 3 --compute-scale 2 --neutron-network-type vxlan
  --neutron-tunnel-types vxlan
  --ntp-server pool.ntp.org
test_tempest: false
test_ping: true
enable_pacemaker: true

Then proceed from workstation

$ git clone https://github.com/openstack/tripleo-quickstart
$ cd tripleo-quickstart
$ sudo bash quickstart.sh --install-deps
$ sudo yum -y  install redhat-rpm-config
$export VIRTHOST=192.168.1.75 #put your own IP here
$ ssh-keygen
$ssh-copy-id root@$VIRTHOST
$ssh root@$VIRTHOST uname -a # no root login prompt

Then run under tripleo-quickstart

$ bash quickstart.sh --config ./config/general_config/ha.yml  $VIRTHOST

Check report if undercloud VM has been set up :-

Access the undercloud by:
 ssh -F /home/boris/.quickstart/ssh.config.ansible undercloud

There are scripts in the home directory to continue the deploy:

 overcloud-deploy.sh will deploy the overcloud
 overcloud-deploy-post.sh will do any post-deploy configuration
 overcloud-validate.sh will run post-deploy validation

Details here :-

http://lxer.com/module/newswire/view/...
http://lxer.com/module/newswire/view/...



See also https://www.linux.com/blog/tripleo-qu...



You might find this blog http://hardysteven.blogspot.com very handy working on TripleO Quickstart

You may also want to try deploying OpenStack on a single host with OpenStack-Ansible using affinity. It will enable you to configure most of the services in a highly-available fashion using containers and haproxy. You can also run VMs on the same node or other nodes if you'd like. OSA uses LinuxBridge and not OVS for the time being.

More info can be found at: http://docs.openstack.org/developer/o...