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First . Question

packstack --gen-answer-file  answer-custom.txt
In  answer-custom.txt set CONFIG_NAGIOS_INSTALL=n
packstack --answer-file=./answer-custom.txt

Second Question:-
http://bderzhavets.blogspot.com/2015/05/rdo-kilo-set-up-three-kvms-nodes.html

CONFIG_CONTROLLER_HOST=192.169.142.127
CONFIG_COMPUTE_HOSTS=192.169.142.137
CONFIG_NETWORK_HOSTS=192.169.142.127

Sample schema would work for real boxes with same interfaces names as well
Say eth0=enps3s0,eth1= enps5s0
Replace IPs for management network with yours IPs and set IPs for VTEPS (VXLAN tunnel endpoints)
Otherwise, see http://bderzhavets.blogspot.com/2015/04/switching-to-ethx-interfaces-on-fedora.html

First . Question

packstack --gen-answer-file  answer-custom.txt
In  answer-custom.txt set CONFIG_NAGIOS_INSTALL=n
packstack --answer-file=./answer-custom.txt

Second Question:-
http://bderzhavets.blogspot.com/2015/05/rdo-kilo-set-up-three-kvms-nodes.html

CONFIG_CONTROLLER_HOST=192.169.142.127
CONFIG_COMPUTE_HOSTS=192.169.142.137
CONFIG_NETWORK_HOSTS=192.169.142.127

Sample schema would work for real boxes with same interfaces names as well
Say eth0=enps3s0,eth1= enps5s0
Replace IPs for management network with yours IPs and set IPs for VTEPS (VXLAN tunnel endpoints)endpoints).
Otherwise, see http://bderzhavets.blogspot.com/2015/04/switching-to-ethx-interfaces-on-fedora.html
Tune external network as you need . In case of two node deployment mgmt network may work as external.

First . Question

packstack --gen-answer-file  answer-custom.txt
In  answer-custom.txt set CONFIG_NAGIOS_INSTALL=n
packstack --answer-file=./answer-custom.txt

Second Question:-
http://bderzhavets.blogspot.com/2015/05/rdo-kilo-set-up-three-kvms-nodes.html

CONFIG_CONTROLLER_HOST=192.169.142.127
CONFIG_COMPUTE_HOSTS=192.169.142.137
CONFIG_NETWORK_HOSTS=192.169.142.127

Sample schema would work for real boxes with same interfaces names as well
Say eth0=enps3s0,eth1= enps5s0
Replace IPs for management network with yours IPs and set IPs for VTEPS (VXLAN tunnel endpoints).
Otherwise, see http://bderzhavets.blogspot.com/2015/04/switching-to-ethx-interfaces-on-fedora.html
Tune external network as you need . In case of two node deployment mgmt network may work as external.
Packstack presumes deployment on virgin HW with CentOS 7.1 installed. KVM on Compute node will be reinstalled anyway.

UPDATE 1

Couple of things : 
>1. I deployed packstack all in one in virgin HW with centosOS - perfect. 
>2. so , what is your recommendation ? i thought the compute nodes and controller are the same 
    No that is not the same
  > 2.1 The virgin harware which I have now for testing is brand new and quite powerful. 
  > 2.2 is it okay or good practice to have openstack and compute node in same machine ?
      That is bad practice
  > 2.3 I have physical two interface, as you say enps3s0 and enps5s0, and wanted to configure enps5s0 interface to be used by all the virtual machine that will be created via openstack dashboard. 
    Wrong understanding.
    NICs enp3s0 support MGMT network , which might be external at the same time.
    NICs enp5s0 support VXLAN tunnel.
> 3. No, I did not mean to install openstack on already existing kvm (this will be my brand new setup) 
> 4. I have two virgin hardware which I wanted to deploy openstack. 
> 5. As for the storage (storing those VMs), i think it uses the same as KVM default location i.e /var/lib/libvirt/images ... so > I can get the SANN chunk and mount on that directly.
  No experience with SANN. If it's just NFS mount with same ext4fs or XFS shouldn't be a problem

Howto (would work for RDO Kilo on CentOS 7.1) :-
1. http://bderzhavets.blogspot.com/2014/11/rdo-setup-two-real-node.html ( ignore Gluster 3.5.2 setup )
2. http://bderzhavets.blogspot.com/2015/05/rdo-kilo-set-up-three-kvms-nodes.html ( General concepts )
In your case Controller && Network Nodes should be deployed on one box

CONFIG_CONTROLLER_HOST=192.169.142.127
CONFIG_COMPUTE_HOSTS=192.169.142.137
CONFIG_NETWORK_HOSTS=192.169.142.127

END UPDATE

First . Question

packstack --gen-answer-file  answer-custom.txt
In  answer-custom.txt set CONFIG_NAGIOS_INSTALL=n
packstack --answer-file=./answer-custom.txt

Second Question:-
http://bderzhavets.blogspot.com/2015/05/rdo-kilo-set-up-three-kvms-nodes.html

CONFIG_CONTROLLER_HOST=192.169.142.127
CONFIG_COMPUTE_HOSTS=192.169.142.137
CONFIG_NETWORK_HOSTS=192.169.142.127

Sample schema would work for real boxes with same interfaces names as well
Say eth0=enps3s0,eth1= enps5s0
Replace IPs for management network with yours IPs and set IPs for VTEPS (VXLAN tunnel endpoints).
Otherwise, see http://bderzhavets.blogspot.com/2015/04/switching-to-ethx-interfaces-on-fedora.html
Tune external network as you need . In case of two node deployment mgmt network may work as external.
Packstack presumes deployment on virgin HW with CentOS 7.1 installed. KVM on Compute node will be reinstalled anyway.