This post describing multinode OpenStack installation on centos7/rhel7 for Liberty release. If you want to do single node installation please refer my earlier post.
We are installing OpenStack onto 3 nodes controller,compute and network using packstack utility
Following is 3 node Openstack Architecture and related Openstack services running on respective nodes. I am using two network one is management network of 192.168.56.* which is used for internal communication between nodes and one external network used to assign public IP to VM and to access instances/VM from outside. I am also using NATed DHCP ip on each nodes to download required filesets from internet.
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Following is my network details from these three nodes
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My VirtualBox configuration of these three nodes are as follows. 2GB memory to controller and compute and 1GB memory to network node is sufficient and given 2 processor to compute node to handle load on created VM on top of it.
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Once you installed centos/rhel 7 on VM perform yum update and reboot the system then after reboot edit /etc/hosts and /etc/hostname files and add following host entries and respective hostname.
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SELINUX security will not allow to run some openstack services on ports so change the mode of SELINUX to permissive on all nodes.
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NetworkManager is also create issues in Openstack networking connection between VMs so stop it and disable it on all 3 nodes.
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Check that you can do passwordless SSH login to other nodes from controller node.
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Now we are ready for Openstack Installation. Perform all following step from controller node only. Install rdo-release.rpm from rdomanager site which contains latest OpenStack release repository.
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After this install packstack utility which help to install Openstack bundles.
#yum install -y openstack-packstack
Now generate answer configuration file which contains all default configuration used to install openstack. I am generating this answer.cfg file because I don’t want to install Openstack using packstack with default configuration.
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Edit the configuration file and set respective controller, compute & network node IP details and set password of all services to openstack.
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Now start the installation of Openstack using packstack by providing modifies answers.cfg file.
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Once packstack installation is completed you will get following information.
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now just login to dashboard using http://192.168.56.101/ using username admin password is openstack which we have provided in answer.cfg file.
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You can check the Openstack services status from controller node after sourcing keystone_admin file
#source keystone_admin
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Thats it your OpenStack setup is ready for testing Enjoy 
Thank you very explicit
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