Hi, If all your application needs is a connection between the instances, just connect all three instances on same virtual network. Then check nova security group rules (think of it like you would of a firewall) add rules for needed ports and that's it. Instances should be able to access one another over the ports you enabled. Check these links: http://docs.openstack.org/openstack-ops/content/network_design.html docs.openstack.org/openstack-ops/content/security_groups.html REST interface, if I'm guessing what you are referring to, is the method used to manage Openstack deployments. https://wiki.openstack.org/wiki/OpenStackRESTAPI https://blueprints.launchpad.net/nova/+spec/open-stack-api Hope this help a bit. Tshefi ----- Original Message ----- From: "Sandhya S" <coolssandy at gmail.com> To: openstack at lists.openstack.org Sent: Friday, November 14, 2014 7:53:51 PM Subject: [Openstack] Openstack Hi all, My application requires three servers which are in 3 different VM's to communicate with each other. So how can it be approached? Should REST interface be deployed? Thanks _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack at lists.openstack.org Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack