I am following the "official" installation guide to build two separate lab environments using Havana with Neutron, each with a three-node configuration: controller, network, and compute. One environment runs on Ubuntu 12.04 LTS and the other on Scientific Linux 6.4. In both environments, the network node contains the "br-ex" interface which handles external connectivity for instances.
During installation of a package, Ubuntu automatically configures daemons included with it to start on boot. For example, installing the "neutron-server" package causes the neutron-server daemon included with it to start on boot. On the other hand, RHEL and derivatives such as Scientific Linux require issuing "chkconfig <daemon> on" to make a particular daemon start on boot. The Ubuntu installation guide for Neutron on a dedicated network node[1] tells me to restart the neutron-server daemon after completing configuration. It will also automatically start on boot. On the other hand, the same chapter in the RHEL installation guide[2] tells me to restart the neutron-server daemon, but excludes it from the list of daemons configured to start on boot via chkconfig. When installing Neutron on a dedicated controller node, both variants of the guide[3,4] appear to start the neutron-server daemon at boot. After completing the rest of the installation process, the only difference between the environments is whether or not the neutron-server daemon runs on the network node. Both environments seem to function normally. Does the neutron-server daemon need to run on the network node in addition to the controller node? I don't think so because Keystone only contains an endpoint for Neutron on the controller node. Can anyone with more Neutron experience confirm my suspicion? Thanks, Matt [1] http://docs.openstack.org/trunk/install-guide/install/apt/content/neutron-install.dedicated-network-node.html [2] http://docs.openstack.org/trunk/install-guide/install/yum/content/neutron-install.dedicated-network-node.html [3] http://docs.openstack.org/trunk/install-guide/install/apt/content/install-neutron.dedicated-controller-node.html [4] http://docs.openstack.org/trunk/install-guide/install/yum/content/install-neutron.dedicated-controller-node.html
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