On Thu, 2014-01-16 at 17:41 +0900, NOTSU Arata wrote: > Hello, > > I'm trying to add a new configuration option for Neutron OVS agent. Although > I've submitted a patch and it is being reviewed [1], I'm posting to this > mailing list seeking opinion from a wider range. > > At present, when you deploy an environment using Neutron + OVS + GRE/VXLAN, > you have to set local_ip for tunnelling in neutron agent config (typically > ovs_neutron_plugin.ini). As each host has different local_ip, preparing and > maintaining the config files is a cumbersome work. > > So, I would like to introduce automatic configuration of local_ip in Neutron. > Although such a management should be done by some management system, Neutron > having this feature cloud be also helpful to the deployment system. It would > reduce the need for the systems to implement such a feature on their own. > > Anyway, with this feature, instead of setting an actual IP address to > local_ip, you set some options (criteria) for choosing an IP address suitable > for local_ip among IP addresses assigned to the host. At runtime, OVS agent > will choose an IP address according to the criteria. You will get the same > effect as you set local_ip=<the IP address> by hand. > > The question is, what criteria is appropriate for the purpose. The criteria > being mentioned so far in the review are: > > 1. assigned to the interface attached to default gateway > 2. being in the specified network (CIDR) > 3. assigned to the specified interface > (1 can be considered a special case of 3) > > Any comment would be appreciated.
Hi Arata, I definitely understand the thoughts behind your patch. However, I believe this falls under the realm of configuration management tools (Chef/Puppet/Ansible/Salt/etc). As an example of how the OpenStack Chef cookbooks deal with this particular problem, we inject a local_ip variable into the ovs_neutron_plugin.ini.erb template [1]. This local_ip variable is assigned in the common.rb recipe [2]. The deployer can either manually set the local_ip to an address by setting the node's attribute directly, or the deployer can have the local_ip address determined based on a named network interface. See the code at [2] for this switching behavior. In summary, I believe it's best left to configuration management systems to do this type of thing (configuration of many nodes in a structured fashion), instead of having Neutron do this itself. Best, -jay [1] https://github.com/stackforge/cookbook-openstack-network/blob/master/templates/default/plugins/openvswitch/ovs_neutron_plugin.ini.erb#L111 [2] https://github.com/stackforge/cookbook-openstack-network/blob/master/recipes/common.rb#L125 _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
