my_ip needs to be set when multiple network present

[Liang Chen]

The nova-compute charm doesn't set my_ip config option. This can be problematic when there are multiple network connections on the compute node. Because nova-compute will just pick the IP that assocates to the NIC connected to the outside world (NIC to default gateway) by default, and that may not be the desired one for communications between openstack services.

[James Page (james-page)]

Hi Liang

Your proposed change looks OK, but I'd like to understand exactly what issues this is causing you before we land it; this might overlap with the network splits work we delivered last cycle.

[Liang Chen (cbjchen)]

Hi James,
This issue is reported from a customer at salesforce 00074645 where they have two networks connecting the openstack hosts, and they would like one of them to be dedicated for openstack inter service communication and the other one for some general administration usage. The bootstrap process picked up the right network, thus all the service endpoint setting getting the right one. But my_ip is by default the ip connecting to default gateway. In the case of salesforce 00074645, the default my_ip points at the general administration network, which is not what the customer wants. And also in general it can create an inconsistency for the network usage of inter openstack service communication - the service endpoints and my_ip should at least use the same network connection.

[Liang Chen (cbjchen)]

This also needs to be fixed in nova-cloud-controller.