fix(nova): add default live_migration_inbound_addr

At the moment, if live_migration_inbound_addr is not defined it
will default to the hostname of the hypervisor which requires
DNS in order to work properly.

DNS can be complicated and it is possible that an environment
might not have it, so it makes sense to default to grabbing the
default route interface to do live migrations over in order
to allow live migrations when DNS is not setup.

Change-Id: I10eb63fc64d7cd34ef89df529637b1e81951e38c

nova/Chart.yaml

@@ -14,7 +14,7 @@ apiVersion: v1
 appVersion: v1.0.0
 description: OpenStack-Helm Nova
 name: nova
-version: 0.3.6
+version: 0.3.7
 home: https://docs.openstack.org/nova/latest/
 icon: https://www.openstack.org/themes/openstack/images/project-mascots/Nova/OpenStack_Project_Nova_vertical.png
 sources:

nova/templates/bin/_nova-compute-init.sh.tpl

@@ -23,18 +23,23 @@ mkdir -p /var/lib/nova/instances
 chown ${NOVA_USER_UID} /var/lib/nova /var/lib/nova/instances
 
 migration_interface="{{- .Values.conf.libvirt.live_migration_interface -}}"
-if [[ -n $migration_interface ]]; then
-    # determine ip dynamically based on interface provided
-    migration_address=$(ip a s $migration_interface | grep 'inet ' | awk '{print $2}' | awk -F "/" '{print $1}' | head -1)
+if [[ -z $migration_interface ]]; then
+    # search for interface with default routing
+    # If there is not default gateway, exit
+    migration_interface=$(ip -4 route list 0/0 | awk -F 'dev' '{ print $2; exit }' | awk '{ print $1 }') || exit 1
 fi
 
-touch /tmp/pod-shared/nova-libvirt.conf
-if [[ -n $migration_address ]]; then
-cat <<EOF>/tmp/pod-shared/nova-libvirt.conf
+migration_address=$(ip a s $migration_interface | grep 'inet ' | awk '{print $2}' | awk -F "/" '{print $1}' | head -1)
+
+if [ -z "${migration_address}" ] ; then
+  echo "Var live_migration_interface is empty"
+  exit 1
+fi
+
+tee > /tmp/pod-shared/nova-libvirt.conf << EOF
 [libvirt]
 live_migration_inbound_addr = $migration_address
 EOF
-fi
 
 hypervisor_interface="{{- .Values.conf.hypervisor.host_interface -}}"
 if [[ -z $hypervisor_interface ]]; then

releasenotes/notes/nova.yaml

@@ -75,4 +75,5 @@ nova:
   - 0.3.4 Add OVN values_override, disable dependency to ovn-agent and vif configs for ovn
   - 0.3.5 Replace node-role.kubernetes.io/master with control-plane
   - 0.3.6 Fix VNC access issues
+  - 0.3.7 Fix live migration without DNS resolution
 ...