A single machine is installed with Debian GNU/Linux OpenStack Folsom. Four instances are created and it turns out that nova-network is configured with the wrong public interface. It can be fixed without shutting down the instance:
nova suspend target1
The instance is suspended to disk (as if it was a laptop) and the corresponding KVM process is killed. While the instance is suspended, nova-network can be stopped.
The source of the problem was a typo in the public interface leading to an incorrect VLAN interface
mtu 1500 qdisc noqueue state DOWN mode DEFAULT link/ether fa:16:3e:54:5b:57 brd ff:ff:ff:ff:ff:ff
it can be fixed in the /etc/nova/nova.conf configuration file at the line:
public_interface = eth3
The incorrect VLAN interface is manually deleted and nova-network can be restarted. The instance is then resumed with
nova resume target1
and nova-network will automatically re-create the VLAN interface.
Continue reading “nova-network debugging tips”