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nova-network debugging tips

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.

/etc/init.d/nova-network stop

The source of the problem was a typo in the public interface leading to an incorrect VLAN interface

13: vlan100@eth2:  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.
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