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I had a similar problem.

In my case (which I believe is exactly the samesituation here) , it was due to the fact that because of some unclear misconfiguration, nova-network did not start the dnsmasq daemon beside it is configured using a FlatDHCP manager.

So the timeout comes from the nova-network daemon waiting for an answer from a dnsmasq that nobody started.

Of course, as usual with OpenStack, there absolutely no meaningful error message anywhere...

About the misconfiguration it might be due to the fact I created a multi-host network at first (following one of the examples in the documentation). I'm not sute I have changed anything else. But now, nova-network do start dnsmasq, and at last, I can boot an image.