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Run this on the controller node - before starting openstack-nova services. It fixes DHCP resolution on the same controller host.

iptables -A POSTROUTING -t mangle -p udp --dport 68 -j CHECKSUM --checksum-fill

https://ask.openstack.org/en/question/3460/is-it-possible-to-run-instances-on-the-cloud-controller-as-well/