So, you have imaged a cloud-server and then built it but learnt ‘you got network issues bra’?’
Re-Install nova-agent using this automation script, on the original server:
curl -s novaagent.myconfig.info | sudo bash
Once this is done, you should be safe to re-image your server. Provided it’s just nova-agent and you don’t have other breakage. It will make sure that nova-agent is setting your networking detail at boot time.
Hope this helps!