VM couldn't get IP after servers reboot

[Mandalavandalz]

Hello, everything is working well on running environment but yesterday we reboot all of 3 servers (controller, network and compute) and I realize that associated instance is booting well (I can access them via console on Horizon) but they couldn't get IP via quantum dhcp. If I Terminate them and running them from a Snapshot the can reach dnsmasq and getting IP whit new lease time. The questions that come up are:

• What could change after a reboot that would compromise a running network configuration?
• Could there be issues with the TAP interfaces created? What is the best way to troubleshoot such a situation?
• Has anyone seen a similar behaviour and is it specific to when we use gre-tunnels? Is it then specific to openvswitch which we are using?

[hoangvu304]

I have same problem as you. I've tried by save iptables config, kill dnsmasq process & reboot quantum-dhcp... but it's not change.

[zhenhua]

I meet the exact same problem. I tried many ways and find the solution is to restart the openvswitch service by '/etc/init.d/openvswitch-switch restart'.