Error: Failed to launch instance "ubuntu14.04": Please try again later [Error: No valid host was found. ].
I've followed one of the other reports of a similar error, please find below the result of nova-manage service list:
[root@cloud ~]# nova-manage service list
Binary Host Zone Status State Updated_At
nova-consoleauth cloud.phillw.net internal enabled :-) 2015-01-18 13:15:11
nova-scheduler cloud.phillw.net internal enabled :-) 2015-01-18 13:15:17
nova-conductor cloud.phillw.net internal enabled :-) 2015-01-18 13:15:17
nova-compute cloud.phillw.net nova enabled :-) 2015-01-18 13:15:13
nova-cert cloud.phillw.net internal enabled :-) 2015-01-18 13:15:11
The over view shows plenty of resources.