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Ken, 

Can you take a look on the logs generated in nova-compute, maybe you’ll find a detail information about the root cause of the problem

Victor Morales



On 7/28/16, 2:34 PM, "Ken D'Ambrosio" <ken at jots.org> wrote:

>Trying to orchestrate a bunch of VMs on our ~500 core cloud, and we're 
>getting the "not enough hosts" problem.  Only issue is that the 
>dashboard seems to imply we've got the elbow room needed to instantiate. 
>  Furthermore, it would be *really handy* if I knew what the bottleneck 
>it thought was: disk, RAM, CPU, whatever.  Here's a sample of the error:
>
>----------------------- begin -----------------------
>2016-07-28 18:40:47.961 1080 WARNING nova.scheduler.utils 
>[req-977badf4-a4a2-4766-87fd-c4e3ceb2e293 
>a4c895a6fe294ae3a81e3c6bb9209f52 33c2cf3cb61c425abcb0e0d35fdf21b7 - - -] 
>[instance: ee175a40-11d9-4a43-b6e1-c4d7935acff1] Setting instance to 
>ERROR state.
>2016-07-28 18:40:51.892 1023 WARNING nova.scheduler.utils 
>[req-e2a65200-1662-4cd7-aa9e-db5e225adfa1 
>a4c895a6fe294ae3a81e3c6bb9209f52 33c2cf3cb61c425abcb0e0d35fdf21b7 - - -] 
>Failed to compute_task_build_instances: No valid host was found. There 
>are not enough hosts available.
>Traceback (most recent call last):
>
>   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/server.py", 
>line 142, in inner
>     return func(*args, **kwargs)
>
>   File "/usr/lib/python2.7/dist-packages/nova/scheduler/manager.py", 
>line 84, in select_destinations
>     filter_properties)
>
>   File 
>"/usr/lib/python2.7/dist-packages/nova/scheduler/filter_scheduler.py", 
>line 90, in select_destinations
>     raise exception.NoValidHost(reason=reason)
>
>NoValidHost: No valid host was found. There are not enough hosts 
>available.
>----------------------- begin -----------------------
>
>Any suggestions on how to track down exactly what's going wrong?
>
>Thanks!
>
>-Ken
>
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