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Failed to scheduler_run_instance: No valid host was found

asked 2014-03-28 13:18:18 -0500

slimix00 gravatar image

updated 2014-03-28 13:19:17 -0500

Hi, please help

I'm stuck with this error since a month.

I corrected every single error found in log files, but I still can't launch an instance. nova-scheduler.log/nova-compute.log/nova-cert.log/nova-conductor.log/nova-api.log/nova-network.log =>>>>> Are clean

Well , when i put this command : nova show [instance_id], I can see the following message :

{u'message': u'No valid host was found. ', u'code': 500, u'details': u' File "/usr/lib/python2.7/dist-packages/nova/scheduler/", line 107, in schedule_run_instance | | | raise exception.NoValidHost(reason=

No valid host means what please ?

PS : I'm working on a single server Pleaaaaaaaaaaaaase help

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At least the conductor should contain an error log. Are you sure you are looking at the right file? You need to check log entries that were created at roughly the same time as the instance.

Bernd Bausch gravatar imageBernd Bausch ( 2017-04-10 01:36:04 -0500 )edit

"no valid host found" means your compute host is unable to run the instance. This can be due to lack of memory or storage, or wrong CPU type, or wrong hypervisor, or one of many other possible reasons. Usually, you will find the reasons for rejecting or selecting a host in the scheduler log.

Bernd Bausch gravatar imageBernd Bausch ( 2017-04-10 01:38:33 -0500 )edit

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answered 2017-04-10 01:21:15 -0500

Teera W. gravatar image

Can you manually create volume? (From Volumes tab in dashboard) If not please check disk space that cinder volumes have located, by default will be /var (/var/lib/cinder/cinder-volumes)

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Cinder volumes have nothing to do with instances, except if the instance is booted from a volume. Still, they won't generate "no valid host" errors.

Bernd Bausch gravatar imageBernd Bausch ( 2017-04-10 01:36:51 -0500 )edit

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Asked: 2014-03-28 13:18:18 -0500

Seen: 145 times

Last updated: Apr 10 '17