What if Openstack for Newton fails to create a CVM?

< 0: LOG.warning(_LW("Treating negative config value (%(retries)s) for " "'block_device_retries' as 0."), {'retries': retries}) # (1) treat negative config value as 0 # (2) the configured value is 0, one attempt should be made # (3) the configured value is >

0, then the total number attempts # is (retries + 1) attempts = 1 if retries > = 1: attempts = retries + 1 for attempt in range (1, attempts + 1): volume = self.volume_api.get (context, vol_id) volume_status = volume ['status'] if volume_status not in [' creating' 'downloading']: if volume_status =' available': return attempt LOG.warning (_ LW ("Volume id:% (vol_id) s finished being"created but its status is% (vol_status) s."), {'vol_id': vol_id 'vol_status': volume_status}) break greenthread.sleep (CONF.block_device_allocate_retries_interval) raise exception.VolumeNotCreated (volume_id=vol_id, seconds=int (time.time ()-start), attempts=attempt Volume_status=volume_status)

There are two parameters, block_device_allocate_retries and block_device_allocate_retries_interval. By looking at the name, you can see that one is the number of attempts and the other is the interval between attempts.

5. Settlement process

Parameter default value

Block_device_allocate_retries_interval=3block_device_allocate_retries=60

Modify the interval first

Block_device_allocate_retries_interval=10

Restart nova-compute

Systemctl restart openstack-nova-compute.service

Create a CVM in the same way and find that it can be created successfully.

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