Resize a Running Instance on a Single Compute Node
One can resize a running instance in OpenStack by running the following nova command:
nova resize --poll
The default behavior of this command is to invoke the nova scheduler to determine the best compute node for the resized instance. If there is only one compute node in the environment, the resize will fail.
We need to tell nova to allow resizing on the same host by modifying /etc/nova/nova.conf .
Modify /etc/nova/nova.conf
allow_resize_to_same_host=True scheduler_default_filters=AllHostsFilter
By changing the default nova scheduler filter to AllHostsFilter , all compute hosts will be available and unfiltered. It is not a good idea to keep this setting in a multi-compute environment. Restart Services
After making the changes to nova.conf, restart scheduler and compute services:
service nova-scheduler restart service nova-compute restart
Resize Confirm
After resizing the instance, the status will change to VERIFY_RESIZE . One will see two copies of the instance in /var/lib/nova/instances : the original and the resized. Run the following command to verify the resize and delete the original instance:
nova resize-confirm
上面的文章我是转载的 我解释下
在你的所有控制节点和计算节点的/etc/nova/nova.conf 加入以下配置
allow_resize_to_same_host=True
scheduler_default_filters=AllHostsFilter
虽然文章说只重启scheduler服务和nova-compute服务。但是我发觉我重启了控制节点上所有的nova服务器 和计算节点上的openstack-nova-compute 服务才生效。。
重启nova-api服务，scheduler服务即可，无需重启Nova-computer
