有时虚拟机创建后发现虚拟机规格太小，满足不了业务需求。于是需要在线拉伸虚拟机的规格。
修改controller和各个computer节点的nova.cnf文件，打开下面两个参数 [root@control ~]# vim /etc/nova/nova.conf [root@node ~]# vim /etc/nova/nova.conf
allow_resize_to_same_host=True scheduler_default_filters=RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter
重启服务
[root@control ~]# systemctl restart openstack-nova-api.service
openstack-nova-consoleauth.service openstack-nova-scheduler.service
openstack-nova-conductor.service openstack-nova-novncproxy.service
[root@node ~]# systemctl restart libvirtd.service openstack-nova-compute.service
