nova-compute 有错误：
nova.root [-] Class get_connection cannot be found
如果下载了glance，再nova-compute的话，错误是：
ImportError: No module named libvirt
glance-api 也是不能开启：
ImportError：。。。各种 :(
话说羡慕嫉妒恨ubuntu。。。
搞毛的centos哟。。。
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华丽分割线
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Sandy:
1. make sure you source novarc
. novarc
2. you may need to restart the nova services. Do a 'ps' to find them and then /etc/init.d (assuming they're running as part of the package install) ... or are you running them all manually?
3. Regardless, make sure the services are running with a --flagfile=nova.conf statement in there.