This is the post I will use to record some of the strange errors I have encounted.
1. When image file gets moved to a different location, glance will fail to provide the image for a VM, but the instance somewhere will get multiple fixed IP addresses. This is a very strange problem. After going to the database, corrected the image_location value field records, restart glance services will resolve this error.
2. There is also a problem when instance_path is not writable by libvirt-qemu user, for some reason, each VM will get two private IPs. Make sure that the libvirt-qemu user can write to instance_path which is defined in nova.conf file.
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