On 04/22/2013 06:41 PM, Gao Yongwei wrote: > 2013/4/22 Hongbin Lu <hongbin034@xxxxxxxxx> > >> Hi. >> >> A short question. I want to know what is the proper steps to create an >> image from a running domain and use it as base image of another domains. >> The domain is with Qemu Hypervisor, persistent, and created based on Ubuntu >> Cloud image. >> >> you can use qemu-img create with -b to create a new image by point its > base to the running domain image. Careful. If the base image can still be modified, any wrapper around the base image could be invalidated by those modifications. The correct way is to take an external snapshot, so that the running image now has a read-only base and a read-write layer on top of the base; then you can create as many other qcow2 wrappers of the read-only base to have other images based from the same point in time. However, be aware that hot-cloning of guests is a very risky activity, because things such as the guest's notion of its IP address is liable to cause confusion if both guests are hooked to the same network at the same time; yet finding all spots in memory where the guest has stashed its IP address is difficult. For this reason, most cloning is done when a guest is offline, or controlled so that only one branch from a clone can ever be run at a time. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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