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When create inactive external snapshot, after update disk definitions, virDomainSaveConfig is needed, if not after restart libvirtd the new snapshot file definitions in xml will be lost. Reproduce steps: 1. prepare a shut off guest $ virsh domstate rhel7 && virsh domblklist rhel7 shut off Target Source ------------------------------------------------ vda /var/lib/libvirt/images/rhel7.img 2. create external disk snapshot $ virsh snapshot-create rhel7 --disk-only && virsh domblklist rhel7 Domain snapshot 1417882967 created Target Source ------------------------------------------------ vda /var/lib/libvirt/images/rhel7.1417882967 3. restart libvirtd then check guest source file $ service libvirtd restart && virsh domblklist rhel7 Redirecting to /bin/systemctl restart libvirtd.service Target Source ------------------------------------------------ vda /var/lib/libvirt/images/rhel7.img This was first reported by Eric Blake http://www.redhat.com/archives/libvir-list/2014-December/msg00369.html Signed-off-by: Shanzhi Yu <shyu@redhat.com>
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>