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+##virsh usefull command
+
+- recover configuration xml from VM:  `virsh dumpxml windows7> windows7.xml`
+- start VM: `virsh start nas`
+- shutdown VM: `virsh shutdown win7`
+- rename VM: `virsh domrename --domain generic2 --new-name windows7`
+- list all vm: `virsh list --all`
+- create with xml file:`create --file debian8.xml`
+- 
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