錯誤： 內部錯誤：early end of file from monitor, possible problem: 2020-03-18T14:35:03.329327Z qemu-system-x86_64: -drive file=/image/ubuntu-134.qcow2,format=qcow2,if=none,id=drive-virtio-disk0: Could not open backing file: Could not open '/yang/image/ubuntu-16.04.raw': Permission denied
錯誤： 內部錯誤：process exited while connecting to monitor: 2020-03-18T14:35:03.329327Z qemu-system-x86_64: -drive file=/image/ubuntu-134.qcow2,format=qcow2,if=none,id=drive-virtio-disk0: Could not open backing file: Could not open '/yang/image/ubuntu-16.04.raw': Permission denied
+ virsh define ubuntu-122.xml
定義域 ubuntu-122（從 ubuntu-122.xml）
+ virsh start ubuntu-122
錯誤： 開始域 ubuntu-122 失敗
錯誤： 內部錯誤：process exited while connecting to monitor: 2020-03-17T11:46:39.835075Z qemu-system-x86_64: -drive file=/image/ubuntu-122.qcow2,format=qcow2,if=none,id=drive-virtio-disk0,cache=none: Could not open backing file: Could not open '/image/ubuntu-12.10.raw': Permission denied
筆者分別使用Ubuntu-12.10.raw 鏡像和Ubuntu-16.04.raw 批量創建qcow2鏡像虛擬機報如上報錯，因報權限問題，經多方查找資料，及兩個不同版本操作系統實測，懷疑是將raw鏡像放於root 屬主下級目錄導致。實測以下措施可解決
1、將鏡像移到片普通用戶任意二級目錄下
root@field_A0:/yang/image# ll ubuntu-16.04.raw*
-rwxrwxrwx 1 libvirt-qemu kvm 1610612730 3月 18 22:19 ubuntu-16.04.raw*
root@field_A0:/yang/image# cp ubuntu-16.04.raw /home/fieldyang/yang/.
root@field_A0:/home/fieldyang/yang# ll ubuntu-16.04.raw*
-rwxr-xr-x 1 libvirt-qemu kvm 16106127360 3月 18 22:59 ubuntu-16.04.raw*
root@field_A0:/home/fieldyang/yang#
2、修改屬主屬組爲root
root@field_A0:/home/fieldyang/yang# chown -R root:root ubuntu-16.04.raw*
3、修改創建命令中絕對路徑
#基於ubuntu-16.04.raw創建qcow2鏡像
qemu-img create -f qcow2 -o cluster_size=2M,backing_file=/home/fieldyang/yang/ubuntu-16.04.raw ubuntu-$ip.qcow2 50G