I am running KVM on Debian 9.5 and want to use a block device in one of my VMs. Trying to start the VM (which is called "nas") I always get a permission denied error:
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virsh start nas
error: Failed to start domain nas
error: internal error: process exited while connecting to monitor: 2018-09-09T11:52:29.761625Z qemu-system-x86_64: -drive file=/dev/disk/by-id/ata-HGST_HTS541010A9E680_JD100ACC2MG2VK-part1,format=raw,if=none,id=drive-virtio-disk1,cache=none: Could not open '/dev/disk/by-id/ata-HGST_HTS541010A9E680_JD100ACC2MG2VK-part1': Permission denied
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<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source dev='/dev/disk/by-id/ata-HGST_HTS541010A9E680_JD100ACC2MG2VK-part1'/>
<target dev='vdb1' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</disk>
Can anyone tell me what permissions are missing and how to resolve this? I'm at a loss...