I had the same issue when AppArmor is active (default)
and when I try to enable qemu guest agent inside your
guest :
virsh start test
error: Failed to start domain test
error: internal error: process exited while connecting to monitor:
qemu-system-x86_64: -chardev
socket,id=charchannel0,path=/var/lib/libvirt/qemu/test-virtio.sock,server,nowait:
Failed to bind socket: Permission denied
qemu-system-x86_64: -chardev
socket,id=charchannel0,path=/var/lib/libvirt/qemu/test-virtio.sock,server,nowait:
chardev: opening backend "socket" failed
audit: type=1400 audit(...): apparmor="DENIED" operation="mknod" profile
="libvirt-74c30212-4631-4498-a684-c62db8b2dc21"
name="/var/lib/libvirt/qemu/test-virtio.sock" pid=10291 comm="qemu-
system-x86" requested_mask="c" denied_mask="c" fsuid=106 ouid=106
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='writeback' discard='unmap'/>
<source dev='/var/lib/libvirt/images/test.raw'/>
<target dev='sda' bus='scsi'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='scsi' index='0' model='virtio-scsi'>
</controller>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<channel type='unix'>
<source mode='bind' path='/var/lib/libvirt/qemu/test-virtio.sock'/>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
I am using qemu guest agent to be able to call guest-fstrim
virsh qemu-agent-command <domain> '{"execute":"guest-fstrim"}'
guest-fstrim is doing fstrim on all partitions if discard has been
enabled with virtio-scsi (free up deleted blocks)
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https://bugs.launchpad.net/bugs/1227912
Title:
instance fails to boot with qemu guest agent set in image metadata
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