Have you ever received an error message like below while working with Openstack and KVM?. If so, a fix is given here.
Command: env LC_ALL=C LANG=C qemu-img info /var/lib/libvirt/images/asterisk.qcow2 Exit code: 1 Stdout: u” Stderr: u”qemu-img: Could not open ‘/var/lib/libvirt/images/asterisk.qcow2’: Could not open ‘/var/lib/libvirt/images/asterisk.qcow2’: Permission deniedn” INFO nova.compute.resource_tracker [req-7f9e4964-52c0-4204-ae00-b74fb83acb9c – – – – -] Auditing locally available compute resources for node localhost.localdomain ERROR nova.compute.manager [req-7f9e4964-52c0-4204-ae00-b74fb83acb9c – – – – -] Error updating resources for node localhost.localdomain: Unexpected error while running command.
This is a qemu error,in the sense that nova does not have permissions to write/read to the specified qcow2 file.
Stop the libvirtd service
sudo systemctl stop libvirtd.service
Then set user and group to nova service. Set the dynamic_ownership to zero
sudo vim /etc/libvirt/qemu.conf
Set user to nova
user = "nova"
The group for QEMU processes run by the system instance. It can be specified in a similar way to user.
group = "nova"
Whether libvirt should dynamically change file ownership to match the configured user/group above. Defaults to 1.
# Set to 0 to disable file ownership changes. dynamic_ownership = 0
Save the file and restart libvirtd service
sudo systemctl start libvirtd.service
And you will be good to start your Virtual Machine.