As I was building Openstack Lab, I happen to encounter error message as it was seen on a log file from.
tail -f /var/log/nova/nova-compute.log
$ tail -f /var/log/nova/nova-compute.log 2016-03-21 22:05:34.283 1228 ERROR oslo_messaging.rpc.dispatcher rv = meth(*args, **kwargs) 2016-03-21 22:05:34.283 1228 ERROR oslo_messaging.rpc.dispatcher File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1059, in createWithFlags 2016-03-21 22:05:34.283 1228 ERROR oslo_messaging.rpc.dispatcher if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed', dom=self) 2016-03-21 22:05:34.283 1228 ERROR oslo_messaging.rpc.dispatcher libvirtError: internal error: process exited while connecting to monitor: 2016-03-22T02:05:33.427711Z qemu-kvm: -chardev file,id=charserial0,path=/var/lib/nova/instances/0b79cc65-c530-4e55-99b8-157524033d14/console.log: Could not open '/var/lib/nova/instances/0b79cc65-c530-4e55-99b8-157524033d14/console.log': Permission denied
This error came up when tried to start an instance that has been created earlier.
### With openstack CLI ### $ openstack server start
### With nova command ### $ sudo nova start
Apparently, I had had some issues manually starting kvm machines so I had played around with this file /etc/libvirt/qemu.conf
user="qemu" group="qemu" dynamic_ownership=0
To prevent this error revert the changes to:
sudo systemctl stop libvirtd
Edit qemu.conf file:
sudo vim /etc/libvirt/qemu.conf
Set the following
user="nova" group="nova" dynamic_ownership=1
Save the file then restart the libvirt daemon
sudo systemctl restart libvirtd
You should now be able to start Openstack Instance on your compute nodes.