How to restore live migration working on Astra Linux?¶

In the OpenStack version of Train deployed on the Astra Linux operating system, when running live migration, an error like:

2020-09-16 16:50:55.024 14807 INFO nova.compute.manager [-] [instance: c6cd566e-8634-4b18-9873-f45599d140a9] Took 2.09 seconds for pre_live_migration on destination host mnode1.test.stand.loc.
2020-09-16 16:50:55.509 14807 ERROR nova.virt.libvirt.driver [-] [instance: c6cd566e-8634-4b18-9873-f45599d140a9] Live Migration failure: access denied: libvirt.libvirtError: access denied
2020-09-16 16:50:55.771 14807 ERROR nova.virt.libvirt.driver [-] [instance: c6cd566e-8634-4b18-9873-f45599d140a9] Migration operation has aborted

As result of this error, live migration is interrupted.

To solve this problem, you should disable the use of the parsec driver in libvirt.

To do this, on all compute nodes of the cloud, in the file /etc/libvirt/libvirtd.conf, comment out the parameter:

#access_drivers = [ "parsec" ]

Then restart the libvirt and nova-compute services:

systemctl restart libvirtd nova-compute