Live migration fails when executing the QEMU command `migrate-set-capabilities`. This is because the post-copy feature that is enabled by default is not supported. + Choose one of the following workaround options: * Workaround Option 1: Set `vm.unprivileged_userfaultfd = 1` on Compute nodes to enable post-copy on the containerized libvirt: ** Make a new file: `$ touch /etc/sysctl.d/50-userfault.conf`. ** Add `vm.unprivileged_userfaultfd = 1` to `/etc/sysctl.d/50-userfault.conf`. ** Load the file: `$ sysctl -p /etc/sysctl.d/50-userfault.conf`. * Workaround Option 2: Set the `sysctl` flag through director, by setting the `ExtraSysctlSettings` parameter. * Workaround Option 3: Disable the post-copy feature completely, by setting the `NovaLiveMigrationPermitPostCopy` parameter to `false`.