After restarting libvirtd, the VS hot migration fails with the following message:
"Error: internal error: Failed to reserve port."
Libvirt-4.5.0 and earlier versions
One of the possible solutions is to update the libvirt version and dependent packages to 4.6.0 or 5.0.0.
Versions of the libvirt package and its dependencies were tested nor by our QAs neither in a general CentOS repo file. Perform it at your own risk.
The update may be performed in the following way:
/etc/yum.repos.d/libvirt-latest.repofile with the following content:
[centos-libvirt-latest] gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Virtualization gpgcheck=1 name=CentOS-$releasever - libvirt-latest baseurl=http://mirror.centos.org/centos-7/$releasever/virt/$basearch/libvirt-latest/ enabled=1CODE
Clean the yum cache and update libvirt:
# yum clean all # yum update libvirtCODE
# systemctl restart libvirtdCODE
From now on, the virtual servers started after the libvirtd upgrade will be successfully migrated from compute resources with the upgraded libvirtd. For compute resources with older libvirtd packages, the issue will persist.
A bug in libvirt-4.5.0 and earlier versions prevents the migration of virtual servers.