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Enable true live migration

By default, the Compute service does not use the libvirt live migration functionality. To enable this functionality, add the following line to the nova.conf file:

live_migration_flag=VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,VIR_MIGRATE_LIVE

And also make sure following changes are done in compute nodes.

sed -i "s/#listen_tls.*/listen_tls=0/g" /etc/libvirt/libvirtd.conf

sed -i "s/#tcp_port.*/tcp_port =\"16509\"/g" /etc/libvirt/libvirtd.conf

sed -i "s/#tls_port.*/tls_port =\"16514\"/g" /etc/libvirt/libvirtd.conf

sed -i "s/#listen_tcp.*/listen_tcp=1/g" /etc/libvirt/libvirtd.conf

echo "auth_tcp=\"none\" " >> /etc/libvirt/libvirtd.conf

sed -i "s/#LIBVIRTD_ARGS.*/LIBVIRTD_ARGS=\"--listen\"/g" /etc/sysconfig/libvirtd

Restart the service

/etc/init.d/libvirtd restart

openstack-service restart