确认两个节点的nova用户id一样：
保证两个节点的nova用户uid，gid相同，可使用id nova命令查看。
修改libvirt配置文件：
注意：两个节点都需要修改[root@compute-1 ~]# egrep -v '^$|^#' /etc/sysconfig/libvirtd
LIBVIRTD_CONFIG=/etc/libvirt/libvirtd.conf
LIBVIRTD_ARGS="--listen"
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[root@compute-2 ~]# egrep -v '^$|^#' /etc/sysconfig/libvirtd
LIBVIRTD_CONFIG=/etc/libvirt/libvirtd.conf
LIBVIRTD_ARGS="--listen"
[root@compute-1 ~]# grep -vE '^#|^$' /etc/libvirt/libvirtd.conf
listen_tls = 0
listen_tcp = 1
auth_tcp = "none"
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[root@compute-2 ~]# grep -vE '^#|^$' /etc/libvirt/libvirtd.conf
listen_tls = 0
listen_tcp = 1
auth_tcp = "none"
重启libvirtd服务：
[root@compute-1 ~]# systemctl restart libvirtd.service[root@compute-2 ~]# systemctl restart libvirtd.service
[root@compute-1 ~]# netstat -tunpl|grep 16509
tcp 0 0 0.0.0.0:16509 0.0.0.0:* LISTEN 21666/libvirtd
tcp6 0 0 :::16509 :::* LISTEN 21666/libvirtd
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[root@compute-2 ~]# netstat -tunpl|grep 16509
tcp 0 0 0.0.0.0:16509 0.0.0.0:* LISTEN 20576/libvirtd
tcp6 0 0 :::16509 :::* LISTEN 20576/libvirtd
测试下可否无密连接KVM：
[root@compute-1 ~]# virsh -c qemu+tcp://compute-2/systemWelcome to virsh, the virtualization interactive terminal.
Type: 'help' for help with commands
'quit' to quit
virsh # exit
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[root@compute-2 ~]# virsh -c qemu+tcp://compute-1/system
Welcome to virsh, the virtualization interactive terminal.
Type: 'help' for help with commands
'quit' to quit
virsh # exit
修改nova.conf配置文件：
注意：两个节点都需要修改[root@compute-1 ~]# vim /etc/nova/nova.conf
[libvirt]
virt_type = qemu
inject_key = True
live_migration_flag = VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,VIR_MIGRATE_LIVE
block_migration_flag = VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,VIR_MIGRATE_LIVE,VIR_MIGRATE_NON_SHARED_INC
live_migration_downtime = 500
live_migration_downtime_steps = 10
live_migration_downtime_delay = 75
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[root@compute-2 ~]# vim /etc/nova/nova.conf
[libvirt]
virt_type = qemu
inject_key = True
live_migration_flag = VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,VIR_MIGRATE_LIVE
block_migration_flag = VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,VIR_MIGRATE_LIVE,VIR_MIGRATE_NON_SHARED_INC
live_migration_downtime = 500
live_migration_downtime_steps = 10
live_migration_downtime_delay = 75
重启nova服务：
[root@compute-1 ~]# systemctl restart openstack-nova-compute.service[root@compute-2 ~]# systemctl restart openstack-nova-compute.service
开始实例热迁移：
不知为什么使用命令进行实例热迁移会没有效果，以下使用dashboard面板操作。
