红帽全球峰会12.4.2.3. 加密的实时迁移
如果有足够的要求（如升级）使实时迁移保持启用，那么 libvirtd 可以为实时迁移提供加密的隧道。但是，这个功能不会在 OpenStack Dashboard 或 nova-client 命令中公开，只能通过 libvirtd 的手动配置来访问。然后，实时迁移过程会更改为以下高级别步骤：
- 实例数据从虚拟机监控程序复制到 libvirtd。
- 在源和目标主机上的 libvirtd 进程之间创建一个加密的隧道。
- 目标 libvirtd 主机将实例重新复制到底层虚拟机监控程序。
注意
对于 Red Hat OpenStack Platform 13，建议的方法是使用隧道迁移，这在将 Ceph 用作后端时默认启用。如需更多信息，请参阅 https://docs.openstack.org/nova/queens/configuration/config.html#libvirt.live_migration_tunnelled。
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