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A.3. 使用 hook 对 VDSM 进行扩展
本章介绍了通过使用事件驱动的 hook 来对 VDSM 进行扩展。它在现阶段还是一个试验性质的技术，因此这里所介绍的内容主要针对于有经验的程序员。请注意，现阶段 hook 还无法在 Red Hat Enterprise Virtualization Hypervisor 上运行，它们只能在 Red Hat Enterprise Linux 主机上运行。另外，通过设置虚拟机的自定义属性（custom properties）可以把只针对于特定虚拟机的额外参数传递到 hook 脚本。
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