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nponeccop
Asked: 2016-01-07 16:22:02 +0800 CST

Linux guest graceful shutdown in Hyper-V

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What mechanism Hyper-V use to signal a Linux guest to gracefully shut down?

Somehow CoreOS does gracefully shut down, but another Linux doesn't (it is just abruptly powered off)

hyper-v

3 Answers

  1. Best Answer

    I figured it out. drivers/hv/hv_util.c calls orderly_poweroff() from kernel/reboot.c which subsequently fails to find /sbin/poweroff and does only a minimal cleanup.

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  2. If i am not mistaken, Hyper v integration is what causes this. I have not used CoreOS but usually this is what causes your virtual server to shutdown correctly.

    In terminal, issue the command lsmod. On CoreOS you will (if i am right) see that it lists Hyperv services(hv_vmbus, hv_netvsc, etc) on the other it does not. Some Linux distros come with it built in and others you can add it. If this is not it, comment below and i will delete this answer.

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  3. This does not answer your question as detailed, as you might want to know. I want to add this as an answer nonetheless, as the detailed technical answers comes close to be off-topic (non-supported environment).

    You want to look at the documentation of Linux and FreeBSD Virtual Machines on Hyper-V on what distributions are supported. Check the section of the individual distribution and version and see, if the Core is supported.

    Core
    Integrated shutdown:
    With this feature, an administrator can shut down virtual machines from the Hyper-V Manager. For more information, see Operating system shutdown.
    Source: Feature Descriptions for Linux and FreeBSD virtual machines on Hyper-V

    If the distribution is not supported, it is not advised to use them in production. Even if there are ways to implement support on a non-listed distribution.

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