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Re: How exactly does CloudStack stop a VM?

On KVM,  AFAIK the shutdown is the equivalent of pressing the power
button.  To get the Linux OS to catch this and initiate a clean shutdown,
you need the ACPID service running in the guest OS.

On Wed, Jun 6, 2018 at 6:01 PM, Yiping Zhang <yzhang@xxxxxxxxxxx> wrote:

> Hi, all:
> We have a few VM instances which will hang when issue a Stop command from
> CloudStack web UI or thru API calls, due to the app’s own startup/stop
> script in guest OS was not properly invoked.  The app’s startup/stop script
> works properly if we issue shutdown/reboot command in guest OS directly.
> Hence here is my question:  when CloudStack tries to stop a running VM
> instance, what is the exact command it sends to VM to stop it, with or
> without forced flag?  What are the interactions between the CloudStack, the
> hypervisor and the guest VM?
> Yiping