[Bug 1196924] Re: Stop and Delete operations should give the Guest a chance to shutdown

[Liang Chen]

** Description changed:

+ This feature will cause an ACPI event to be sent to the system while
+ shutting down, and the acpid running inside the system can catch the
+ event, thus giving the system a chance to shutdown cleanly.
+ 
  [Impact]
  
-  * VMs being shutdown with any signal/notification from the The
+  * VMs being shutdown with any signal/notification from the The
  hypervisor level, services running inside VMs have no chance to perform
  a clean shutoff
  
  [Test Case]
  
-  * 1. stop a VM 
-    2. the VM is shutdown without any notification
+  * 1. stop a VM
+    2. the VM is shutdown without any notification
+ 
+ The can be easily seen by ssh into the system before shutting down. With
+ the patch in place, the ssh session will be close during shutdown,
+ because the sshd has the chance to close the connection before being
+ brought down. Without the patch, the ssh session will just hang there
+ for a while until timeout, because the connection is not promptly
+ closed.
+ 
+ 
+ To leverage the clean shutdown feature, one can create a file named /etc/acpi/events/power that contains the following:
+ 
+               event=button/power
+               action=/etc/acpi/power.sh "%e"
+ 
+ Then   create   a  file  named  /etc/acpi/power.sh  that  contains  whatever required to gracefully shutdown a particular server (VM).
+ With the apicd running, shutdown of the VM will cause  the rule in /etc/acpi/events/power to trigger the script in /etc/acpi/power.sh, thus cleanly shutdown the system.
+ 
  
  [Regression Potential]
  
-  * none
+  * none
  
  
- Currently in libvirt stop and delete operations simply destroy the
- underlying VM.     Some GuestOS's do not react well to this type of
- power failure, and it would be better if these operations followed the
- same approach a a soft_reboot and give the guest a chance to shutdown
- gracefully.   Even where VM is being deleted, it may be booted from a
- volume which will be reused on another server.
+ Currently in libvirt stop and delete operations simply destroy the underlying VM.     Some GuestOS's do not react well to this type of power failure, and it would be better if these operations followed the same approach a a soft_reboot and give the guest a chance to shutdown gracefully.   Even where VM is being deleted, it may be booted from a volume which will be reused on another server.

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https://bugs.launchpad.net/bugs/1196924

Title:
  Stop and Delete operations should give the Guest a chance to shutdown

Status in OpenStack Compute (nova):
  Fix Released
Status in nova package in Ubuntu:
  In Progress
Status in nova source package in Trusty:
  New

Bug description:
  This feature will cause an ACPI event to be sent to the system while
  shutting down, and the acpid running inside the system can catch the
  event, thus giving the system a chance to shutdown cleanly.

  [Impact]

   * VMs being shutdown with any signal/notification from the The
  hypervisor level, services running inside VMs have no chance to
  perform a clean shutoff

  [Test Case]

   * 1. stop a VM
     2. the VM is shutdown without any notification

  The can be easily seen by ssh into the system before shutting down.
  With the patch in place, the ssh session will be close during
  shutdown, because the sshd has the chance to close the connection
  before being brought down. Without the patch, the ssh session will
  just hang there for a while until timeout, because the connection is
  not promptly closed.

  
  To leverage the clean shutdown feature, one can create a file named /etc/acpi/events/power that contains the following:

                event=button/power
                action=/etc/acpi/power.sh "%e"

  Then   create   a  file  named  /etc/acpi/power.sh  that  contains  whatever required to gracefully shutdown a particular server (VM).
  With the apicd running, shutdown of the VM will cause  the rule in /etc/acpi/events/power to trigger the script in /etc/acpi/power.sh, thus cleanly shutdown the system.

  
  [Regression Potential]

   * none

  
  Currently in libvirt stop and delete operations simply destroy the underlying VM.     Some GuestOS's do not react well to this type of power failure, and it would be better if these operations followed the same approach a a soft_reboot and give the guest a chance to shutdown gracefully.   Even where VM is being deleted, it may be booted from a volume which will be reused on another server.

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