[Bug 1298061] Re: nova should allow evacuate for an instance in the Error state

[Seyeong Kim]

I updated regression section, please review it
Thanks.

** Description changed:

  [Impact]
  
   * Instances in error state cannot be evacuated.
  
  [Test Case]
  
   * nova evacuate <error_state_instance> <another_compute_host>
   * nova refuses to evacuate the instance because of its state
  
  [Regression Potential]
  
-  * None
+  * Cherry picked from upstream
+    - removed unnecessary argument passing
+    - add allowing ERROR state before evacuating.
+  * actually, in code, added one parameter, and removed unused one.
+    so very low regression possibility.
+  * Tested on juju+maas test env.
   * Passed tempest smoke tests locally.
  
  Note: one simple way to put an instance into error state is to directly
  change its database record, for example "update instances set
  vm_state='error' where uuid='XXXXXXXX'"
- 
  
  We currently allow reboot/rebuild/rescue for an instance in the Error
  state if the instance has successfully booted at least once.
  
  We should allow "evacuate" as well, since it is essentially a "rebuild"
  on a different compute node.
  
  This would be useful in a number of cases, in particular if an initial
  evacuation attempt fails (putting the instance into the Error state).

** Changed in: nova (Ubuntu Trusty)
       Status: Incomplete => In Progress

** Changed in: nova (Ubuntu Trusty)
     Assignee: Liang Chen (cbjchen) => Seyeong Kim (xtrusia)

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https://bugs.launchpad.net/bugs/1298061

Title:
  nova should allow evacuate for an instance in the Error state

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive icehouse series:
  In Progress
Status in OpenStack Compute (nova):
  Fix Released
Status in nova package in Ubuntu:
  Fix Released
Status in nova source package in Trusty:
  In Progress

Bug description:
  [Impact]

   * Instances in error state cannot be evacuated.

  [Test Case]

   * nova evacuate <error_state_instance> <another_compute_host>
   * nova refuses to evacuate the instance because of its state

  [Regression Potential]

   * Cherry picked from upstream
     - removed unnecessary argument passing
     - add allowing ERROR state before evacuating.
   * actually, in code, added one parameter, and removed unused one.
     so very low regression possibility.
   * Tested on juju+maas test env.
   * Passed tempest smoke tests locally.

  Note: one simple way to put an instance into error state is to
  directly change its database record, for example "update instances set
  vm_state='error' where uuid='XXXXXXXX'"

  We currently allow reboot/rebuild/rescue for an instance in the Error
  state if the instance has successfully booted at least once.

  We should allow "evacuate" as well, since it is essentially a
  "rebuild" on a different compute node.

  This would be useful in a number of cases, in particular if an initial
  evacuation attempt fails (putting the instance into the Error state).

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