Arguably we shouldn't advertise the host-evacuate CLI, and we've talked
about deprecating it in the past since it can cause unpredictable
problems. See this blog post:

** Changed in: nova
       Status: New => Opinion

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  evacuate instance documentation not mentioning host-evacuate

Status in OpenStack Compute (nova):

Bug description:
  - [X] This is a doc addition request.

  The current documentation topic "evacuate" in the admin guide is not
  mentioning the host-evacuate command at all.

  if one wants to evacuate all instances on a failed host it is easier
  to use above command. As far as i understand the host-evacuate command
  will loop over the instances on the failed node and then run each
  instance against the scheduler so it can be recreated on a different
  compute node.

  i suggest to enhance the current documentation with a new section
  "auto schedule failover host" and move the current part into a section
  called "manually define failover host". or something like this.

  Release: on 2018-04-11 13:22
  SHA: 80fa0ff912e37890f255bbbcd1c25f26759070ff

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