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[Sylvain Bauza <sbauza@xxxxxxx>]

That's definitly not a bug, rather a nit about the option.

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

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https://bugs.launchpad.net/bugs/1621379

Title:
  In the help msg of command host-evacuate，replace the optional
  arguments '--target_host' with '--target-host' more appropriate

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  In the help msg of command host-evacuate，replace the optional
  arguments '--target_host' with '--target-host' more appropriate

  [root@devstack162 devstack]# nova help host-evacuate 
  usage: nova host-evacuate [--target_host <target_host>] [--force] <host>

  Evacuate all instances from failed host.

  Positional arguments:
    <host>                       Name of host.

  Optional arguments:
    --target_host <target_host>  Name of target host. If no host is specified
                                 the scheduler will select a target.
    --force                      Force to not verify the scheduler if a host is
                                 provided. (Supported by API versions '2.29' -
                                 '2.latest')

  In the help information of other commands,never seen arguments with a
  '-' connection.People accustomed to the use of the '-'

  
  [root@devstack162 devstack]# nova host-evacuate tecsovs --target-host host1
  usage: nova [--version] [--debug] [--os-cache] [--timings]
              [--os-region-name <region-name>] [--service-type <service-type>]
              [--service-name <service-name>]
              [--os-endpoint-type <endpoint-type>]
              [--os-compute-api-version <compute-api-ver>]
              [--bypass-url <bypass-url>] [--insecure]
              [--os-cacert <ca-certificate>] [--os-cert <certificate>]
              [--os-key <key>] [--timeout <seconds>] [--os-auth-type <name>]
              [--os-auth-url OS_AUTH_URL] [--os-domain-id OS_DOMAIN_ID]
              [--os-domain-name OS_DOMAIN_NAME] [--os-project-id OS_PROJECT_ID]
              [--os-project-name OS_PROJECT_NAME]
              [--os-project-domain-id OS_PROJECT_DOMAIN_ID]
              [--os-project-domain-name OS_PROJECT_DOMAIN_NAME]
              [--os-trust-id OS_TRUST_ID]
              [--os-default-domain-id OS_DEFAULT_DOMAIN_ID]
              [--os-default-domain-name OS_DEFAULT_DOMAIN_NAME]
              [--os-user-id OS_USER_ID] [--os-username OS_USERNAME]
              [--os-user-domain-id OS_USER_DOMAIN_ID]
              [--os-user-domain-name OS_USER_DOMAIN_NAME]
              [--os-password OS_PASSWORD]
              <subcommand> ...
  error: unrecognized arguments: --target-host host1
  Try 'nova help ' for more information.
  [root@devstack162 devstack]#

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