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        "description": "Overview\n========\n\nAn extension hook for novaclient that enables it to interact with the Gridcentric endpoints.\n\nCommand line usage\n==================\n\nAfter installing the operations provided by the Gridcentric extension will be available to the \nnova command line application:\n\n    # Display all of the available commands of the nova script. The gridcentric bless, launch, \n    # list-blessed, list-launched, discard and gc-migrate are listed.\n    $ nova help\n    \n    # Doing nova help <command> on any of these commands will display how to use them in detail.\n    $ nova help bless\n    usage: nova bless <instance id>\n    \n    Bless an instance\n    \n    Positional arguments:\n      <instance id>  ID of the instance to bless\n    \n    $ nova help launch\n    usage: nova launch [--target <target memory>] [--params <key=value>]\n                       <blessed id>\n    \n    Launch a new instance\n    \n    Positional arguments:\n      <blessed id>          ID of the blessed instance\n    \n    Optional arguments:\n      --target <target memory>\n                            The memory target of the launched instance\n      --params <key=value>  Guest parameters to send to vms-agent\n    \n    $ nova help discard\n    usage: nova discard <blessed id>\n    \n    Discard a blessed instance\n    \n    Positional arguments:\n      <blessed id>  ID of the blessed instance\n    \n    $ nova help gc-migrate\n    usage: nova gc-migrate <instance id> <destination host>\n    \n    Migrate an instance using Gridcentric VMS\n    \n    Positional arguments:\n      <instance id>       ID of the instance to migrate\n      <destination host>  Host to migrate to\n    \n    $ nova help list-launched\n    usage: nova list-launched <blessed id>\n    \n    List instances launched from this blessed instance.\n    \n    Positional arguments:\n      <blessed id>  ID of the blessed instance\n    \n    $ nova help list-blessed\n    usage: nova list-blessed <server id>\n    \n    List instances blessed from this instance.\n    \n    Positional arguments:\n      <server id>  ID of the instance\n    \n\nScripting usage\n===============\n\nThe novaclient hooks can also be accessed directly using the python API.\n\n    user = \"admin\"\n    apikey = \"admin\"\n    project = \"openstackDemo\"\n    authurl = \"http://localhost:5000/v2.0\" \n    \n    extensions = shell.OpenStackComputeShell()._discover_extensions(\"1.1\")\n    novaclient = NovaClient(user, apikey, project, authurl, extensions=extensions,\n                            endpoint_type=shell.DEFAULT_NOVA_ENDPOINT_TYPE,\n                            service_type=shell.DEFAULT_NOVA_SERVICE_TYPE)\n    \n    def wait_for_status(server, status):\n        while server.status != status:\n            time.sleep(30)\n            server = novaclient.gridcentric.get(server.id)\n        return server\n\n    def wait_until_gone(server):\n        try:\n            while True:\n                server = novaclient.gridcentric.get(server.id)\n                time.sleep(10)\n        except Exception, e:\n            # server is no longer there.\n            pass\n\n    # Boot a new server using flavor 1 and the image passed in as the first arguement.\n    image_id = sys.argv[1]\n    flavor_id = 1\n    server = novaclient.servers.create(\"Gridcentric instance\",\n                                  image_id,\n                                  flavor_id)\n    server = wait_for_status(server, \"ACTIVE\")\n    \n    # Bless the server. This will return an instance of the blessed_server. We need to\n    # wait until the server becomes active.\n    blessed_server = novaclient.gridcentric.bless(server)[0]\n    blessed_server = wait_for_status(blessed_server, \"BLESSED\")\n    \n    # Launch a new server based off of the blessed one. Note that we can do this\n    # by either calling launch on the server itself, or passing the server into the\n    # gridcentric manager.\n    launched_server = blessed_server.launch()[0]\n    launched_server2 = novaclient.gridcentric.launch(blessed_server)[0]\n    \n    # list the servers that were launched from the blessed ones.\n    for s in blessed_server.list_launched():\n        print \"Server %s was launched from %s\" %(s.id, blessed_server.id)\n        \n    # Delete the launched servers.\n    launched_server2 = wait_for_status(launched_server2, \"ACTIVE\")\n    launched_server2.delete()\n    launched_server = wait_for_status(launched_server, \"ACTIVE\")\n    novaclient.servers.delete(launched_server)\n\n    # W need to ensure that the launched instances have been deleted before discarding\n    # the blessed instance.\n    wait_until_gone(launched_server2)\n    wait_until_gone(launched_server)\n\n    # Delete the original server. Note we can delete this server\n    # and keep the blessed one around.\n    server.delete()\n\n    # Discard the blessed server\n    blessed_server.discard()\n",
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