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[tribaal, r=gnuoy] This branch introduces a new api-rate-limit-rules charm config option controlling the rate-limiting 
of the nova API by writing the passed value to the /etc/nova/api-paste.ini file.

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tests/basic_deployment.py
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    def _configure_services(self):
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        """Configure all of the services."""
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        nova_config = {'config-flags': 'auto_assign_floating_ip=False',
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                       'enable-live-migration': 'False'}
 
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                       'enable-live-migration': 'False',
 
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                       'api-rate-limit-rules':
 
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                            '( POST, *, .*, 9999, MINUTE );'}
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        nova_cc_config = {}
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        if self.git:
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            amulet_http_proxy = os.environ.get('AMULET_HTTP_PROXY')
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                message = "nova config error: {}".format(ret)
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                amulet.raise_status(amulet.FAIL, msg=message)
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    def test_api_paste_config(self):
 
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        """Check that the rate limiting is set on the nova api (for POSTs)."""
 
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        unit = self.nova_compute_sentry
 
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        conf = '/etc/nova/api-paste.ini'
 
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        section = "filter:ratelimit"
 
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        factory = ("nova.api.openstack.compute.limits:RateLimitingMiddleware"
 
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                   ".factory")
 
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        expected = {"paste.filter_factory": factory,
 
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                    "limits": "( POST, *, .*, 9999, MINUTE );"}
 
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        ret = u.validate_config_data(unit, conf, section, expected)
 
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        if ret:
 
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            message = "api paste config error: {}".format(ret)
 
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            amulet.raise_status(amulet.FAIL, msg=message)
 
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    def test_image_instance_create(self):
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        """Create an image/instance, verify they exist, and delete them."""
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        # NOTE(coreycb): Skipping failing test on essex until resolved. essex