Merge pull request #173 from hltbra/multi-region

Add multi-region support to EC2 Instances, Autoscaling Groups & LaunchConfigurations

moto/autoscaling/__init__.py

@@ -1,2 +1,9 @@
-from .models import autoscaling_backend
+from .models import autoscaling_backend, autoscaling_backends
-mock_autoscaling = autoscaling_backend.decorator
+from ..core.models import MockAWS
+
+
+def mock_autoscaling(func=None):
+    if func:
+        return MockAWS(autoscaling_backends)(func)
+    else:
+        return MockAWS(autoscaling_backends)

moto/autoscaling/models.py

@@ -1,6 +1,6 @@
 from boto.ec2.blockdevicemapping import BlockDeviceType, BlockDeviceMapping
 from moto.core import BaseBackend
-from moto.ec2 import ec2_backend
+from moto.ec2 import ec2_backends
 
 # http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/AS_Concepts.html#Cooldown
 DEFAULT_COOLDOWN = 300
@@ -8,7 +8,7 @@ DEFAULT_COOLDOWN = 300
 
 class FakeScalingPolicy(object):
     def __init__(self, name, adjustment_type, as_name, scaling_adjustment,
-                 cooldown):
+                 cooldown, autoscaling_backend):
         self.name = name
         self.adjustment_type = adjustment_type
         self.as_name = as_name
@@ -17,14 +17,15 @@ class FakeScalingPolicy(object):
             self.cooldown = cooldown
         else:
             self.cooldown = DEFAULT_COOLDOWN
+        self.autoscaling_backend = autoscaling_backend
 
     def execute(self):
         if self.adjustment_type == 'ExactCapacity':
-            autoscaling_backend.set_desired_capacity(self.as_name, self.scaling_adjustment)
+            self.autoscaling_backend.set_desired_capacity(self.as_name, self.scaling_adjustment)
         elif self.adjustment_type == 'ChangeInCapacity':
-            autoscaling_backend.change_capacity(self.as_name, self.scaling_adjustment)
+            self.autoscaling_backend.change_capacity(self.as_name, self.scaling_adjustment)
         elif self.adjustment_type == 'PercentChangeInCapacity':
-            autoscaling_backend.change_capacity_percent(self.as_name, self.scaling_adjustment)
+            self.autoscaling_backend.change_capacity_percent(self.as_name, self.scaling_adjustment)
 
 
 class FakeLaunchConfiguration(object):
@@ -104,7 +105,7 @@ class FakeAutoScalingGroup(object):
     def __init__(self, name, availability_zones, desired_capacity, max_size,
                  min_size, launch_config_name, vpc_zone_identifier,
                  default_cooldown, health_check_period, health_check_type,
-                 load_balancers, placement_group, termination_policies):
+                 load_balancers, placement_group, termination_policies, autoscaling_backend):
         self.name = name
         self.availability_zones = availability_zones
         self.max_size = max_size
@@ -124,6 +125,8 @@ class FakeAutoScalingGroup(object):
         self.instances = []
         self.set_desired_capacity(desired_capacity)
 
+        self.autoscaling_backend = autoscaling_backend
+
     @classmethod
     def create_from_cloudformation_json(cls, resource_name, cloudformation_json):
         properties = cloudformation_json['Properties']
@@ -182,7 +185,7 @@ class FakeAutoScalingGroup(object):
         if self.desired_capacity > curr_instance_count:
             # Need more instances
             count_needed = self.desired_capacity - curr_instance_count
-            reservation = ec2_backend.add_instances(
+            reservation = autoscaling_backend.ec2_backend.add_instances(
                 self.launch_config.image_id,
                 count_needed,
                 self.launch_config.user_data,
@@ -196,16 +199,22 @@ class FakeAutoScalingGroup(object):
             count_to_remove = curr_instance_count - self.desired_capacity
             instances_to_remove = self.instances[:count_to_remove]
             instance_ids_to_remove = [instance.id for instance in instances_to_remove]
-            ec2_backend.terminate_instances(instance_ids_to_remove)
+            autoscaling_backend.ec2_backend.terminate_instances(instance_ids_to_remove)
             self.instances = self.instances[count_to_remove:]
 
 
 class AutoScalingBackend(BaseBackend):
 
-    def __init__(self):
+    def __init__(self, ec2_backend):
         self.autoscaling_groups = {}
         self.launch_configurations = {}
         self.policies = {}
+        self.ec2_backend = ec2_backend
+
+    def reset(self):
+        ec2_backend = self.ec2_backend
+        self.__dict__ = {}
+        self.__init__(ec2_backend)
 
     def create_launch_configuration(self, name, image_id, key_name,
                                     security_groups, user_data, instance_type,
@@ -267,6 +276,7 @@ class AutoScalingBackend(BaseBackend):
             load_balancers=load_balancers,
             placement_group=placement_group,
             termination_policies=termination_policies,
+            autoscaling_backend=self,
         )
         self.autoscaling_groups[name] = group
         return group
@@ -328,7 +338,7 @@ class AutoScalingBackend(BaseBackend):
     def create_autoscaling_policy(self, name, adjustment_type, as_name,
                                   scaling_adjustment, cooldown):
         policy = FakeScalingPolicy(name, adjustment_type, as_name,
-                                   scaling_adjustment, cooldown)
+                                   scaling_adjustment, cooldown, self)
 
         self.policies[name] = policy
         return policy
@@ -343,4 +353,9 @@ class AutoScalingBackend(BaseBackend):
         policy = self.policies[group_name]
         policy.execute()
 
-autoscaling_backend = AutoScalingBackend()
+
+autoscaling_backends = {}
+for region, ec2_backend in ec2_backends.items():
+    autoscaling_backends[region] = AutoScalingBackend(ec2_backend)
+
+autoscaling_backend = autoscaling_backends['us-east-1']

moto/autoscaling/responses.py

@@ -2,10 +2,15 @@ from jinja2 import Template
 
 from moto.core.responses import BaseResponse
 from moto.core.utils import camelcase_to_underscores
-from .models import autoscaling_backend
+from .models import autoscaling_backends
 
 
 class AutoScalingResponse(BaseResponse):
+
+    @property
+    def autoscaling_backend(self):
+      return autoscaling_backends[self.region]
+
     def _get_int_param(self, param_name):
         value = self._get_param(param_name)
         if value is not None:
@@ -32,7 +37,7 @@ class AutoScalingResponse(BaseResponse):
             instance_monitoring = True
         else:
             instance_monitoring = False
-        autoscaling_backend.create_launch_configuration(
+        self.autoscaling_backend.create_launch_configuration(
             name=self._get_param('LaunchConfigurationName'),
             image_id=self._get_param('ImageId'),
             key_name=self._get_param('KeyName'),
@@ -51,18 +56,18 @@ class AutoScalingResponse(BaseResponse):
 
     def describe_launch_configurations(self):
         names = self._get_multi_param('LaunchConfigurationNames')
-        launch_configurations = autoscaling_backend.describe_launch_configurations(names)
+        launch_configurations = self.autoscaling_backend.describe_launch_configurations(names)
         template = Template(DESCRIBE_LAUNCH_CONFIGURATIONS_TEMPLATE)
         return template.render(launch_configurations=launch_configurations)
 
     def delete_launch_configuration(self):
         launch_configurations_name = self.querystring.get('LaunchConfigurationName')[0]
-        autoscaling_backend.delete_launch_configuration(launch_configurations_name)
+        self.autoscaling_backend.delete_launch_configuration(launch_configurations_name)
         template = Template(DELETE_LAUNCH_CONFIGURATION_TEMPLATE)
         return template.render()
 
     def create_auto_scaling_group(self):
-        autoscaling_backend.create_autoscaling_group(
+        self.autoscaling_backend.create_autoscaling_group(
             name=self._get_param('AutoScalingGroupName'),
             availability_zones=self._get_multi_param('AvailabilityZones.member'),
             desired_capacity=self._get_int_param('DesiredCapacity'),
@@ -82,12 +87,12 @@ class AutoScalingResponse(BaseResponse):
 
     def describe_auto_scaling_groups(self):
         names = self._get_multi_param("AutoScalingGroupNames")
-        groups = autoscaling_backend.describe_autoscaling_groups(names)
+        groups = self.autoscaling_backend.describe_autoscaling_groups(names)
         template = Template(DESCRIBE_AUTOSCALING_GROUPS_TEMPLATE)
         return template.render(groups=groups)
 
     def update_auto_scaling_group(self):
-        autoscaling_backend.update_autoscaling_group(
+        self.autoscaling_backend.update_autoscaling_group(
             name=self._get_param('AutoScalingGroupName'),
             availability_zones=self._get_multi_param('AvailabilityZones.member'),
             desired_capacity=self._get_int_param('DesiredCapacity'),
@@ -107,24 +112,24 @@ class AutoScalingResponse(BaseResponse):
 
     def delete_auto_scaling_group(self):
         group_name = self._get_param('AutoScalingGroupName')
-        autoscaling_backend.delete_autoscaling_group(group_name)
+        self.autoscaling_backend.delete_autoscaling_group(group_name)
         template = Template(DELETE_AUTOSCALING_GROUP_TEMPLATE)
         return template.render()
 
     def set_desired_capacity(self):
         group_name = self._get_param('AutoScalingGroupName')
         desired_capacity = self._get_int_param('DesiredCapacity')
-        autoscaling_backend.set_desired_capacity(group_name, desired_capacity)
+        self.autoscaling_backend.set_desired_capacity(group_name, desired_capacity)
         template = Template(SET_DESIRED_CAPACITY_TEMPLATE)
         return template.render()
 
     def describe_auto_scaling_instances(self):
-        instances = autoscaling_backend.describe_autoscaling_instances()
+        instances = self.autoscaling_backend.describe_autoscaling_instances()
         template = Template(DESCRIBE_AUTOSCALING_INSTANCES_TEMPLATE)
         return template.render(instances=instances)
 
     def put_scaling_policy(self):
-        policy = autoscaling_backend.create_autoscaling_policy(
+        policy = self.autoscaling_backend.create_autoscaling_policy(
             name=self._get_param('PolicyName'),
             adjustment_type=self._get_param('AdjustmentType'),
             as_name=self._get_param('AutoScalingGroupName'),
@@ -135,19 +140,19 @@ class AutoScalingResponse(BaseResponse):
         return template.render(policy=policy)
 
     def describe_policies(self):
-        policies = autoscaling_backend.describe_policies()
+        policies = self.autoscaling_backend.describe_policies()
         template = Template(DESCRIBE_SCALING_POLICIES_TEMPLATE)
         return template.render(policies=policies)
 
     def delete_policy(self):
         group_name = self._get_param('PolicyName')
-        autoscaling_backend.delete_policy(group_name)
+        self.autoscaling_backend.delete_policy(group_name)
         template = Template(DELETE_POLICY_TEMPLATE)
         return template.render()
 
     def execute_policy(self):
         group_name = self._get_param('PolicyName')
-        autoscaling_backend.execute_policy(group_name)
+        self.autoscaling_backend.execute_policy(group_name)
         template = Template(EXECUTE_POLICY_TEMPLATE)
         return template.render()
 

moto/core/models.py

@@ -9,8 +9,8 @@ from .utils import convert_regex_to_flask_path
 class MockAWS(object):
     nested_count = 0
 
-    def __init__(self, backend):
+    def __init__(self, backends):
-        self.backend = backend
+        self.backends = backends
 
         if self.__class__.nested_count == 0:
             HTTPretty.reset()
@@ -26,13 +26,15 @@ class MockAWS(object):
 
     def start(self):
         self.__class__.nested_count += 1
-        self.backend.reset()
+        for backend in self.backends.values():
+            backend.reset()
 
         if not HTTPretty.is_enabled():
             HTTPretty.enable()
 
         for method in HTTPretty.METHODS:
-            for key, value in self.backend.urls.iteritems():
+            backend = self.backends.values()[0]
+            for key, value in backend.urls.iteritems():
                 HTTPretty.register_uri(
                     method=method,
                     uri=re.compile(key),
@@ -151,6 +153,6 @@ class BaseBackend(object):
 
     def decorator(self, func=None):
         if func:
-            return MockAWS(self)(func)
+            return MockAWS({'global': self})(func)
         else:
-            return MockAWS(self)
+            return MockAWS({'global': self})

moto/core/responses.py

@@ -1,5 +1,6 @@
 import datetime
 import json
+import re
 
 from urlparse import parse_qs, urlparse
 
@@ -9,6 +10,8 @@ from moto.core.utils import camelcase_to_underscores, method_names_from_class
 
 class BaseResponse(object):
 
+    region = 'us-east-1'
+
     def dispatch(self, request, full_url, headers):
         querystring = {}
 
@@ -38,6 +41,9 @@ class BaseResponse(object):
         self.path = urlparse(full_url).path
         self.querystring = querystring
         self.method = request.method
+        region = re.search(r'\.(.+?)\.amazonaws\.com', full_url)
+        if region:
+            self.region = region.group(1)
 
         self.headers = dict(request.headers)
         self.response_headers = headers

moto/ec2/__init__.py

@@ -1,2 +1,8 @@
-from .models import ec2_backend
+from .models import ec2_backends, ec2_backend
-mock_ec2 = ec2_backend.decorator
+from ..core.models import MockAWS
+
+def mock_ec2(func=None):
+    if func:
+        return MockAWS(ec2_backends)(func)
+    else:
+        return MockAWS(ec2_backends)

moto/ec2/models.py

@@ -2,6 +2,7 @@ import copy
 import itertools
 from collections import defaultdict
 
+import boto
 from boto.ec2.instance import Instance as BotoInstance, Reservation
 from boto.ec2.blockdevicemapping import BlockDeviceMapping, BlockDeviceType
 from boto.ec2.spotinstancerequest import SpotInstanceRequest as BotoSpotRequest
@@ -1360,4 +1361,8 @@ class EC2Backend(BaseBackend, InstanceBackend, TagBackend, AmiBackend,
         raise EC2ClientError(code, message)
 
 
-ec2_backend = EC2Backend()
+ec2_backends = {}
+for region in boto.ec2.regions():
+    ec2_backends[region.name] = EC2Backend()
+
+ec2_backend = ec2_backends['us-east-1']

moto/ec2/responses/__init__.py

@@ -60,4 +60,7 @@ class EC2Response(
     VPNConnections,
     Windows,
 ):
-    pass
+    @property
+    def ec2_backend(self):
+        from moto.ec2.models import ec2_backends
+        return ec2_backends[self.region]

moto/ec2/responses/instances.py

@@ -2,7 +2,6 @@ from jinja2 import Template
 
 from moto.core.responses import BaseResponse
 from moto.core.utils import camelcase_to_underscores
-from moto.ec2.models import ec2_backend
 from moto.ec2.utils import instance_ids_from_querystring, filters_from_querystring, filter_reservations
 
 
@@ -10,9 +9,9 @@ class InstanceResponse(BaseResponse):
     def describe_instances(self):
         instance_ids = instance_ids_from_querystring(self.querystring)
         if instance_ids:
-            reservations = ec2_backend.get_reservations_by_instance_ids(instance_ids)
+            reservations = self.ec2_backend.get_reservations_by_instance_ids(instance_ids)
         else:
-            reservations = ec2_backend.all_reservations(make_copy=True)
+            reservations = self.ec2_backend.all_reservations(make_copy=True)
 
         filter_dict = filters_from_querystring(self.querystring)
         reservations = filter_reservations(reservations, filter_dict)
@@ -29,7 +28,7 @@ class InstanceResponse(BaseResponse):
         instance_type = self.querystring.get("InstanceType", ["m1.small"])[0]
         subnet_id = self.querystring.get("SubnetId", [None])[0]
         key_name = self.querystring.get("KeyName", [None])[0]
-        new_reservation = ec2_backend.add_instances(
+        new_reservation = self.ec2_backend.add_instances(
             image_id, min_count, user_data, security_group_names,
             instance_type=instance_type, subnet_id=subnet_id,
             key_name=key_name, security_group_ids=security_group_ids)
@@ -38,25 +37,25 @@ class InstanceResponse(BaseResponse):
 
     def terminate_instances(self):
         instance_ids = instance_ids_from_querystring(self.querystring)
-        instances = ec2_backend.terminate_instances(instance_ids)
+        instances = self.ec2_backend.terminate_instances(instance_ids)
         template = Template(EC2_TERMINATE_INSTANCES)
         return template.render(instances=instances)
 
     def reboot_instances(self):
         instance_ids = instance_ids_from_querystring(self.querystring)
-        instances = ec2_backend.reboot_instances(instance_ids)
+        instances = self.ec2_backend.reboot_instances(instance_ids)
         template = Template(EC2_REBOOT_INSTANCES)
         return template.render(instances=instances)
 
     def stop_instances(self):
         instance_ids = instance_ids_from_querystring(self.querystring)
-        instances = ec2_backend.stop_instances(instance_ids)
+        instances = self.ec2_backend.stop_instances(instance_ids)
         template = Template(EC2_STOP_INSTANCES)
         return template.render(instances=instances)
 
     def start_instances(self):
         instance_ids = instance_ids_from_querystring(self.querystring)
-        instances = ec2_backend.start_instances(instance_ids)
+        instances = self.ec2_backend.start_instances(instance_ids)
         template = Template(EC2_START_INSTANCES)
         return template.render(instances=instances)
 
@@ -64,9 +63,9 @@ class InstanceResponse(BaseResponse):
         instance_ids = instance_ids_from_querystring(self.querystring)
 
         if instance_ids:
-            instances = ec2_backend.get_multi_instances_by_id(instance_ids)
+            instances = self.ec2_backend.get_multi_instances_by_id(instance_ids)
         else:
-            instances = ec2_backend.all_instances()
+            instances = self.ec2_backend.all_instances()
 
         template = Template(EC2_INSTANCE_STATUS)
         return template.render(instances=instances)
@@ -78,7 +77,7 @@ class InstanceResponse(BaseResponse):
         key = camelcase_to_underscores(attribute)
         instance_ids = instance_ids_from_querystring(self.querystring)
         instance_id = instance_ids[0]
-        instance, value = ec2_backend.describe_instance_attribute(instance_id, key)
+        instance, value = self.ec2_backend.describe_instance_attribute(instance_id, key)
         template = Template(EC2_DESCRIBE_INSTANCE_ATTRIBUTE)
         return template.render(instance=instance, attribute=attribute, value=value)
 
@@ -126,7 +125,7 @@ class InstanceResponse(BaseResponse):
 
             instance_ids = instance_ids_from_querystring(self.querystring)
             instance_id = instance_ids[0]
-            instance = ec2_backend.get_instance(instance_id)
+            instance = self.ec2_backend.get_instance(instance_id)
 
             block_device_type = instance.block_device_mapping[device_name_value]
             block_device_type.delete_on_termination = del_on_term_value
@@ -151,7 +150,7 @@ class InstanceResponse(BaseResponse):
         normalized_attribute = camelcase_to_underscores(attribute_key.split(".")[0])
         instance_ids = instance_ids_from_querystring(self.querystring)
         instance_id = instance_ids[0]
-        ec2_backend.modify_instance_attribute(instance_id, normalized_attribute, value)
+        self.ec2_backend.modify_instance_attribute(instance_id, normalized_attribute, value)
         return EC2_MODIFY_INSTANCE_ATTRIBUTE
 
 

tests/test_ec2/test_regions.py

@@ -0,0 +1,132 @@
+import boto.ec2
+import boto.ec2.autoscale
+import sure
+from moto import mock_ec2, mock_autoscaling
+
+
+def add_servers_to_region(ami_id, count, region):
+    conn = boto.ec2.connect_to_region(region)
+    for index in range(count):
+        conn.run_instances(ami_id)
+
+
+@mock_ec2
+def test_add_servers_to_a_single_region():
+    region = 'ap-northeast-1'
+    add_servers_to_region('ami-1234abcd', 1, region)
+    add_servers_to_region('ami-5678efgh', 1, region)
+
+    conn = boto.ec2.connect_to_region(region)
+    reservations = conn.get_all_instances()
+    len(reservations).should.equal(2)
+    reservations.sort(key=lambda x: x.instances[0].image_id)
+    
+    reservations[0].instances[0].image_id.should.equal('ami-1234abcd')
+    reservations[1].instances[0].image_id.should.equal('ami-5678efgh')
+
+
+@mock_ec2
+def test_add_servers_to_multiple_regions():
+    region1 = 'us-east-1'
+    region2 = 'ap-northeast-1'
+    add_servers_to_region('ami-1234abcd', 1, region1)
+    add_servers_to_region('ami-5678efgh', 1, region2)
+
+    us_conn = boto.ec2.connect_to_region(region1)
+    ap_conn = boto.ec2.connect_to_region(region2)
+    us_reservations = us_conn.get_all_instances()
+    ap_reservations = ap_conn.get_all_instances()
+
+    len(us_reservations).should.equal(1)
+    len(ap_reservations).should.equal(1)
+    
+    us_reservations[0].instances[0].image_id.should.equal('ami-1234abcd')
+    ap_reservations[0].instances[0].image_id.should.equal('ami-5678efgh')
+
+
+@mock_autoscaling
+def test_create_autoscaling_group():
+    us_conn = boto.ec2.autoscale.connect_to_region('us-east-1')
+    config = boto.ec2.autoscale.LaunchConfiguration(
+        name='us_tester',
+        image_id='ami-abcd1234',
+        instance_type='m1.small',
+    )
+    us_conn.create_launch_configuration(config)
+
+    group = boto.ec2.autoscale.AutoScalingGroup(
+        name='us_tester_group',
+        availability_zones=['us-east-1c'],
+        default_cooldown=60,
+        desired_capacity=2,
+        health_check_period=100,
+        health_check_type="EC2",
+        max_size=2,
+        min_size=2,
+        launch_config=config,
+        load_balancers=["us_test_lb"],
+        placement_group="us_test_placement",
+        vpc_zone_identifier='subnet-1234abcd',
+        termination_policies=["OldestInstance", "NewestInstance"],
+    )
+    us_conn.create_auto_scaling_group(group)
+
+
+    ap_conn = boto.ec2.autoscale.connect_to_region('ap-northeast-1')
+    config = boto.ec2.autoscale.LaunchConfiguration(
+        name='ap_tester',
+        image_id='ami-efgh5678',
+        instance_type='m1.small',
+    )
+    ap_conn.create_launch_configuration(config)
+
+    group = boto.ec2.autoscale.AutoScalingGroup(
+        name='ap_tester_group',
+        availability_zones=['ap-northeast-1a'],
+        default_cooldown=60,
+        desired_capacity=2,
+        health_check_period=100,
+        health_check_type="EC2",
+        max_size=2,
+        min_size=2,
+        launch_config=config,
+        load_balancers=["ap_test_lb"],
+        placement_group="ap_test_placement",
+        vpc_zone_identifier='subnet-5678efgh',
+        termination_policies=["OldestInstance", "NewestInstance"],
+    )
+    ap_conn.create_auto_scaling_group(group)
+
+
+    len(us_conn.get_all_groups()).should.equal(1)
+    len(ap_conn.get_all_groups()).should.equal(1)
+
+    us_group = us_conn.get_all_groups()[0]
+    us_group.name.should.equal('us_tester_group')
+    list(us_group.availability_zones).should.equal(['us-east-1c'])
+    us_group.desired_capacity.should.equal(2)
+    us_group.max_size.should.equal(2)
+    us_group.min_size.should.equal(2)
+    us_group.vpc_zone_identifier.should.equal('subnet-1234abcd')
+    us_group.launch_config_name.should.equal('us_tester')
+    us_group.default_cooldown.should.equal(60)
+    us_group.health_check_period.should.equal(100)
+    us_group.health_check_type.should.equal("EC2")
+    list(us_group.load_balancers).should.equal(["us_test_lb"])
+    us_group.placement_group.should.equal("us_test_placement")
+    list(us_group.termination_policies).should.equal(["OldestInstance", "NewestInstance"])
+
+    ap_group = ap_conn.get_all_groups()[0]
+    ap_group.name.should.equal('ap_tester_group')
+    list(ap_group.availability_zones).should.equal(['ap-northeast-1a'])
+    ap_group.desired_capacity.should.equal(2)
+    ap_group.max_size.should.equal(2)
+    ap_group.min_size.should.equal(2)
+    ap_group.vpc_zone_identifier.should.equal('subnet-5678efgh')
+    ap_group.launch_config_name.should.equal('ap_tester')
+    ap_group.default_cooldown.should.equal(60)
+    ap_group.health_check_period.should.equal(100)
+    ap_group.health_check_type.should.equal("EC2")
+    list(ap_group.load_balancers).should.equal(["ap_test_lb"])
+    ap_group.placement_group.should.equal("ap_test_placement")
+    list(ap_group.termination_policies).should.equal(["OldestInstance", "NewestInstance"])

tests/test_ec2/test_server.py

@@ -12,7 +12,10 @@ def test_ec2_server_get():
     backend = server.create_backend_app("ec2")
     test_client = backend.test_client()
 
-    res = test_client.get('/?Action=RunInstances&ImageId=ami-60a54009')
+    res = test_client.get(
+        '/?Action=RunInstances&ImageId=ami-60a54009',
+        headers={"Host": "ec2.us-east-1.amazonaws.com"}
+    )
 
     groups = re.search("<instanceId>(.*)</instanceId>", res.data)
     instance_id = groups.groups()[0]