Add support for Launch Templates in Auto Scaling Groups (#3236)

* Add support for Launch Templates in Auto Scaling Groups

* Use named parameters, simplify parameter validation

IMPLEMENTATION_COVERAGE.md

@@ -2639,7 +2639,7 @@
 - [X] create_internet_gateway
 - [X] create_key_pair
 - [X] create_launch_template
-- [ ] create_launch_template_version
+- [x] create_launch_template_version
 - [ ] create_local_gateway_route
 - [ ] create_local_gateway_route_table_vpc_association
 - [X] create_nat_gateway

moto/autoscaling/exceptions.py

@@ -21,3 +21,8 @@ class InvalidInstanceError(AutoscalingClientError):
         super(InvalidInstanceError, self).__init__(
             "ValidationError", "Instance [{0}] is invalid.".format(instance_id)
         )
+
+
+class ValidationError(AutoscalingClientError):
+    def __init__(self, message):
+        super(ValidationError, self).__init__("ValidationError", message)

moto/autoscaling/models.py

@@ -7,6 +7,7 @@ from moto.ec2.exceptions import InvalidInstanceIdError
 
 from moto.compat import OrderedDict
 from moto.core import BaseBackend, BaseModel, CloudFormationModel
+from moto.core.utils import camelcase_to_underscores
 from moto.ec2 import ec2_backends
 from moto.elb import elb_backends
 from moto.elbv2 import elbv2_backends
@@ -15,6 +16,7 @@ from .exceptions import (
     AutoscalingClientError,
     ResourceContentionError,
     InvalidInstanceError,
+    ValidationError,
 )
 
 # http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/AS_Concepts.html#Cooldown
@@ -233,6 +235,7 @@ class FakeAutoScalingGroup(CloudFormationModel):
         max_size,
         min_size,
         launch_config_name,
+        launch_template,
         vpc_zone_identifier,
         default_cooldown,
         health_check_period,
@@ -242,10 +245,12 @@ class FakeAutoScalingGroup(CloudFormationModel):
         placement_group,
         termination_policies,
         autoscaling_backend,
+        ec2_backend,
         tags,
         new_instances_protected_from_scale_in=False,
     ):
         self.autoscaling_backend = autoscaling_backend
+        self.ec2_backend = ec2_backend
         self.name = name
 
         self._set_azs_and_vpcs(availability_zones, vpc_zone_identifier)
@@ -253,10 +258,10 @@ class FakeAutoScalingGroup(CloudFormationModel):
         self.max_size = max_size
         self.min_size = min_size
 
-        self.launch_config = self.autoscaling_backend.launch_configurations[
+        self.launch_template = None
-            launch_config_name
+        self.launch_config = None
-        ]
+
-        self.launch_config_name = launch_config_name
+        self._set_launch_configuration(launch_config_name, launch_template)
 
         self.default_cooldown = (
             default_cooldown if default_cooldown else DEFAULT_COOLDOWN
@@ -310,6 +315,34 @@ class FakeAutoScalingGroup(CloudFormationModel):
         self.availability_zones = availability_zones
         self.vpc_zone_identifier = vpc_zone_identifier
 
+    def _set_launch_configuration(self, launch_config_name, launch_template):
+        if launch_config_name:
+            self.launch_config = self.autoscaling_backend.launch_configurations[
+                launch_config_name
+            ]
+            self.launch_config_name = launch_config_name
+
+        if launch_template:
+            launch_template_id = launch_template.get("launch_template_id")
+            launch_template_name = launch_template.get("launch_template_name")
+
+            if not (launch_template_id or launch_template_name) or (
+                launch_template_id and launch_template_name
+            ):
+                raise ValidationError(
+                    "Valid requests must contain either launchTemplateId or LaunchTemplateName"
+                )
+
+            if launch_template_id:
+                self.launch_template = self.ec2_backend.get_launch_template(
+                    launch_template_id
+                )
+            elif launch_template_name:
+                self.launch_template = self.ec2_backend.get_launch_template_by_name(
+                    launch_template_name
+                )
+            self.launch_template_version = int(launch_template["version"])
+
     @staticmethod
     def __set_string_propagate_at_launch_booleans_on_tags(tags):
         bool_to_string = {True: "true", False: "false"}
@@ -334,6 +367,10 @@ class FakeAutoScalingGroup(CloudFormationModel):
         properties = cloudformation_json["Properties"]
 
         launch_config_name = properties.get("LaunchConfigurationName")
+        launch_template = {
+            camelcase_to_underscores(k): v
+            for k, v in properties.get("LaunchTemplate", {}).items()
+        }
         load_balancer_names = properties.get("LoadBalancerNames", [])
         target_group_arns = properties.get("TargetGroupARNs", [])
 
@@ -345,6 +382,7 @@ class FakeAutoScalingGroup(CloudFormationModel):
             max_size=properties.get("MaxSize"),
             min_size=properties.get("MinSize"),
             launch_config_name=launch_config_name,
+            launch_template=launch_template,
             vpc_zone_identifier=(
                 ",".join(properties.get("VPCZoneIdentifier", [])) or None
             ),
@@ -393,6 +431,38 @@ class FakeAutoScalingGroup(CloudFormationModel):
     def physical_resource_id(self):
         return self.name
 
+    @property
+    def image_id(self):
+        if self.launch_template:
+            version = self.launch_template.get_version(self.launch_template_version)
+            return version.image_id
+
+        return self.launch_config.image_id
+
+    @property
+    def instance_type(self):
+        if self.launch_template:
+            version = self.launch_template.get_version(self.launch_template_version)
+            return version.instance_type
+
+        return self.launch_config.instance_type
+
+    @property
+    def user_data(self):
+        if self.launch_template:
+            version = self.launch_template.get_version(self.launch_template_version)
+            return version.user_data
+
+        return self.launch_config.user_data
+
+    @property
+    def security_groups(self):
+        if self.launch_template:
+            version = self.launch_template.get_version(self.launch_template_version)
+            return version.security_groups
+
+        return self.launch_config.security_groups
+
     def update(
         self,
         availability_zones,
@@ -400,6 +470,7 @@ class FakeAutoScalingGroup(CloudFormationModel):
         max_size,
         min_size,
         launch_config_name,
+        launch_template,
         vpc_zone_identifier,
         default_cooldown,
         health_check_period,
@@ -421,11 +492,8 @@ class FakeAutoScalingGroup(CloudFormationModel):
             if max_size is not None and max_size < len(self.instance_states):
                 desired_capacity = max_size
 
-        if launch_config_name:
+        self._set_launch_configuration(launch_config_name, launch_template)
-            self.launch_config = self.autoscaling_backend.launch_configurations[
+
-                launch_config_name
-            ]
-            self.launch_config_name = launch_config_name
         if health_check_period is not None:
             self.health_check_period = health_check_period
         if health_check_type is not None:
@@ -489,12 +557,13 @@ class FakeAutoScalingGroup(CloudFormationModel):
 
     def replace_autoscaling_group_instances(self, count_needed, propagated_tags):
         propagated_tags[ASG_NAME_TAG] = self.name
+
         reservation = self.autoscaling_backend.ec2_backend.add_instances(
-            self.launch_config.image_id,
+            self.image_id,
             count_needed,
-            self.launch_config.user_data,
+            self.user_data,
-            self.launch_config.security_groups,
+            self.security_groups,
-            instance_type=self.launch_config.instance_type,
+            instance_type=self.instance_type,
             tags={"instance": propagated_tags},
             placement=random.choice(self.availability_zones),
         )
@@ -586,6 +655,7 @@ class AutoScalingBackend(BaseBackend):
         max_size,
         min_size,
         launch_config_name,
+        launch_template,
         vpc_zone_identifier,
         default_cooldown,
         health_check_period,
@@ -609,7 +679,19 @@ class AutoScalingBackend(BaseBackend):
             health_check_period = 300
         else:
             health_check_period = make_int(health_check_period)
-        if launch_config_name is None and instance_id is not None:
+
+        # TODO: Add MixedInstancesPolicy once implemented.
+        # Verify only a single launch config-like parameter is provided.
+        params = [launch_config_name, launch_template, instance_id]
+        num_params = sum([1 for param in params if param])
+
+        if num_params != 1:
+            raise ValidationError(
+                "Valid requests must contain either LaunchTemplate, LaunchConfigurationName, "
+                "InstanceId or MixedInstancesPolicy parameter."
+            )
+
+        if instance_id:
             try:
                 instance = self.ec2_backend.get_instance(instance_id)
                 launch_config_name = name
@@ -626,6 +708,7 @@ class AutoScalingBackend(BaseBackend):
             max_size=max_size,
             min_size=min_size,
             launch_config_name=launch_config_name,
+            launch_template=launch_template,
             vpc_zone_identifier=vpc_zone_identifier,
             default_cooldown=default_cooldown,
             health_check_period=health_check_period,
@@ -635,6 +718,7 @@ class AutoScalingBackend(BaseBackend):
             placement_group=placement_group,
             termination_policies=termination_policies,
             autoscaling_backend=self,
+            ec2_backend=self.ec2_backend,
             tags=tags,
             new_instances_protected_from_scale_in=new_instances_protected_from_scale_in,
         )
@@ -652,6 +736,7 @@ class AutoScalingBackend(BaseBackend):
         max_size,
         min_size,
         launch_config_name,
+        launch_template,
         vpc_zone_identifier,
         default_cooldown,
         health_check_period,
@@ -660,19 +745,28 @@ class AutoScalingBackend(BaseBackend):
         termination_policies,
         new_instances_protected_from_scale_in=None,
     ):
+        # TODO: Add MixedInstancesPolicy once implemented.
+        # Verify only a single launch config-like parameter is provided.
+        if launch_config_name and launch_template:
+            raise ValidationError(
+                "Valid requests must contain either LaunchTemplate, LaunchConfigurationName "
+                "or MixedInstancesPolicy parameter."
+            )
+
         group = self.autoscaling_groups[name]
         group.update(
-            availability_zones,
+            availability_zones=availability_zones,
-            desired_capacity,
+            desired_capacity=desired_capacity,
-            max_size,
+            max_size=max_size,
-            min_size,
+            min_size=min_size,
-            launch_config_name,
+            launch_config_name=launch_config_name,
-            vpc_zone_identifier,
+            launch_template=launch_template,
-            default_cooldown,
+            vpc_zone_identifier=vpc_zone_identifier,
-            health_check_period,
+            default_cooldown=default_cooldown,
-            health_check_type,
+            health_check_period=health_check_period,
-            placement_group,
+            health_check_type=health_check_type,
-            termination_policies,
+            placement_group=placement_group,
+            termination_policies=termination_policies,
             new_instances_protected_from_scale_in=new_instances_protected_from_scale_in,
         )
         return group

moto/autoscaling/responses.py

@@ -81,6 +81,7 @@ class AutoScalingResponse(BaseResponse):
             min_size=self._get_int_param("MinSize"),
             instance_id=self._get_param("InstanceId"),
             launch_config_name=self._get_param("LaunchConfigurationName"),
+            launch_template=self._get_dict_param("LaunchTemplate."),
             vpc_zone_identifier=self._get_param("VPCZoneIdentifier"),
             default_cooldown=self._get_int_param("DefaultCooldown"),
             health_check_period=self._get_int_param("HealthCheckGracePeriod"),
@@ -197,6 +198,7 @@ class AutoScalingResponse(BaseResponse):
             max_size=self._get_int_param("MaxSize"),
             min_size=self._get_int_param("MinSize"),
             launch_config_name=self._get_param("LaunchConfigurationName"),
+            launch_template=self._get_dict_param("LaunchTemplate."),
             vpc_zone_identifier=self._get_param("VPCZoneIdentifier"),
             default_cooldown=self._get_int_param("DefaultCooldown"),
             health_check_period=self._get_int_param("HealthCheckGracePeriod"),
@@ -573,14 +575,31 @@ DESCRIBE_AUTOSCALING_GROUPS_TEMPLATE = """<DescribeAutoScalingGroupsResponse xml
         <HealthCheckType>{{ group.health_check_type }}</HealthCheckType>
         <CreatedTime>2013-05-06T17:47:15.107Z</CreatedTime>
         <EnabledMetrics/>
+        {% if group.launch_config_name %}
         <LaunchConfigurationName>{{ group.launch_config_name }}</LaunchConfigurationName>
+        {% elif group.launch_template %}
+        <LaunchTemplate>
+          <LaunchTemplateId>{{ group.launch_template.id }}</LaunchTemplateId>
+          <Version>{{ group.launch_template_version }}</Version>
+          <LaunchTemplateName>{{ group.launch_template.name }}</LaunchTemplateName>
+        </LaunchTemplate>
+        {% endif %}
         <Instances>
           {% for instance_state in group.instance_states %}
           <member>
             <HealthStatus>{{ instance_state.health_status }}</HealthStatus>
             <AvailabilityZone>{{ instance_state.instance.placement }}</AvailabilityZone>
             <InstanceId>{{ instance_state.instance.id }}</InstanceId>
+            <InstanceType>{{ instance_state.instance.instance_type }}</InstanceType>
+            {% if group.launch_config_name %}
             <LaunchConfigurationName>{{ group.launch_config_name }}</LaunchConfigurationName>
+            {% elif group.launch_template %}
+            <LaunchTemplate>
+              <LaunchTemplateId>{{ group.launch_template.id }}</LaunchTemplateId>
+              <Version>{{ group.launch_template_version }}</Version>
+              <LaunchTemplateName>{{ group.launch_template.name }}</LaunchTemplateName>
+            </LaunchTemplate>
+            {% endif %}
             <LifecycleState>{{ instance_state.lifecycle_state }}</LifecycleState>
             <ProtectedFromScaleIn>{{ instance_state.protected_from_scale_in|string|lower }}</ProtectedFromScaleIn>
           </member>
@@ -666,7 +685,16 @@ DESCRIBE_AUTOSCALING_INSTANCES_TEMPLATE = """<DescribeAutoScalingInstancesRespon
         <AutoScalingGroupName>{{ instance_state.instance.autoscaling_group.name }}</AutoScalingGroupName>
         <AvailabilityZone>{{ instance_state.instance.placement }}</AvailabilityZone>
         <InstanceId>{{ instance_state.instance.id }}</InstanceId>
+        <InstanceType>{{ instance_state.instance.instance_type }}</InstanceType>
+        {% if instance_state.instance.autoscaling_group.launch_config_name %}
         <LaunchConfigurationName>{{ instance_state.instance.autoscaling_group.launch_config_name }}</LaunchConfigurationName>
+        {% elif instance_state.instance.autoscaling_group.launch_template %}
+        <LaunchTemplate>
+          <LaunchTemplateId>{{ instance_state.instance.autoscaling_group.launch_template.id }}</LaunchTemplateId>
+          <Version>{{ instance_state.instance.autoscaling_group.launch_template_version }}</Version>
+          <LaunchTemplateName>{{ instance_state.instance.autoscaling_group.launch_template.name }}</LaunchTemplateName>
+        </LaunchTemplate>
+        {% endif %}
         <LifecycleState>{{ instance_state.lifecycle_state }}</LifecycleState>
         <ProtectedFromScaleIn>{{ instance_state.protected_from_scale_in|string|lower }}</ProtectedFromScaleIn>
       </member>

moto/core/responses.py

@@ -538,8 +538,8 @@ class BaseResponse(_TemplateEnvironmentMixin, ActionAuthenticatorMixin):
 
         returns
         {
-            "SlaveInstanceType": "m1.small",
+            "slave_instance_type": "m1.small",
-            "InstanceCount": "1",
+            "instance_count": "1",
         }
         """
         params = {}

moto/ec2/models.py

@@ -5386,6 +5386,22 @@ class LaunchTemplateVersion(object):
         self.description = description
         self.create_time = utc_date_and_time()
 
+    @property
+    def image_id(self):
+        return self.data.get("ImageId", "")
+
+    @property
+    def instance_type(self):
+        return self.data.get("InstanceType", "")
+
+    @property
+    def security_groups(self):
+        return self.data.get("SecurityGroups", [])
+
+    @property
+    def user_data(self):
+        return self.data.get("UserData", "")
+
 
 class LaunchTemplate(TaggedEC2Resource):
     def __init__(self, backend, name, template_data, version_description):

tests/test_autoscaling/test_autoscaling.py

@@ -17,6 +17,7 @@ from moto import (
     mock_elb,
     mock_autoscaling_deprecated,
     mock_ec2,
+    mock_cloudformation,
 )
 from tests.helpers import requires_boto_gte
 
@@ -164,7 +165,7 @@ def test_list_many_autoscaling_groups():
 
 @mock_autoscaling
 @mock_ec2
-def test_list_many_autoscaling_groups():
+def test_propogate_tags():
     mocked_networking = setup_networking()
     conn = boto3.client("autoscaling", region_name="us-east-1")
     conn.create_launch_configuration(LaunchConfigurationName="TestLC")
@@ -692,7 +693,7 @@ def test_detach_load_balancer():
 def test_create_autoscaling_group_boto3():
     mocked_networking = setup_networking()
     client = boto3.client("autoscaling", region_name="us-east-1")
-    _ = client.create_launch_configuration(
+    client.create_launch_configuration(
         LaunchConfigurationName="test_launch_configuration"
     )
     response = client.create_auto_scaling_group(
@@ -798,13 +799,171 @@ def test_create_autoscaling_group_from_invalid_instance_id():
 
 
 @mock_autoscaling
-def test_describe_autoscaling_groups_boto3():
+@mock_ec2
+def test_create_autoscaling_group_from_template():
+    mocked_networking = setup_networking()
+
+    ec2_client = boto3.client("ec2", region_name="us-east-1")
+    template = ec2_client.create_launch_template(
+        LaunchTemplateName="test_launch_template",
+        LaunchTemplateData={
+            "ImageId": "ami-0cc293023f983ed53",
+            "InstanceType": "t2.micro",
+        },
+    )["LaunchTemplate"]
+    client = boto3.client("autoscaling", region_name="us-east-1")
+    response = client.create_auto_scaling_group(
+        AutoScalingGroupName="test_asg",
+        LaunchTemplate={
+            "LaunchTemplateId": template["LaunchTemplateId"],
+            "Version": str(template["LatestVersionNumber"]),
+        },
+        MinSize=1,
+        MaxSize=3,
+        DesiredCapacity=2,
+        VPCZoneIdentifier=mocked_networking["subnet1"],
+        NewInstancesProtectedFromScaleIn=False,
+    )
+    response["ResponseMetadata"]["HTTPStatusCode"].should.equal(200)
+
+
+@mock_autoscaling
+@mock_ec2
+def test_create_autoscaling_group_no_template_ref():
+    mocked_networking = setup_networking()
+
+    ec2_client = boto3.client("ec2", region_name="us-east-1")
+    template = ec2_client.create_launch_template(
+        LaunchTemplateName="test_launch_template",
+        LaunchTemplateData={
+            "ImageId": "ami-0cc293023f983ed53",
+            "InstanceType": "t2.micro",
+        },
+    )["LaunchTemplate"]
+    client = boto3.client("autoscaling", region_name="us-east-1")
+
+    with assert_raises(ClientError) as ex:
+        client.create_auto_scaling_group(
+            AutoScalingGroupName="test_asg",
+            LaunchTemplate={"Version": str(template["LatestVersionNumber"])},
+            MinSize=0,
+            MaxSize=20,
+            DesiredCapacity=5,
+            VPCZoneIdentifier=mocked_networking["subnet1"],
+            NewInstancesProtectedFromScaleIn=False,
+        )
+    ex.exception.response["ResponseMetadata"]["HTTPStatusCode"].should.equal(400)
+    ex.exception.response["Error"]["Code"].should.equal("ValidationError")
+    ex.exception.response["Error"]["Message"].should.equal(
+        "Valid requests must contain either launchTemplateId or LaunchTemplateName"
+    )
+
+
+@mock_autoscaling
+@mock_ec2
+def test_create_autoscaling_group_multiple_template_ref():
+    mocked_networking = setup_networking()
+
+    ec2_client = boto3.client("ec2", region_name="us-east-1")
+    template = ec2_client.create_launch_template(
+        LaunchTemplateName="test_launch_template",
+        LaunchTemplateData={
+            "ImageId": "ami-0cc293023f983ed53",
+            "InstanceType": "t2.micro",
+        },
+    )["LaunchTemplate"]
+    client = boto3.client("autoscaling", region_name="us-east-1")
+
+    with assert_raises(ClientError) as ex:
+        client.create_auto_scaling_group(
+            AutoScalingGroupName="test_asg",
+            LaunchTemplate={
+                "LaunchTemplateId": template["LaunchTemplateId"],
+                "LaunchTemplateName": template["LaunchTemplateName"],
+                "Version": str(template["LatestVersionNumber"]),
+            },
+            MinSize=0,
+            MaxSize=20,
+            DesiredCapacity=5,
+            VPCZoneIdentifier=mocked_networking["subnet1"],
+            NewInstancesProtectedFromScaleIn=False,
+        )
+    ex.exception.response["ResponseMetadata"]["HTTPStatusCode"].should.equal(400)
+    ex.exception.response["Error"]["Code"].should.equal("ValidationError")
+    ex.exception.response["Error"]["Message"].should.equal(
+        "Valid requests must contain either launchTemplateId or LaunchTemplateName"
+    )
+
+
+@mock_autoscaling
+def test_create_autoscaling_group_boto3_no_launch_configuration():
     mocked_networking = setup_networking()
     client = boto3.client("autoscaling", region_name="us-east-1")
-    _ = client.create_launch_configuration(
+    with assert_raises(ClientError) as ex:
+        client.create_auto_scaling_group(
+            AutoScalingGroupName="test_asg",
+            MinSize=0,
+            MaxSize=20,
+            DesiredCapacity=5,
+            VPCZoneIdentifier=mocked_networking["subnet1"],
+            NewInstancesProtectedFromScaleIn=False,
+        )
+    ex.exception.response["ResponseMetadata"]["HTTPStatusCode"].should.equal(400)
+    ex.exception.response["Error"]["Code"].should.equal("ValidationError")
+    ex.exception.response["Error"]["Message"].should.equal(
+        "Valid requests must contain either LaunchTemplate, LaunchConfigurationName, "
+        "InstanceId or MixedInstancesPolicy parameter."
+    )
+
+
+@mock_autoscaling
+@mock_ec2
+def test_create_autoscaling_group_boto3_multiple_launch_configurations():
+    mocked_networking = setup_networking()
+
+    ec2_client = boto3.client("ec2", region_name="us-east-1")
+    template = ec2_client.create_launch_template(
+        LaunchTemplateName="test_launch_template",
+        LaunchTemplateData={
+            "ImageId": "ami-0cc293023f983ed53",
+            "InstanceType": "t2.micro",
+        },
+    )["LaunchTemplate"]
+    client = boto3.client("autoscaling", region_name="us-east-1")
+    client.create_launch_configuration(
         LaunchConfigurationName="test_launch_configuration"
     )
-    _ = client.create_auto_scaling_group(
+
+    with assert_raises(ClientError) as ex:
+        client.create_auto_scaling_group(
+            AutoScalingGroupName="test_asg",
+            LaunchConfigurationName="test_launch_configuration",
+            LaunchTemplate={
+                "LaunchTemplateId": template["LaunchTemplateId"],
+                "Version": str(template["LatestVersionNumber"]),
+            },
+            MinSize=0,
+            MaxSize=20,
+            DesiredCapacity=5,
+            VPCZoneIdentifier=mocked_networking["subnet1"],
+            NewInstancesProtectedFromScaleIn=False,
+        )
+    ex.exception.response["ResponseMetadata"]["HTTPStatusCode"].should.equal(400)
+    ex.exception.response["Error"]["Code"].should.equal("ValidationError")
+    ex.exception.response["Error"]["Message"].should.equal(
+        "Valid requests must contain either LaunchTemplate, LaunchConfigurationName, "
+        "InstanceId or MixedInstancesPolicy parameter."
+    )
+
+
+@mock_autoscaling
+def test_describe_autoscaling_groups_boto3_launch_config():
+    mocked_networking = setup_networking()
+    client = boto3.client("autoscaling", region_name="us-east-1")
+    client.create_launch_configuration(
+        LaunchConfigurationName="test_launch_configuration", InstanceType="t2.micro",
+    )
+    client.create_auto_scaling_group(
         AutoScalingGroupName="test_asg",
         LaunchConfigurationName="test_launch_configuration",
         MinSize=0,
@@ -818,22 +977,72 @@ def test_describe_autoscaling_groups_boto3():
     response["ResponseMetadata"]["HTTPStatusCode"].should.equal(200)
     group = response["AutoScalingGroups"][0]
     group["AutoScalingGroupName"].should.equal("test_asg")
+    group["LaunchConfigurationName"].should.equal("test_launch_configuration")
+    group.should_not.have.key("LaunchTemplate")
     group["AvailabilityZones"].should.equal(["us-east-1a"])
     group["VPCZoneIdentifier"].should.equal(mocked_networking["subnet1"])
     group["NewInstancesProtectedFromScaleIn"].should.equal(True)
     for instance in group["Instances"]:
+        instance["LaunchConfigurationName"].should.equal("test_launch_configuration")
+        instance.should_not.have.key("LaunchTemplate")
         instance["AvailabilityZone"].should.equal("us-east-1a")
         instance["ProtectedFromScaleIn"].should.equal(True)
+        instance["InstanceType"].should.equal("t2.micro")
 
 
 @mock_autoscaling
-def test_describe_autoscaling_instances_boto3():
+@mock_ec2
+def test_describe_autoscaling_groups_boto3_launch_template():
+    mocked_networking = setup_networking()
+    ec2_client = boto3.client("ec2", region_name="us-east-1")
+    template = ec2_client.create_launch_template(
+        LaunchTemplateName="test_launch_template",
+        LaunchTemplateData={
+            "ImageId": "ami-0cc293023f983ed53",
+            "InstanceType": "t2.micro",
+        },
+    )["LaunchTemplate"]
+    client = boto3.client("autoscaling", region_name="us-east-1")
+    client.create_auto_scaling_group(
+        AutoScalingGroupName="test_asg",
+        LaunchTemplate={"LaunchTemplateName": "test_launch_template", "Version": "1"},
+        MinSize=0,
+        MaxSize=20,
+        DesiredCapacity=5,
+        VPCZoneIdentifier=mocked_networking["subnet1"],
+        NewInstancesProtectedFromScaleIn=True,
+    )
+    expected_launch_template = {
+        "LaunchTemplateId": template["LaunchTemplateId"],
+        "LaunchTemplateName": "test_launch_template",
+        "Version": "1",
+    }
+
+    response = client.describe_auto_scaling_groups(AutoScalingGroupNames=["test_asg"])
+    response["ResponseMetadata"]["HTTPStatusCode"].should.equal(200)
+    group = response["AutoScalingGroups"][0]
+    group["AutoScalingGroupName"].should.equal("test_asg")
+    group["LaunchTemplate"].should.equal(expected_launch_template)
+    group.should_not.have.key("LaunchConfigurationName")
+    group["AvailabilityZones"].should.equal(["us-east-1a"])
+    group["VPCZoneIdentifier"].should.equal(mocked_networking["subnet1"])
+    group["NewInstancesProtectedFromScaleIn"].should.equal(True)
+    for instance in group["Instances"]:
+        instance["LaunchTemplate"].should.equal(expected_launch_template)
+        instance.should_not.have.key("LaunchConfigurationName")
+        instance["AvailabilityZone"].should.equal("us-east-1a")
+        instance["ProtectedFromScaleIn"].should.equal(True)
+        instance["InstanceType"].should.equal("t2.micro")
+
+
+@mock_autoscaling
+def test_describe_autoscaling_instances_boto3_launch_config():
     mocked_networking = setup_networking()
     client = boto3.client("autoscaling", region_name="us-east-1")
-    _ = client.create_launch_configuration(
+    client.create_launch_configuration(
-        LaunchConfigurationName="test_launch_configuration"
+        LaunchConfigurationName="test_launch_configuration", InstanceType="t2.micro",
     )
-    _ = client.create_auto_scaling_group(
+    client.create_auto_scaling_group(
         AutoScalingGroupName="test_asg",
         LaunchConfigurationName="test_launch_configuration",
         MinSize=0,
@@ -846,9 +1055,51 @@ def test_describe_autoscaling_instances_boto3():
     response = client.describe_auto_scaling_instances()
     len(response["AutoScalingInstances"]).should.equal(5)
     for instance in response["AutoScalingInstances"]:
+        instance["LaunchConfigurationName"].should.equal("test_launch_configuration")
+        instance.should_not.have.key("LaunchTemplate")
         instance["AutoScalingGroupName"].should.equal("test_asg")
         instance["AvailabilityZone"].should.equal("us-east-1a")
         instance["ProtectedFromScaleIn"].should.equal(True)
+        instance["InstanceType"].should.equal("t2.micro")
+
+
+@mock_autoscaling
+@mock_ec2
+def test_describe_autoscaling_instances_boto3_launch_template():
+    mocked_networking = setup_networking()
+    ec2_client = boto3.client("ec2", region_name="us-east-1")
+    template = ec2_client.create_launch_template(
+        LaunchTemplateName="test_launch_template",
+        LaunchTemplateData={
+            "ImageId": "ami-0cc293023f983ed53",
+            "InstanceType": "t2.micro",
+        },
+    )["LaunchTemplate"]
+    client = boto3.client("autoscaling", region_name="us-east-1")
+    client.create_auto_scaling_group(
+        AutoScalingGroupName="test_asg",
+        LaunchTemplate={"LaunchTemplateName": "test_launch_template", "Version": "1"},
+        MinSize=0,
+        MaxSize=20,
+        DesiredCapacity=5,
+        VPCZoneIdentifier=mocked_networking["subnet1"],
+        NewInstancesProtectedFromScaleIn=True,
+    )
+    expected_launch_template = {
+        "LaunchTemplateId": template["LaunchTemplateId"],
+        "LaunchTemplateName": "test_launch_template",
+        "Version": "1",
+    }
+
+    response = client.describe_auto_scaling_instances()
+    len(response["AutoScalingInstances"]).should.equal(5)
+    for instance in response["AutoScalingInstances"]:
+        instance["LaunchTemplate"].should.equal(expected_launch_template)
+        instance.should_not.have.key("LaunchConfigurationName")
+        instance["AutoScalingGroupName"].should.equal("test_asg")
+        instance["AvailabilityZone"].should.equal("us-east-1a")
+        instance["ProtectedFromScaleIn"].should.equal(True)
+        instance["InstanceType"].should.equal("t2.micro")
 
 
 @mock_autoscaling
@@ -885,13 +1136,16 @@ def test_describe_autoscaling_instances_instanceid_filter():
 
 
 @mock_autoscaling
-def test_update_autoscaling_group_boto3():
+def test_update_autoscaling_group_boto3_launch_config():
     mocked_networking = setup_networking()
     client = boto3.client("autoscaling", region_name="us-east-1")
-    _ = client.create_launch_configuration(
+    client.create_launch_configuration(
         LaunchConfigurationName="test_launch_configuration"
     )
-    _ = client.create_auto_scaling_group(
+    client.create_launch_configuration(
+        LaunchConfigurationName="test_launch_configuration_new"
+    )
+    client.create_auto_scaling_group(
         AutoScalingGroupName="test_asg",
         LaunchConfigurationName="test_launch_configuration",
         MinSize=0,
@@ -901,8 +1155,9 @@ def test_update_autoscaling_group_boto3():
         NewInstancesProtectedFromScaleIn=True,
     )
 
-    _ = client.update_auto_scaling_group(
+    client.update_auto_scaling_group(
         AutoScalingGroupName="test_asg",
+        LaunchConfigurationName="test_launch_configuration_new",
         MinSize=1,
         VPCZoneIdentifier="{subnet1},{subnet2}".format(
             subnet1=mocked_networking["subnet1"], subnet2=mocked_networking["subnet2"]
@@ -912,6 +1167,64 @@ def test_update_autoscaling_group_boto3():
 
     response = client.describe_auto_scaling_groups(AutoScalingGroupNames=["test_asg"])
     group = response["AutoScalingGroups"][0]
+    group["LaunchConfigurationName"].should.equal("test_launch_configuration_new")
+    group["MinSize"].should.equal(1)
+    set(group["AvailabilityZones"]).should.equal({"us-east-1a", "us-east-1b"})
+    group["NewInstancesProtectedFromScaleIn"].should.equal(False)
+
+
+@mock_autoscaling
+@mock_ec2
+def test_update_autoscaling_group_boto3_launch_template():
+    mocked_networking = setup_networking()
+    ec2_client = boto3.client("ec2", region_name="us-east-1")
+    ec2_client.create_launch_template(
+        LaunchTemplateName="test_launch_template",
+        LaunchTemplateData={
+            "ImageId": "ami-0cc293023f983ed53",
+            "InstanceType": "t2.micro",
+        },
+    )
+    template = ec2_client.create_launch_template(
+        LaunchTemplateName="test_launch_template_new",
+        LaunchTemplateData={
+            "ImageId": "ami-1ea5b10a3d8867db4",
+            "InstanceType": "t2.micro",
+        },
+    )["LaunchTemplate"]
+    client = boto3.client("autoscaling", region_name="us-east-1")
+    client.create_auto_scaling_group(
+        AutoScalingGroupName="test_asg",
+        LaunchTemplate={"LaunchTemplateName": "test_launch_template", "Version": "1"},
+        MinSize=0,
+        MaxSize=20,
+        DesiredCapacity=5,
+        VPCZoneIdentifier=mocked_networking["subnet1"],
+        NewInstancesProtectedFromScaleIn=True,
+    )
+
+    client.update_auto_scaling_group(
+        AutoScalingGroupName="test_asg",
+        LaunchTemplate={
+            "LaunchTemplateName": "test_launch_template_new",
+            "Version": "1",
+        },
+        MinSize=1,
+        VPCZoneIdentifier="{subnet1},{subnet2}".format(
+            subnet1=mocked_networking["subnet1"], subnet2=mocked_networking["subnet2"]
+        ),
+        NewInstancesProtectedFromScaleIn=False,
+    )
+
+    expected_launch_template = {
+        "LaunchTemplateId": template["LaunchTemplateId"],
+        "LaunchTemplateName": "test_launch_template_new",
+        "Version": "1",
+    }
+
+    response = client.describe_auto_scaling_groups(AutoScalingGroupNames=["test_asg"])
+    group = response["AutoScalingGroups"][0]
+    group["LaunchTemplate"].should.equal(expected_launch_template)
     group["MinSize"].should.equal(1)
     set(group["AvailabilityZones"]).should.equal({"us-east-1a", "us-east-1b"})
     group["NewInstancesProtectedFromScaleIn"].should.equal(False)
@@ -966,7 +1279,7 @@ def test_update_autoscaling_group_max_size_desired_capacity_change():
 
 
 @mock_autoscaling
-def test_autoscaling_taqs_update_boto3():
+def test_autoscaling_tags_update_boto3():
     mocked_networking = setup_networking()
     client = boto3.client("autoscaling", region_name="us-east-1")
     _ = client.create_launch_configuration(

tests/test_autoscaling/test_cloudformation.py

@@ -0,0 +1,276 @@
+import boto3
+import sure  # noqa
+
+from moto import (
+    mock_autoscaling,
+    mock_cloudformation,
+    mock_ec2,
+)
+
+from utils import setup_networking
+
+
+@mock_autoscaling
+@mock_cloudformation
+def test_launch_configuration():
+    cf_client = boto3.client("cloudformation", region_name="us-east-1")
+    client = boto3.client("autoscaling", region_name="us-east-1")
+
+    stack_name = "test-launch-configuration"
+
+    cf_template = """
+Resources:
+    LaunchConfiguration:
+        Type: AWS::AutoScaling::LaunchConfiguration
+        Properties:
+            ImageId: ami-0cc293023f983ed53
+            InstanceType: t2.micro
+            LaunchConfigurationName: test_launch_configuration
+Outputs:
+    LaunchConfigurationName:
+        Value: !Ref LaunchConfiguration
+""".strip()
+
+    cf_client.create_stack(
+        StackName=stack_name, TemplateBody=cf_template,
+    )
+    stack = cf_client.describe_stacks(StackName=stack_name)["Stacks"][0]
+    stack["Outputs"][0]["OutputValue"].should.be.equal("test_launch_configuration")
+
+    lc = client.describe_launch_configurations()["LaunchConfigurations"][0]
+    lc["LaunchConfigurationName"].should.be.equal("test_launch_configuration")
+    lc["ImageId"].should.be.equal("ami-0cc293023f983ed53")
+    lc["InstanceType"].should.be.equal("t2.micro")
+
+    cf_template = """
+Resources:
+    LaunchConfiguration:
+        Type: AWS::AutoScaling::LaunchConfiguration
+        Properties:
+            ImageId: ami-1ea5b10a3d8867db4
+            InstanceType: m5.large
+            LaunchConfigurationName: test_launch_configuration
+Outputs:
+    LaunchConfigurationName:
+        Value: !Ref LaunchConfiguration
+""".strip()
+
+    cf_client.update_stack(
+        StackName=stack_name, TemplateBody=cf_template,
+    )
+    stack = cf_client.describe_stacks(StackName=stack_name)["Stacks"][0]
+    stack["Outputs"][0]["OutputValue"].should.be.equal("test_launch_configuration")
+
+    lc = client.describe_launch_configurations()["LaunchConfigurations"][0]
+    lc["LaunchConfigurationName"].should.be.equal("test_launch_configuration")
+    lc["ImageId"].should.be.equal("ami-1ea5b10a3d8867db4")
+    lc["InstanceType"].should.be.equal("m5.large")
+
+
+@mock_autoscaling
+@mock_cloudformation
+def test_autoscaling_group_from_launch_config():
+    subnet_id = setup_networking()["subnet1"]
+
+    cf_client = boto3.client("cloudformation", region_name="us-east-1")
+    client = boto3.client("autoscaling", region_name="us-east-1")
+
+    client.create_launch_configuration(
+        LaunchConfigurationName="test_launch_configuration", InstanceType="t2.micro",
+    )
+    stack_name = "test-auto-scaling-group"
+
+    cf_template = """
+Parameters:
+    SubnetId:
+        Type: AWS::EC2::Subnet::Id
+Resources:
+    AutoScalingGroup:
+        Type: AWS::AutoScaling::AutoScalingGroup
+        Properties:
+            AutoScalingGroupName: test_auto_scaling_group
+            AvailabilityZones:
+                - us-east-1a
+            LaunchConfigurationName: test_launch_configuration
+            MaxSize: "5"
+            MinSize: "1"
+            VPCZoneIdentifier:
+                - !Ref SubnetId
+Outputs:
+    AutoScalingGroupName:
+        Value: !Ref AutoScalingGroup
+""".strip()
+
+    cf_client.create_stack(
+        StackName=stack_name,
+        TemplateBody=cf_template,
+        Parameters=[{"ParameterKey": "SubnetId", "ParameterValue": subnet_id}],
+    )
+    stack = cf_client.describe_stacks(StackName=stack_name)["Stacks"][0]
+    stack["Outputs"][0]["OutputValue"].should.be.equal("test_auto_scaling_group")
+
+    asg = client.describe_auto_scaling_groups()["AutoScalingGroups"][0]
+    asg["AutoScalingGroupName"].should.be.equal("test_auto_scaling_group")
+    asg["MinSize"].should.be.equal(1)
+    asg["MaxSize"].should.be.equal(5)
+    asg["LaunchConfigurationName"].should.be.equal("test_launch_configuration")
+
+    client.create_launch_configuration(
+        LaunchConfigurationName="test_launch_configuration_new",
+        InstanceType="t2.micro",
+    )
+
+    cf_template = """
+Parameters:
+    SubnetId:
+        Type: AWS::EC2::Subnet::Id
+Resources:
+    AutoScalingGroup:
+        Type: AWS::AutoScaling::AutoScalingGroup
+        Properties:
+            AutoScalingGroupName: test_auto_scaling_group
+            AvailabilityZones:
+                - us-east-1a
+            LaunchConfigurationName: test_launch_configuration_new
+            MaxSize: "6"
+            MinSize: "2"
+            VPCZoneIdentifier:
+                - !Ref SubnetId
+Outputs:
+    AutoScalingGroupName:
+        Value: !Ref AutoScalingGroup
+""".strip()
+
+    cf_client.update_stack(
+        StackName=stack_name,
+        TemplateBody=cf_template,
+        Parameters=[{"ParameterKey": "SubnetId", "ParameterValue": subnet_id}],
+    )
+    stack = cf_client.describe_stacks(StackName=stack_name)["Stacks"][0]
+    stack["Outputs"][0]["OutputValue"].should.be.equal("test_auto_scaling_group")
+
+    asg = client.describe_auto_scaling_groups()["AutoScalingGroups"][0]
+    asg["AutoScalingGroupName"].should.be.equal("test_auto_scaling_group")
+    asg["MinSize"].should.be.equal(2)
+    asg["MaxSize"].should.be.equal(6)
+    asg["LaunchConfigurationName"].should.be.equal("test_launch_configuration_new")
+
+
+@mock_autoscaling
+@mock_cloudformation
+@mock_ec2
+def test_autoscaling_group_from_launch_template():
+    subnet_id = setup_networking()["subnet1"]
+
+    cf_client = boto3.client("cloudformation", region_name="us-east-1")
+    ec2_client = boto3.client("ec2", region_name="us-east-1")
+    client = boto3.client("autoscaling", region_name="us-east-1")
+
+    template_response = ec2_client.create_launch_template(
+        LaunchTemplateName="test_launch_template",
+        LaunchTemplateData={
+            "ImageId": "ami-0cc293023f983ed53",
+            "InstanceType": "t2.micro",
+        },
+    )
+    launch_template_id = template_response["LaunchTemplate"]["LaunchTemplateId"]
+    stack_name = "test-auto-scaling-group"
+
+    cf_template = """
+Parameters:
+    SubnetId:
+        Type: AWS::EC2::Subnet::Id
+    LaunchTemplateId:
+        Type: String
+Resources:
+    AutoScalingGroup:
+        Type: AWS::AutoScaling::AutoScalingGroup
+        Properties:
+            AutoScalingGroupName: test_auto_scaling_group
+            AvailabilityZones:
+                - us-east-1a
+            LaunchTemplate:
+                LaunchTemplateId: !Ref LaunchTemplateId
+                Version: "1"
+            MaxSize: "5"
+            MinSize: "1"
+            VPCZoneIdentifier:
+                - !Ref SubnetId
+Outputs:
+    AutoScalingGroupName:
+        Value: !Ref AutoScalingGroup
+""".strip()
+
+    cf_client.create_stack(
+        StackName=stack_name,
+        TemplateBody=cf_template,
+        Parameters=[
+            {"ParameterKey": "SubnetId", "ParameterValue": subnet_id},
+            {"ParameterKey": "LaunchTemplateId", "ParameterValue": launch_template_id},
+        ],
+    )
+    stack = cf_client.describe_stacks(StackName=stack_name)["Stacks"][0]
+    stack["Outputs"][0]["OutputValue"].should.be.equal("test_auto_scaling_group")
+
+    asg = client.describe_auto_scaling_groups()["AutoScalingGroups"][0]
+    asg["AutoScalingGroupName"].should.be.equal("test_auto_scaling_group")
+    asg["MinSize"].should.be.equal(1)
+    asg["MaxSize"].should.be.equal(5)
+    lt = asg["LaunchTemplate"]
+    lt["LaunchTemplateId"].should.be.equal(launch_template_id)
+    lt["LaunchTemplateName"].should.be.equal("test_launch_template")
+    lt["Version"].should.be.equal("1")
+
+    template_response = ec2_client.create_launch_template(
+        LaunchTemplateName="test_launch_template_new",
+        LaunchTemplateData={
+            "ImageId": "ami-1ea5b10a3d8867db4",
+            "InstanceType": "m5.large",
+        },
+    )
+    launch_template_id = template_response["LaunchTemplate"]["LaunchTemplateId"]
+
+    cf_template = """
+Parameters:
+    SubnetId:
+        Type: AWS::EC2::Subnet::Id
+    LaunchTemplateId:
+        Type: String
+Resources:
+    AutoScalingGroup:
+        Type: AWS::AutoScaling::AutoScalingGroup
+        Properties:
+            AutoScalingGroupName: test_auto_scaling_group
+            AvailabilityZones:
+                - us-east-1a
+            LaunchTemplate:
+                LaunchTemplateId: !Ref LaunchTemplateId
+                Version: "1"
+            MaxSize: "6"
+            MinSize: "2"
+            VPCZoneIdentifier:
+                - !Ref SubnetId
+Outputs:
+    AutoScalingGroupName:
+        Value: !Ref AutoScalingGroup
+""".strip()
+
+    cf_client.update_stack(
+        StackName=stack_name,
+        TemplateBody=cf_template,
+        Parameters=[
+            {"ParameterKey": "SubnetId", "ParameterValue": subnet_id},
+            {"ParameterKey": "LaunchTemplateId", "ParameterValue": launch_template_id},
+        ],
+    )
+    stack = cf_client.describe_stacks(StackName=stack_name)["Stacks"][0]
+    stack["Outputs"][0]["OutputValue"].should.be.equal("test_auto_scaling_group")
+
+    asg = client.describe_auto_scaling_groups()["AutoScalingGroups"][0]
+    asg["AutoScalingGroupName"].should.be.equal("test_auto_scaling_group")
+    asg["MinSize"].should.be.equal(2)
+    asg["MaxSize"].should.be.equal(6)
+    lt = asg["LaunchTemplate"]
+    lt["LaunchTemplateId"].should.be.equal(launch_template_id)
+    lt["LaunchTemplateName"].should.be.equal("test_launch_template_new")
+    lt["Version"].should.be.equal("1")