class aws_cdk.aws_ec2.Instance(scope, id, *, instance_type, machine_image, vpc, allow_all_ipv6_outbound=None, allow_all_outbound=None, associate_public_ip_address=None, availability_zone=None, block_devices=None, credit_specification=None, detailed_monitoring=None, init=None, init_options=None, instance_name=None, key_name=None, key_pair=None, private_ip_address=None, propagate_tags_to_volume_on_creation=None, require_imdsv2=None, resource_signal_timeout=None, role=None, security_group=None, source_dest_check=None, ssm_session_permissions=None, user_data=None, user_data_causes_replacement=None, vpc_subnets=None)

Bases: Resource

This represents a single EC2 instance.




# vpc: ec2.IVpc

lb = elb.LoadBalancer(self, "LB",

# instance to add as the target for load balancer.
instance = ec2.Instance(self, "targetInstance",
    instance_type=ec2.InstanceType.of(ec2.InstanceClass.BURSTABLE2, ec2.InstanceSize.MICRO),
  • scope (Construct) –

  • id (str) –

  • instance_type (InstanceType) – Type of instance to launch.

  • machine_image (IMachineImage) – AMI to launch.

  • vpc (IVpc) – VPC to launch the instance in.

  • allow_all_ipv6_outbound (Optional[bool]) – Whether the instance could initiate IPv6 connections to anywhere by default. This property is only used when you do not provide a security group. Default: false

  • allow_all_outbound (Optional[bool]) – Whether the instance could initiate connections to anywhere by default. This property is only used when you do not provide a security group. Default: true

  • associate_public_ip_address (Optional[bool]) – Whether to associate a public IP address to the primary network interface attached to this instance. Default: - public IP address is automatically assigned based on default behavior

  • availability_zone (Optional[str]) – In which AZ to place the instance within the VPC. Default: - Random zone.

  • block_devices (Optional[Sequence[Union[BlockDevice, Dict[str, Any]]]]) – Specifies how block devices are exposed to the instance. You can specify virtual devices and EBS volumes. Each instance that is launched has an associated root device volume, either an Amazon EBS volume or an instance store volume. You can use block device mappings to specify additional EBS volumes or instance store volumes to attach to an instance when it is launched. Default: - Uses the block device mapping of the AMI

  • credit_specification (Optional[CpuCredits]) – Specifying the CPU credit type for burstable EC2 instance types (T2, T3, T3a, etc). The unlimited CPU credit option is not supported for T3 instances with a dedicated host. Default: - T2 instances are standard, while T3, T4g, and T3a instances are unlimited.

  • detailed_monitoring (Optional[bool]) – Whether “Detailed Monitoring” is enabled for this instance Keep in mind that Detailed Monitoring results in extra charges. Default: - false

  • init (Optional[CloudFormationInit]) – Apply the given CloudFormation Init configuration to the instance at startup. Default: - no CloudFormation init

  • init_options (Union[ApplyCloudFormationInitOptions, Dict[str, Any], None]) – Use the given options for applying CloudFormation Init. Describes the configsets to use and the timeout to wait Default: - default options

  • instance_name (Optional[str]) – The name of the instance. Default: - CDK generated name

  • key_name (Optional[str]) – (deprecated) Name of SSH keypair to grant access to instance. Default: - No SSH access will be possible.

  • key_pair (Optional[IKeyPair]) – The SSH keypair to grant access to the instance. Default: - No SSH access will be possible.

  • private_ip_address (Optional[str]) – Defines a private IP address to associate with an instance. Private IP should be available within the VPC that the instance is build within. Default: - no association

  • propagate_tags_to_volume_on_creation (Optional[bool]) – Propagate the EC2 instance tags to the EBS volumes. Default: - false

  • require_imdsv2 (Optional[bool]) – Whether IMDSv2 should be required on this instance. Default: - false

  • resource_signal_timeout (Optional[Duration]) – The length of time to wait for the resourceSignalCount. The maximum value is 43200 (12 hours). Default: Duration.minutes(5)

  • role (Optional[IRole]) – An IAM role to associate with the instance profile assigned to this Auto Scaling Group. The role must be assumable by the service principal Default: - A role will automatically be created, it can be accessed via the role property

  • security_group (Optional[ISecurityGroup]) – Security Group to assign to this instance. Default: - create new security group

  • source_dest_check (Optional[bool]) – Specifies whether to enable an instance launched in a VPC to perform NAT. This controls whether source/destination checking is enabled on the instance. A value of true means that checking is enabled, and false means that checking is disabled. The value must be false for the instance to perform NAT. Default: true

  • ssm_session_permissions (Optional[bool]) – Add SSM session permissions to the instance role. Setting this to true adds the necessary permissions to connect to the instance using SSM Session Manager. You can do this from the AWS Console. NOTE: Setting this flag to true may not be enough by itself. You must also use an AMI that comes with the SSM Agent, or install the SSM Agent yourself. See Working with SSM Agent in the SSM Developer Guide. Default: false

  • user_data (Optional[UserData]) – Specific UserData to use. The UserData may still be mutated after creation. Default: - A UserData object appropriate for the MachineImage’s Operating System is created.

  • user_data_causes_replacement (Optional[bool]) – Changes to the UserData force replacement. Depending the EC2 instance type, changing UserData either restarts the instance or replaces the instance. - Instance store-backed instances are replaced. - EBS-backed instances are restarted. By default, restarting does not execute the new UserData so you will need a different mechanism to ensure the instance is restarted. Setting this to true will make the instance’s Logical ID depend on the UserData, which will cause CloudFormation to replace it if the UserData changes. Default: - true iff initOptions is specified, false otherwise.

  • vpc_subnets (Union[SubnetSelection, Dict[str, Any], None]) – Where to place the instance within the VPC. Default: - Private subnets.



Add the security group to the instance.


security_group (ISecurityGroup) – : The security group to add.

Return type:



Adds a statement to the IAM role assumed by the instance.


statement (PolicyStatement) –

Return type:



Add command to the startup script of the instance.

The command must be in the scripting language supported by the instance’s OS (i.e. Linux/Windows).


commands (str) –

Return type:



Apply the given removal policy to this resource.

The Removal Policy controls what happens to this resource when it stops being managed by CloudFormation, either because you’ve removed it from the CDK application or because you’ve made a change that requires the resource to be replaced.

The resource can be deleted (RemovalPolicy.DESTROY), or left in your AWS account for data recovery and cleanup later (RemovalPolicy.RETAIN).


policy (RemovalPolicy) –

Return type:



Returns a string representation of this construct.

Return type:




Allows specify security group connections for the instance.


The environment this resource belongs to.

For resources that are created and managed by the CDK (generally, those created by creating new class instances like Role, Bucket, etc.), this is always the same as the environment of the stack they belong to; however, for imported resources (those obtained from static methods like fromRoleArn, fromBucketName, etc.), that might be different than the stack they were imported into.


The principal to grant permissions to.


the underlying instance resource.


The availability zone the instance was launched in.




The instance’s ID.




Private DNS name for this instance.




Private IP for this instance.




Publicly-routable DNS name for this instance.

(May be an empty string if the instance does not have a public name).




Publicly-routable IP address for this instance.

(May be an empty string if the instance does not have a public IP).




The tree node.


The type of OS the instance is running.


The IAM role assumed by the instance.


The stack in which this resource is defined.


UserData for the instance.

Static Methods

classmethod is_construct(x)

Checks if x is a construct.

Use this method instead of instanceof to properly detect Construct instances, even when the construct library is symlinked.

Explanation: in JavaScript, multiple copies of the constructs library on disk are seen as independent, completely different libraries. As a consequence, the class Construct in each copy of the constructs library is seen as a different class, and an instance of one class will not test as instanceof the other class. npm install will not create installations like this, but users may manually symlink construct libraries together or use a monorepo tool: in those cases, multiple copies of the constructs library can be accidentally installed, and instanceof will behave unpredictably. It is safest to avoid using instanceof, and using this type-testing method instead.


x (Any) – Any object.

Return type:



true if x is an object created from a class which extends Construct.

classmethod is_owned_resource(construct)

Returns true if the construct was created by CDK, and false otherwise.


construct (IConstruct) –

Return type:


classmethod is_resource(construct)

Check whether the given construct is a Resource.


construct (IConstruct) –

Return type: