Fn::GetAtt
The Fn::GetAtt intrinsic function returns the value of an attribute
from a resource in the template.
Declaration
JSON
{ "Fn::GetAtt" : [ "logicalNameOfResource", "attributeName" ] }
YAML
Syntax for the full function name:
Fn::GetAtt: [logicalNameOfResource,attributeName]
Syntax for the short form:
!GetAttlogicalNameOfResource.attributeName
Parameters
logicalNameOfResource-
The logical name (also called logical ID) of the resource that contains the attribute that you want.
attributeName-
The name of the resource-specific attribute whose value you want. See the resource's reference page for details about the attributes available for that resource type.
Return Value
The attribute value.
Examples
Return a String
This example snippet returns a string containing the DNS name of the load balancer
with the
logical name myELB.
JSON
"Fn::GetAtt" : [ "myELB" , "DNSName" ]
YAML
!GetAtt myELB.DNSName
Return Multiple Strings
The following example template returns the SourceSecurityGroup.OwnerAlias and
SourceSecurityGroup.GroupName of the load balancer with the
logical name myELB.
JSON
{ "AWSTemplateFormatVersion": "2010-09-09", "Resources": { "myELB": { "Type": "AWS::ElasticLoadBalancing::LoadBalancer", "Properties": { "AvailabilityZones": [ "eu-west-1a" ], "Listeners": [ { "LoadBalancerPort": "80", "InstancePort": "80", "Protocol": "HTTP" } ] } }, "myELBIngressGroup": { "Type": "AWS::EC2::SecurityGroup", "Properties": { "GroupDescription": "ELB ingress group", "SecurityGroupIngress": [ { "IpProtocol": "tcp", "FromPort": "80", "ToPort": "80", "SourceSecurityGroupOwnerId": { "Fn::GetAtt": [ "myELB", "SourceSecurityGroup", "OwnerAlias" ] }, "SourceSecurityGroupName": { "Fn::GetAtt": [ "myELB", "SourceSecurityGroup", "GroupName" ] } } ] } } } }
YAML
AWSTemplateFormatVersion: 2010-09-09 Resources: myELB: Type: AWS::ElasticLoadBalancing::LoadBalancer Properties: AvailabilityZones: - eu-west-1a Listeners: - LoadBalancerPort: '80' InstancePort: '80' Protocol: HTTP myELBIngressGroup: Type: AWS::EC2::SecurityGroup Properties: GroupDescription: ELB ingress group SecurityGroupIngress: - IpProtocol: tcp FromPort: '80' ToPort: '80' SourceSecurityGroupOwnerId: !GetAtt myELB.SourceSecurityGroup.OwnerAlias SourceSecurityGroupName: !GetAtt myELB.SourceSecurityGroup.GroupName
Supported Functions
For the Fn::GetAtt logical resource name, you cannot use functions. You
must specify a string that is a resource's logical ID.
For the Fn::GetAtt attribute name, you can use the Ref
function.
Attributes
You can retrieve the following attributes using Fn::GetAtt.
| Resource TypeName | Attribute | Description |
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| AWS::AmazonMQ::Broker | Arn |
The Amazon Resource Name (ARN) of the Amazon MQ broker. Example:arn:aws:mq:us-east-2:123456789012:broker:MyBroker:b-1234a5b6-78cd-901e-2fgh-3i45j6k178l9 |
| AWS::AmazonMQ::Broker | ConfigurationId |
The unique ID that Amazon MQ generates for the configuration. Example:c-1234a5b6-78cd-901e-2fgh-3i45j6k178l9 |
| AWS::AmazonMQ::Broker | ConfigurationRevision |
The revision number of the Amazon MQ configuration. Example:1 |
| AWS::AmazonMQ::Configuration | Arn |
The Amazon Resource Name (ARN) of the Amazon MQ configuration. Example:arn:aws:mq:us-east-2:123456789012:configuration:MyConfigurationDevelopment:c-1234a5b6-78cd-901e-2fgh-3i45j6k178l9 |
| AWS::AmazonMQ::Configuration | Revision |
The revision number of the Amazon MQ configuration. Example:1 |
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The Amazon CloudFront distribution domain name that is mapped to the custom domain name. Example: |
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The root resource ID for a Example: |
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The Amazon Resource Name (ARN) of the AWS Cloud9 development environment. Example:
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The name of the AWS Cloud9 development environment. Example: |
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A JSON-format string containing the Example of a wait condition with two signals:
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The output value from the nested stack that you specified, where
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The Amazon Resource Name (ARN) of the Amazon SNS topic that is associated with the CloudTrail trail. Example: |
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The pipeline version. Example: |
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AWS::DirectoryService::MicrosoftAD and AWS::DirectoryService::SimpleAD |
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The alias for a directory. Examples: |
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AWS::DirectoryService::MicrosoftAD and AWS::DirectoryService::SimpleAD |
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The IP addresses of the DNS servers for the directory. Example: |
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The Amazon Resource Name (ARN) of the DynamoDB table stream. To use this
attribute, you must specify the DynamoDB table Example:
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The ID that AWS assigns to represent the allocation of the address for use with Amazon VPC. It is returned only for VPC Elastic IP addresses. Example: |
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The Availability Zone where the instance that you specified is launched. Example: |
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The private DNS name of the instance that you specified. Example: |
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The public DNS name of the instance that you specified. Example: |
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The private IP address of the instance that you specified. Example: |
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The public IP address of the instance that you specified. Example: |
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The primary private IP address of the network interface that you specified. Example: |
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The secondary private IP addresses of the network interface that you specified. Example: |
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The group ID of the specified security group. Example: |
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The Availability Zone of the subnet. Example: |
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A list of IPv6 CIDR blocks that are associated with the subnet. Example: |
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The ID of the network ACL that is associated with the subnet's VPC. Example: |
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The ID of the subnet's VPC. Example: |
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The set of IP addresses for the VPC. Example: |
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A list of IPv4 CIDR block association IDs for the VPC. Example: |
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The default network ACL ID that is associated with the VPC, which AWS creates when you create a VPC. Example: |
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The default security group ID that is associated with the VPC, which AWS creates when you create a VPC. Example: |
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A list of IPv6 CIDR blocks that are associated with the VPC. Example: |
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The name of an Amazon Elastic Container Service service. Example: |
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The ARN of the cluster. Example: |
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The |
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The endpoint for your Kubernetes API server. Example: |
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The DNS address of the configuration endpoint for the Memcached cache cluster. Example:
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The port number of the configuration endpoint for the Memcached cache cluster. |
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The DNS address of the configuration endpoint for the Redis cache cluster. Example:
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The port number of the configuration endpoint for the Redis cache cluster. |
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The DNS hostname of the cache node. |
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The port number that the cache engine is listening on. |
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The DNS address of the primary read-write cache node. |
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The port number that the primary read-write cache engine is listening on. |
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A string with a list of endpoints for the read-only replicas. The order
of the addresses maps to the order of the ports from the
Example:
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A string with a list of ports for the read-only replicas. The order of
the ports maps to the order of the addresses from the
Example: |
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A list of endpoints for the read-only replicas. Example:
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A list of ports for the read-only replicas. Example: |
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The URL to the load balancer for this environment. Example:
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The name of the Route 53-hosted zone that is associated with the load balancer. Example:
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The ID of the Route 53 hosted zone name that is associated with the l oad balancer. Example: |
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The DNS name for the load balancer. Example:
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The security group that you can use as part of your inbound rules for your load balancer's back-end Amazon EC2 application instances. Example: |
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The owner of the source security group. Example: |
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The DNS name for the application load balancer. Example:
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The ID of the Amazon Route 53-hosted zone name that is associated with the load balancer. Example: |
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The full name of the application load balancer. Example: |
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The name of the application load balancer. Example: |
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The IDs of the security groups for the application load balancer. Example: |
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The Amazon Resource Names (ARNs) of the load balancers that route traffic to this target group. Example: |
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The full name of the target group.
Example:
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The name of the target group.
Example:
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The Amazon Resource Name (ARN) of the domain. Example:
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The domain-specific endpoint that is used to submit index, search, and data upload requests to an Amazon Elasticsearch Service domain. Example:
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The public DNS name of the master node (instance). Example:
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The secret access key for the specified Example: |
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Arn |
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arn:aws:iot:ap-southeast-2:123456789012:cert/a1234567b89c012d3e4fg567hij8k9l01mno1p23q45678901rs234567890t1u2 |
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The version of a Lambda function. Example: |
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The Availability Zone of an AWS OpsWorks instance. Example: |
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The private DNS name of an AWS OpsWorks instance. |
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The private IP address of an AWS OpsWorks instance. |
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The public DNS name of an AWS OpsWorks instance. |
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The public IP address of an AWS OpsWorks instance. Note To use this attribute, the AWS OpsWorks instance must be in an AWS OpsWorks layer that auto-assigns public IP addresses. Example: |
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The SSH user name of an AWS OpsWorks instance. |
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The connection endpoint for the cluster. Example:
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The connection port for the cluster. Example: |
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| AWS::RDS::DBCluster |
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The connection endpoint for the DB cluster. Example:
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The port number on which the DB cluster accepts connections. Example: |
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The reader endpoint for the DB cluster. Example: |
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The connection endpoint for the database. Example:
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The port number on which the database accepts connections. Example: |
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The set of name servers for the specific hosted zone. Example: This attribute is not supported for private hosted zones. |
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The DNS name of the specified bucket. Example:
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The IPv6 DNS name of the specified bucket. Example:
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The Amazon S3 website endpoint for the specified bucket. Example:
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The ARN of an |
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| AWS::SNS::Topic | TopicName |
The name of an Amazon SNS topic. Example: |
| AWS::StepFunctions::Activity | Name |
The name of the AWS Step Functions activity. |
| AWS::StepFunctions::StateMachine | Name |
The name of the Step Functions state machine. |
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The name of an Amazon SQS queue. Example: |
