Allocate and associate Elastic IP addresses with AWS CloudFormation

The following template snippets are examples related to Elastic IP addresses (EIPs) in Amazon EC2. These examples cover allocation, association, and management of EIPs for your instances.

Allocate an Elastic IP address and associate it with an Amazon EC2 instance

The following snippet allocates an Amazon EC2 Elastic IP (EIP) address and associates it with an Amazon EC2 instance using an AWS::EC2::EIP resource. You can allocate an EIP address from an address pool owned by AWS or from an address pool created from a public IPv4 address range you bring to AWS for use with your AWS resources using bring your own IP addresses (BYOIP). In this example, the EIP is allocated from an address pool owned by AWS.

For more information about Elastic IP addresses, see Elastic IP address in the Amazon EC2 User Guide.

"ElasticIP": {
    "Type": "AWS::EC2::EIP",
    "Properties": {
        "InstanceId": {
            "Ref": "Ec2Instance"
        }
    }
}

ElasticIP:
  Type: AWS::EC2::EIP
  Properties:
    InstanceId: !Ref EC2Instance

Associate an Elastic IP address to an Amazon EC2 instance by specifying the IP address

The following snippet associates an existing Amazon EC2 Elastic IP address to an EC2 instance using an AWS::EC2::EIPAssociation resource. You must first allocate an Elastic IP address for use in your account. An Elastic IP address can be associated with a single instance.

"IPAssoc": {
  "Type": "AWS::EC2::EIPAssociation",
  "Properties": {
    "InstanceId": {
      "Ref": "Ec2Instance"
    },
    "EIP": "192.0.2.0"
  }
}

IPAssoc:
  Type: AWS::EC2::EIPAssociation
  Properties:
    InstanceId: !Ref EC2Instance
    EIP: 192.0.2.0

Associate an Elastic IP address to an Amazon EC2 instance by specifying the allocation ID of the IP address

The following snippet associates an existing Elastic IP address to an Amazon EC2 instance by specifying the allocation ID using an AWS::EC2::EIPAssociation resource. An allocation ID is assigned to an Elastic IP address upon Elastic IP address allocation.

"IPAssoc": {
    "Type": "AWS::EC2::EIPAssociation",
    "Properties": {
        "InstanceId": {
            "Ref": "Ec2Instance"
        },
        "AllocationId": "eipalloc-1234567890abcdef0"
    }
}

IPAssoc:
  Type: AWS::EC2::EIPAssociation
  Properties:
    InstanceId: !Ref EC2Instance
    AllocationId: eipalloc-1234567890abcdef0