Adding Elastic IP to ec2 instance using cloudformation - amazon-web-services

Question

Is where anyway I could attach elastic ip from my cloudformation template?
{
"Description" : "Staging single instance",
"Outputs": {
"InstanceID": {
"Description": "The WWW instance id",
"Value": { "Ref": "StageInstance" }
}
},
"Parameters": {
"AMI": {
"Description": "The Amazon Ubuntu AMI",
"Type": "String",
"Default": "ami-009110a2bf8d7dd0a"
},
"EBSVolumeSize": {
"Description": "The size of the EBS volume for the transcoder",
"Type": "String",
"Default": "20"
},
"InstanceType": {
"AllowedValues": [
"t2.micro",
"t2.small",
"t2.medium",
"t2.large",
"c4.large",
"c4.xlarge",
"c4.2xlarge",
"c4.4xlarge",
"c4.8xlarge",
"t3.medium"
],
"ConstraintDescription": "must be a valid EC2 instance type",
"Default": "t2.micro",
"Description": "EC2 instance type",
"Type": "String"
},
"KeyName": {
"Description" : "Name of an existing EC2 KeyPair to enable SSH access to NAT instances.",
"Type": "AWS::EC2::KeyPair::KeyName",
"ConstraintDescription" : "Must be the name of an existing EC2 KeyPair." }
},
"Resources": {
"InstanceProfile" : {
"Type" : "AWS::IAM::InstanceProfile",
"Properties" : {
"Path" : "/",
"Roles" : ["Ec2CloudDeploy"]
}
},
"StageSecurityGroup": {
"Type": "AWS::EC2::SecurityGroup",
"Properties": {
"GroupDescription": "Allow SSH, HTTP, and HTTPS access",
"SecurityGroupIngress": [
{
"IpProtocol": "tcp",
"FromPort": "22",
"ToPort": "22",
"CidrIp": "0.0.0.0/0"
},
{
"IpProtocol": "tcp",
"FromPort": "80",
"ToPort": "80",
"CidrIp": "0.0.0.0/0"
},
{
"IpProtocol": "tcp",
"FromPort": "443",
"ToPort": "443",
"CidrIp": "0.0.0.0/0"
}
]
}
},
"StageInstance": {
"Type" : "AWS::EC2::Instance",
"Properties": {
"SecurityGroupIds": [{"Ref": "StageSecurityGroup"}],
"KeyName": {"Ref": "KeyName" },
"ImageId": {"Ref": "AMI"},
"InstanceType": {"Ref": "InstanceType"},
"IamInstanceProfile" : {"Ref" : "InstanceProfile"},
"Tags": [
{"Key" : "Staging", "Value" : "Staging"}
]
}
}
}
}
Is there any configuration which I can add to attach the elastic ip to the instance which would be launched by this instance.I know I can attach it using cli command buT i would like to add it through my cloudformation template.

Answer 1

You would use AWS::EC2::EIPAssociation:
{
"Type" : "AWS::EC2::EIPAssociation",
"Properties" : {
"AllocationId" : String,
"EIP" : String,
"InstanceId" : String,
"NetworkInterfaceId" : String,
"PrivateIpAddress" : String
}
}

Answer 2

Sure. as documented in AWS::EC2::EIP:
Specifies an Elastic IP (EIP) address and can, optionally, associate it with an Amazon EC2 instance.
By setting InstanceId, you associate the EIP to your CloudFormation's EC2 instance.
For your case this snippet should do the trick:
"Resources": {
...,
"ElasticIP": {
"Type": "AWS::EC2::EIP",
"Properties": {
"InstanceId": {"Ref" : "StageInstance"}
}
}
}