Ensure all unused Elastic IPs are deleted

Error: Unused Elastic IPs are present

Bridgecrew Policy ID: BC_AWS_GENERAL_19
Severity: LOW

Unused Elastic IPs are present

Description

AWS charges for unused or unallocated Elastic IPs as these are a finite resource. Elastic IPs can sometimes be overlooked when infrastructure is decommissioned. Its is sub-optimal to pay for a resource you aren't using. Checking for unused Elastic IPs enables costs to be aligned with usage.

Fix - Runtime

EC2 console

Open your AWS console to EC2 for your region e.g. https://eu-west-2.console.aws.amazon.com/ec2/v2/home?region=eu-west-2#Addresses:

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If you have any unallocated Public IPs (They will show no value for Association ID), select them and choose "Release Elastic IP address".

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CLI command

If you run the AWS cli command:
aws ec2 describe-addresses

Find all the Elastics IPs that don't have an allocated id and then use:

aws ec2 release-address --public-ip <theIPyoudontneed>

https://docs.aws.amazon.com/cli/latest/reference/ec2/release-address.html

Fix - Buildtime

Terraform

In the unlikely event that you have an unallocated elastic IP in Terraform, then you will need to de-provision it with Terraform destroy:

resource "aws_eip" "lonely-ip" {}

CloudFormation

  • Resource: "AWS::EC2::EIP"
    If you have managed to provision an unassociated Elastic IP in Cloudformation, you will need to find the resource that has the type: "Type" : "AWS::EC2::EIP" and delete that section. Make sure there is no AWS::EC2::EIPAssociation for that Elastic IP and double check its association before attempting the edit.

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