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ec2-rotate-ip

A script that can be run periodically to change the public-facing IP on one or more EC2 instances in a region.

Pre-requisites

Ensure the following pre-requisites before running the script.

Instances

For any instance that should have its public IP rotated:

  1. Associate an Elastic IP with that instance.
  2. Create a tag on the Elastic IP:
    • rotate=1 (key="rotate", value="1")

Environment

You will need Node.js installed and your environment configured with credentials to use the AWS Node.js SDK.

Required AWS permissions:

  • ec2:ReleaseAddress
  • ec2:DescribeAddresses
  • ec2:CreateTags
  • ec2:AssociateAddress
  • ec2:AllocateAddress

Example IAM policy:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "ec2:ReleaseAddress",
                "ec2:DescribeAddresses",
                "ec2:CreateTags",
                "ec2:AssociateAddress",
                "ec2:AllocateAddress"
            ],
            "Resource": "*"
        }
    ]
}

Environment configuration instructions:

https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/setting-credentials-node.html

Instructions

Run the following command whenever you want to rotate IPs:

AWS_REGION=us-east-1 npx ec2-rotate-ip