wtfiwtz / stable-ec2-hostnames

Get stable EC2 hostnames based on EC2 host discovery of roles

Creates a stable EC2 hostname using EC2 host discovery

This is based on the wonderful cap-ec2 gem... https://github.com/forward3d/cap-ec2

Customize it for your environment and then add it to your server build (e.g. Cloudformation).

gem install bundler
bundle install
AWS_ACCESS_KEY_ID=x AWS_SECRET_ACCESS_KEY=y ruby dns_name.rb production Worker worker your-domain.com

This will create the name production-Worker-1.your-domain.com based on a looking of specific Role, Project and Stage tags.

You should have a Name tag such as production-Worker-1 or production-App-1.

You will need a IAM policy to allow host discovery for your IAM user (minimum ec2:DescribeInstances, ec2:DescribeTags, ec2:CreateTags):

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Stmt1498026418000",
            "Effect": "Allow",
            "Action": [
                "ec2:Describe*",
                "ec2:CreateTags",
                "ec2:DeleteTags",
                "ec2:ModifyInstanceAttribute"
            ],
            "Resource": [
                "*"
            ]
        }
    ]
}