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CrossAccountIAM.md

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Cross-Account IAM User/Role

Setup IAM role

  1. Note the username and ARM of your automation IAM user in your root account
  2. Update "ec2:ResourceTag/Owner": with the username from step 1
    1. Note the user ARN
  3. Create an IAM role with the updated policy under your target account where EC2 instances will run and note the Role ARN

IAM role policy

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "ec2:StartInstances",
                "ec2:RunInstances",
                "ec2:DescribeInstances",
                "ec2:DescribeInstanceStatus",
                "ec2:DescribeInstanceTypes",
                "ec2:DescribeSubnets",
                "ec2:describeSpotPriceHistory",
                "pricing:GetProducts",
                "pricing:GetAttributeValues",
                "ec2:DescribeImages"
            ],
            "Resource": "*",
            "Effect": "Allow"
        },
        {
            "Condition": {
                "StringEquals": {
                    "ec2:ResourceTag/Owner": "deploybot"
                }
            },
            "Action": [
                "ec2:StopInstances",
                "ec2:RebootInstances",
                "ec2:TerminateInstances"
            ],
            "Resource": "*",
            "Effect": "Allow"
        },
        {
            "Condition": {
                "StringEquals": {
                    "ec2:CreateAction": "RunInstances"
                }
            },
            "Action": "ec2:CreateTags",
            "Resource": "*",
            "Effect": "Allow"
        }
    ]
}
  1. Replace ROOT_ACCOUNT_ID with ID of your Root AWS account and update the trust policy for your newly created role
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::ROOT_ACCOUNT_ID:root"
            },
            "Action": "sts:AssumeRole"
        }
    ]
}
  1. Replace ROLE_ARN with arn value from step 3 and attach this policy to your automation user (or group)
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": "sts:AssumeRole",
            "Resource": "ROLE_ARN",
            "Effect": "Allow"
        }
    ]
}

Configure workflow

Use the Advanced example in our main README file with the role ARN from above

Important Note: Make sure the Owner EC2 tags is set to the name of your automation user

Example:

[
  {"Key": "Owner", "Value": "JohnDone"}
]