aws-organization-ec2-list

Custom script that allows you to query all the EC2 instances within an AWS organization.

Requirements

In order to make the API calls in each account, you will need a role that your user can assume deployed at the organization level -- e.g. OrganizationEc2ReadRole. This role must have read permissions for EC2:

• AWS Managed policy

arn:aws:iam::aws:policy/AmazonEC2ReadOnlyAccess

• Custom policy

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

Additionally, this same role will need organization permissions in the master Organization account, so we are able to automatically retrieve all the accounts IDs within our Org. This will be useful as our organization might grow in the future. You can use the AWS managed policy:

arn:aws:iam::aws:policy/AWSOrganizationsReadOnlyAccess

Usage

• Clone the repo locally

git clone https://github.com/FlorianValery/aws-organization-ec2-list.git

• Update the config/default.json file with the proper region, master account ID and cross-accounts role that your user can assume

{
  "Region": "us-east-1",
  "OrganizationRole": "OrganizationEc2ReadRole",
  "MasterAccountID": "000000000000"
}

• Export your AWS credentials using the CLI or tools like Awsume

awsume master-role

• Build the script package and run it

go build -o app
./app

Output example in a csv file

Account Name,Account ID,Instance Name,Instance Size,Instance ID,Image ID,Platform,Private IP,State,Timestamp
account-prod,000000000000,awesome_app,t3.micro,i-00000000000000aa,ami-000000000000aa,linux,10.0.0.1,running,2021-01-18 00:00:00 +0000 UTC
account-prod,000000000000,awesome_app,t3.micro,i-11111111111111bb,ami-11111111111111bb,linux,10.100.0.0,running,2021-12-18 100:00:00 +0000 UTC
account-staging,111111111111,awesome_db,t3.micro,i-11111111111111cc,ami-11111111111111cc,linux,10.10.0.1,running,2021-01-18 00:00:00 +0000 UTC
[...]

This repo is used as the source code for this complete guide