Get AMIs used by all EC2s in an account

README.md

Get AMIs used by all EC2s in an account

Example output:

{
    "ami-123redacted": {
        "id": "ami-123redacted",
        "name": "The name of the AMI",
        "instances": {
            "us-east-1": [
                "i-123redacted"
            ],
            "us-east-2": [
                "i-456redacted"
            ]
        }
    },
    "ami-456redacted": {
        "id": "ami-456redacted",
        "name": "The name of the AMI",
        "instances": {
            "us-east-1": [
                "i-789redacted"
            ]
        }
    }
}

ami_search.py

import boto3
import json

ret = {}

def get_ec2_regions():
    client = boto3.client('ec2')
    return [r['RegionName'] for r in client.describe_regions()['Regions']]

def append(ec2, image_id, instance_id, region):
    if image_id not in ret:
        image = ec2.Image(image_id)
        ret[image_id] = {
            "id": image_id,
            "name": image.name,
            "instances": {}
        }
    if region not in ret[image_id]['instances']:
        ret[image_id]['instances'][region] = []
    ret[image_id]['instances'][region].append(instance_id)

def get_ec2_images(region):
    ec2 = boto3.resource('ec2', region)
    instances = ec2.instances.all()

    for instance in instances:
        append(ec2, instance.image_id, instance.instance_id, region)


for region in get_ec2_regions():
    get_ec2_images(region)

print(json.dumps(ret))