This script creates  an AMI of each running instance, tags them with a datestamp, copies them to a disaster recovery region, and trims images that are 7 days old. This script needs some refactoring, but works at the moment. I think I would like to decouple it a bit so that the sleep timers can be removed.

#!/usr/bin/python

import boto3
import botocore
from datetime import datetime, timedelta
from time import sleep
import re

# variables

local_region = 'us-west-2'
dr_region = 'us-east-1'

current_date = datetime.now().today()
last_week = current_date - timedelta(days=7)
current_date_tag = str(current_date.strftime("%Y-%m-%d"))
last_week_date_tag = str(last_week.strftime("%Y-%m-%d"))

local_ami_list = []
dr_ami_list = []
ami_list_to_copy = []

ec2_local = boto3.client('ec2', region_name=local_region)
ec2_dr = boto3.client('ec2', region_name=dr_region)


# 1. pull list of running instances in us-west-2

try:
    local_instances = ec2_local.describe_instances()
    for key in local_instances['Reservations']:
        for instance in key['Instances']:
            if instance['State']['Name'] == 'running':
                local_instance_id = instance['InstanceId']
                local_instance_tags= instance['Tags'][0]
                local_instance_name = str(local_instance_tags.get('Value'))
                entry = local_instance_id + ',' + local_instance_name
                local_ami_list.append(entry)
            else:
                pass

except botocore.exceptions.ClientError as error:
    print('error: {0}'.format(error))


# 2. Creates an AMI of each instance and tags it with the current date and name

for line in local_ami_list:
    image_data_combined_list = line.split(',')
    #pprint(image_data_combined_list)
    local_instance_id = image_data_combined_list[0]
    local_instance_name = current_date_tag + '-' + image_data_combined_list[1]
    image = ec2_local.create_image(InstanceId=local_instance_id, Description=local_instance_name, DryRun=False,
                                   Name = local_instance_name, NoReboot=True)

    entry = local_instance_name + ',' + image['ImageId']
    ami_list_to_copy.append(entry)

sleep(90)


# 3. Copies the AMIs to the DR region us-east-1

for line in ami_list_to_copy:
    ami_list_combined_data = line.split(',')
    local_ami_name = ami_list_combined_data[0]
    local_ami_id = ami_list_combined_data[1]
    try:
        image_copy = ec2_dr.copy_image(Description=local_ami_name, Name=local_ami_name, SourceImageId=local_ami_id,
                                       SourceRegion=local_region, DryRun=False)
        entry = local_ami_name + ',' + image_copy['ImageId']
        dr_ami_list.append(entry)

    except botocore.exceptions.ClientError as error:
        print('error: {0}'.format(error))

sleep(90)


# 4. Pulls a list of current private AMIs in us-west-2 and drops AMIs that are tagged 7 days older

local_amis_to_prune = ec2_local.describe_images(Owners=['self'])
local_amis = local_amis_to_prune['Images']
for ami in local_amis:
    entry = str(ami['Name']) + ',' + str(ami['ImageId'])
    match = re.search(last_week_date_tag,entry)
    if match:
        ec2_local.deregister_image(ImageId=ami['ImageId'])
        #print('deleting: ', ami['Name'])
    else:
        pass
        #print('not deleting', ami['Name'])

# 5. same for dr region

remote_amis_to_prune = ec2_dr.describe_images(Owners=['self'])
remote_amis = remote_amis_to_prune['Images']
for ami in remote_amis:
    entry = str(ami['Name']) + ',' + str(ami['ImageId'])
    match = re.search(last_week_date_tag,entry)
    if match:
        ec2_dr.deregister_image(ImageId=ami['ImageId'])
        #print('deleting: ', ami['Name'])
    else:
        pass
        #print('not deleting', ami['Name'])