AWS Lambda function that will stop and eventually terminate instances that have packer keys attached to them .

PurgeOrphanedPacker.py

#!/usr/bin/env python3

import datetime
import pytz
import boto3

def lambda_handler(event, context):

    TerminateDelayDays = 3
    StopDelayDays = 1

    Targets       = []
    PackerRunning = []
    PackerStopped = []
    PackerSpot    = []
    DateTimeNow   = datetime.datetime.now(pytz.utc)
    LaunchAge     = None
    ec2_client    = boto3.client("ec2")
    response      = ec2_client.describe_instances()

    for records in response["Reservations"]:
        for record in records["Instances"]:
            KeyName = "None"
            if record["State"]["Name"] != "terminated":
                State      = record["State"]["Name"]
                LaunchTime = record["LaunchTime"]
                InstanceId = record["InstanceId"]
                LaunchAge  = DateTimeNow - LaunchTime
                if record.get("InstanceLifecycle") != None:
                    InstanceType = record["InstanceLifecycle"]
                else:
                    InstanceType = "normal"

                if record.get("KeyName") != None:
                    KeyName = record["KeyName"]
                else:
                    KeyName = "NoKey"

            if (LaunchAge != None
                and LaunchAge.days > StopDelayDays
                and State != "terminated"
                and KeyName.startswith("packer_")):

                Targets.append({
                    "KeyName":    KeyName,
                    "State":      State,
                    "InstanceId": InstanceId,
                    "InstanceType": InstanceType,
                    "LaunchAge":  LaunchAge.days
                })

    print("Looking for Orphan Packer Instances")

    for Target in Targets:
        print(
        "Handling:",
        Target["InstanceId"],
        Target["State"],
        Target["InstanceType"],
        Target["KeyName"],
        Target["LaunchAge"],"Days Old"
        )

        if Target["State"] == "running" and Target["InstanceType"] == 'spot':
            PackerSpot.append(Target["InstanceId"])

        if Target["State"] == "running" and Target["InstanceType"] != 'spot':
            PackerRunning.append(Target["InstanceId"])

        if Target["State"] == "stopped" and Target["LaunchAge"] > TerminateDelayDays:
            PackerStopped.append(Target["InstanceId"])

    if len(PackerSpot) > 0:
        print("Terminateing Spots:",PackerSpot)
        ec2_client.terminate_instances(InstanceIds=PackerSpot)

    if len(PackerRunning) > 0:
        print("Stopping:",PackerRunning)
        ec2_client.stop_instances(InstanceIds=PackerRunning)

    if len(PackerStopped) > 0:
        print("Terminateing:",PackerStopped)
        ec2_client.terminate_instances(InstanceIds=PackerStopped)

    if (len(PackerStopped) == 0
        and len(PackerRunning) == 0
        and len(PackerSpot) == 0):
        print("No old Packer Instances found, no action taken.")

    print("Done")

    return {
        "message" : "Completed"
    }