A short sweet Python script to simplify starting/stopping a particular ec2 instance

toggle

#!/usr/bin/env python3
""" toggle

    Usage:

        toggle start
        toggle getip
        toggle stop
"""


# ______________________________________________________________________
# Imports

import sys

import boto3


# ______________________________________________________________________
# Globals

INSTANCE_NAME = 'YOUR_INSTANCE_NAME'
REGION = 'YOUR_REGION'


# ______________________________________________________________________
# Main

if __name__ == '__main__':

    if len(sys.argv) < 2:
        print(__doc__)
        sys.exit(0)

    action = sys.argv[1]
    if action not in ['start', 'stop', 'getip']:
        print(__doc__)
        sys.exit(0)

    # Create an ec2 client
    ec2 = boto3.client(
        'ec2',
        region_name = REGION
    )

    # Get a list of instances we might care about.
    target_state = 'stopped' if action == 'start' else 'running'
    stopped_instances = ec2.describe_instances(
        Filters=[ {
            'Name': 'instance-state-name',
            'Values': [target_state]
        } ]
    )

    instance_id = None
    for instance in stopped_instances['Reservations']:
        for i in instance['Instances']:
            for tag in i['Tags']:
                if tag['Key'] == 'Name' and tag['Value'] == INSTANCE_NAME:
                    instance_id = i['InstanceId']
                    if action == 'getip':
                        public_ip = i['PublicIpAddress']

    if instance_id is None:
        print(f'Ruh-roh, I couldn\'t find the instance_id for', INSTANCE_NAME)
        sys.exit(0)

    if action == 'start':
        ec2.start_instances(InstanceIds=[instance_id])
    elif action == 'stop':
        ec2.stop_instances(InstanceIds=[instance_id])
    else:
        print(public_ip)