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@adhorn
Created June 9, 2020 14:34
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Randomly stopping instance via AWS Lambda
import boto3
import random
import time
def stop_random_instance(ec2_client, az_name, tag):
paginator = ec2_client.get_paginator('describe_instances')
pages = paginator.paginate(
Filters=[
{
"Name": "availability-zone",
"Values": [
az_name
]
},
{
"Name": "tag:" + tag.split(':')[0],
"Values": [
tag.split(':')[1]
]
},
{
"Name": "instance-state-name",
"Values": [
"running"
]
}
]
)
instance_list = []
for page in pages:
for reservation in page['Reservations']:
for instance in reservation['Instances']:
instance_list.append(instance['InstanceId'])
print("Going to stop ANY of these instance %s ", instance_list)
if len(instance_list) > 0:
selected_instance = random.choice(instance_list)
print("Randomly selected %s", selected_instance)
ec2_client.stop_instances(
InstanceIds=[selected_instance]
)
return selected_instance
else:
print(
"No instance in running state in %s with tag %s",
az_name, tag)
def rollback(ec2_client, instance_id):
print('Restarting the instance %s', instance_id)
ec2_client.start_instances(
InstanceIds=[instance_id]
)
def run(az_name, tag, duration=60, log_level='INFO'):
print('Setting up ec2 client')
ec2_client = boto3.client('ec2')
instance_id = stop_random_instance(
ec2_client, az_name, tag)
if instance_id and duration:
print('Attempting to rollback')
time.sleep(duration)
rollback(ec2_client, instance_id)
def entry_point(event, context):
print("Event received: %s ", event)
run(
event["availabilityZone"],
event["tagValue"]
)
return {
"message": "Random instance stopped!",
"input": event
}
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