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boto script to find and stop idle instances
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| import argparse | |
| import boto3 | |
| import datetime | |
| from dateutil.tz import tzutc | |
| def is_in_autoscale_group(region, instance_id): | |
| asg = boto3.client('autoscaling', region_name=region) | |
| instances = \ | |
| asg.describe_auto_scaling_instances(InstanceIds=[instance_id]) | |
| instance_status = instances['AutoScalingInstances'] | |
| if instance_status: | |
| print "Instance %s is in autoscale group %s" \ | |
| % (instance_id, instance_status[0]['AutoScalingGroupName']) | |
| return True | |
| return False | |
| def stop_idle_instances(region, tag_key, tag_values, | |
| idle_period_secs, minimum): | |
| ec2 = boto3.client('ec2', region_name=region) | |
| ec2res = boto3.resource('ec2', region_name=region) | |
| c = boto3.client('cloudwatch', region_name=region) | |
| values = tag_values.split(",") | |
| filters = [] | |
| if tag_key: | |
| f0 = {} | |
| f0['Name'] = "tag:{}".format(tag_key) | |
| f0['Values'] = values | |
| filters.append(f0) | |
| f1 = {} | |
| f1['Name'] = 'instance-state-name' | |
| f1['Values'] = ['running'] | |
| filters.append(f1) | |
| # print filters | |
| rs = ec2.describe_instances(Filters=filters) | |
| now = datetime.datetime.now(tzutc()) | |
| lookback = datetime.timedelta(seconds=idle_period_secs) | |
| time_start = now - lookback | |
| # print rs['Reservations'] | |
| for r in rs['Reservations']: | |
| for i in r['Instances']: | |
| launch_time = i['LaunchTime'] | |
| if is_in_autoscale_group(region, i['InstanceId']): | |
| continue | |
| age = now - launch_time | |
| if age < datetime.timedelta(seconds=idle_period_secs): | |
| print "Age of instance %s = %s, less than %s" %\ | |
| (i['InstanceId'], str(age), str(lookback)) | |
| continue | |
| dim = [{'Name': 'InstanceId', 'Value': i['InstanceId']}] | |
| period = idle_period_secs - (idle_period_secs % 60) | |
| if period < 60: | |
| period = 60 | |
| metric = c.get_metric_statistics(Period=period, | |
| StartTime=time_start, | |
| EndTime=now, | |
| MetricName='CPUUtilization', | |
| Namespace='AWS/EC2', | |
| Statistics=['Average'], | |
| Dimensions=dim) | |
| # print metric | |
| if metric['Datapoints']: | |
| average = metric['Datapoints'][0]['Average'] | |
| print "Average for %s is %f. Minimum is %f" \ | |
| % (i['InstanceId'], average, minimum) | |
| if average < minimum: | |
| print "About to stop instance %s" % i['InstanceId'] | |
| inst = ec2res.Instance(i['InstanceId']) | |
| inst.stop() | |
| if __name__ == "__main__": | |
| parser = argparse.ArgumentParser() | |
| parser.add_argument("--region", required=True, | |
| dest='region', default=None) | |
| parser.add_argument("--tag-key", required=False, | |
| dest='tag_key', default='instance-purpose') | |
| parser.add_argument("--tag-values", required=False, | |
| dest='tag_values', default='test') | |
| parser.add_argument("--idle-period-secs", required=False, | |
| dest='idle_period_secs', type=int, default=86400) | |
| parser.add_argument("--minimum-utilization", required=False, | |
| dest='minimum', type=float, default=0.05) | |
| result = parser.parse_args() | |
| stop_idle_instances(region=result.region, | |
| tag_key=result.tag_key, | |
| tag_values=result.tag_values, | |
| idle_period_secs=result.idle_period_secs, | |
| minimum=result.minimum) |
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