Created
December 12, 2016 16:33
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Python Boto script that returns the number of AWS EC2 instances not covered by a Reserved Instance
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#!/usr/bin/env python3 | |
import boto3 | |
import json | |
def get_reserved_instances(client): | |
resp = {} | |
ris = client.describe_reserved_instances( | |
Filters=[{'Name': 'state', 'Values': ['active', ]}]) | |
for ri in ris['ReservedInstances']: | |
k = ri['InstanceType'] | |
try: | |
resp[k] += ri['InstanceCount'] | |
except: | |
resp[k] = ri['InstanceCount'] | |
return resp | |
def get_running_instances(client): | |
ins = {} | |
nt = None | |
_args = { | |
"Filters": [{'Name': 'instance-state-name', 'Values': ['running']}] | |
} | |
while True: | |
if nt: | |
_args['NextToken'] = nt | |
resp = client.describe_instances(**_args) | |
for r in resp['Reservations']: | |
for i in r['Instances']: | |
if 'SpotInstanceRequestId' in i: | |
continue | |
try: | |
ins[i['InstanceType']] += 1 | |
except: | |
ins[i['InstanceType']] = 1 | |
try: | |
nt = resp['NextToken'] | |
except: | |
break | |
return ins | |
def handler(event, context): | |
ec2 = boto3.client('ec2') | |
ris = get_reserved_instances(ec2) | |
ins = get_running_instances(ec2) | |
for ri, count in ris.items(): | |
ins[ri] -= count | |
return ins | |
if __name__ == "__main__": | |
print (json.dumps(handler({}, {}))) |
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