CODEWITHSUNDEEP
pythonamazon-ec2aws-lambdaaws-sdk
Yvanne
Yvanne

Reputation: 27

Inverse search in AWS Lambda using Python

I'm trying to get all instances that are not attached to an autoscaling group. All instances from an autoscaling group have a tag aws:autoscaling:groupName. I can get those instances with this: 

reservations = ec.describe_instances(
    Filters=[
        # Instances in autoscaling group
        {'Name': 'tag-key', 'Values': ['aws:autoscaling:groupName']},
        # Instances should be in running mode
        {'Name': 'instance-state-name', 'Values': ['running']}
    ]
).get(
    'Reservations', []
)

instances = sum(
[
    [i for i in r['Instances']]
    for r in reservations
], [])

print "Number of the instances in autoscaling: %d" % len(instances)

But what I really need to get are instances that are not in autoscaling. As there is an inverse search in AWS Console, I'm hoping there is in Python as well.

Upvotes: 1

Views: 422

Answers (1)

Bijohn Vincent
Bijohn Vincent

Reputation: 108

Following code can do it for you. There is no direct inverse search option in boto till date. Hope someday, someone will add that option :)

https://github.com/boto/boto3/issues/173

reservations = ec.describe_instances(
    Filters=[
        # Instances should be in running mode
        {'Name': 'instance-state-name', 'Values': ['running']}
    ]
)

Count=0
for Instances in reservations['Reservations']:
    for Instance in Instances['Instances']:
        if "aws:autoscaling:groupName" not in str(Instance):
            # your logic on servers without AutoScaling Group goes here
            Count=Count+1

print "Number of the instances Without autoscaling: ", Count

Upvotes: 1

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