CODEWITHSUNDEEP
pythonamazon-web-servicesaws-lambdaboto3
Aman
Aman

Reputation: 13

Lambda Script to get instances name which are not having a particular tag

For test purpose i am having 3 instances , 2 have tag in them key:Backup Value:Testing and 1 is without this i want to get the instance name which is not having this particular tag. I am trying this logic that i am getting all the instance name and then finding which instances having this backup tag and then removing the 2nd list from 1st. i am able to get both the list but not able to filter out the 2nd list from the first.

Code:

import boto3

ec2 = boto3.client('ec2')

def lambda_handler(event, context):
    response = ec2.describe_instances()
    for reservation in response["Reservations"]:
        for instance in reservation["Instances"]:

            print(instance["InstanceId"])


    tags_NV = ec2.describe_tags(
    Filters = [
        {
            'Name':'resource-type',
            'Values':['instance']
        },
        {
        'Name':'key',
        'Values':['Backup']
        }
    ]
    )

    ami_backuppolicy = {i['ResourceId'] for i in tags_NV['Tags']}
    print(ami_backuppolicy)

OUTPUT: 

Function Logs:
START RequestId: c271c3b3-9c64-4d7b-829f-d34ffcb5e944 Version: $LATEST

i-05a448daa5823d6af
i-0f79ec69714932e8e
i-058bfa970112e8565

{'i-058bfa970112e8565', 'i-05a448daa5823d6af'}

END RequestId: c271c3b3-9c64-4d7b-829f-d34ffcb5e944
REPORT RequestId: c271c3b3-9c64-4d7b-829f-d34ffcb5e944  Duration: 480.40 ms Billed Duration: 500 ms Memory Size: 128 MB Max Memory Used: 73 MB  Init Duration: 276.17 ms

Upvotes: 0

Views: 1692

Answers (2)

John Rotenstein
John Rotenstein

Reputation: 270184

Here is an AWS Lambda function that will find any instances that do not have the given tag:

import boto3

def lambda_handler(event, context):

    ec2_resource = boto3.resource('ec2')

    not_backed_up = []

    for instance in ec2_resource.instances.all():
        if not [tag for tag in instance.tags if tag['Key'] == 'Backup' and tag['Value'] == 'Testing']:
            not_backed_up.append(instance.id)

    print(not_backed_up)

Upvotes: 1

Aman
Aman

Reputation: 13

CODE :

import boto3
def lambda_handler(event, context):
    list=[]
    ec2 = boto3.client('ec2')
    ec2_resource = boto3.resource('ec2')
    response = ec2.describe_instances()
    for reservation in response["Reservations"]:
        for instance in reservation["Instances"]:

            list.append(instance["InstanceId"])

    not_backed_up = []
    list_difference = []
    for instance in ec2_resource.instances.all():
        if [tag for tag in instance.tags if tag['Key'] == 'Backup' and tag['Value'] == 'Testing']:
            not_backed_up.append(instance.id)

    print(list)
    print(not_backed_up)

    for item in list:
        if item not in not_backed_up:
         list_difference.append(item)

    print(list_difference)

OUTPUT :

Function Logs: START RequestId: 73fcb1b0-5421-47dc-88f6-b82f581aa461 Version: $LATEST

['i-05a448daa5823d6af', 'i-0f79ec69714932e8e', 'i-058bfa970112e8565']

['i-05a448daa5823d6af', 'i-058bfa970112e8565']

['i-0f79ec69714932e8e']

The 3rd output is the instance not having the backup tag

Upvotes: 0

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