Lambda function Python 3.6 to shut off EC2 instance with specific tags

Question

Here is what I have so far. I just need help creating if statement/for loop for comparing tags. My tags are: Key: 'Name', Value: 'TestServer'. Thanks!

import boto3

ec2 = boto3.resource('ec2')
#tag = ec2.Tag('i-018b3ee8dd8b9fed3','Name','TestServer1')

region = 'us-east-1'
instances = ['i-018b3ee8dd8b9fes4']
ec2 = boto3.client('ec2')

def lambda_handler(event, context):
    
    ec2.stop_instances(InstanceIds=instances )
    print('stopped your instances: ' + str(instances) +str(tag))

FYI, I created a Simple EC2 Stopinator in Lambda - DEV Community that can stop/terminate instances based on tag. Feel free to use the code. — John Rotenstein
– John Rotenstein, Commented Feb 3, 2021 at 22:06
I tried but it does not seem to work could you post it down below :). I tried to create a JSON policy that would specify only to allow the stopping or starting based on certain tags but I need to filter out tags more specifically for tags I dont want etc.. — robby
– robby, Commented Feb 4, 2021 at 15:18
import boto3 region = 'us-east-1' ec2 = boto3.client('ec2') instances = ['i-018b3ee8dd8b9fes5'] def lambda_handler(event,context): ec2.stop_instances(InstanceIds=instances) — robby
– robby, Commented Feb 4, 2021 at 15:19
Thats what I have and it works. I have tried many different variations of filters, sorting by keys, etc.. and nothing seems to work. I am still sort of new so trying to learn but am getting upset when code that would normally work will not compile :( — robby
– robby, Commented Feb 4, 2021 at 15:20

samtoddler · Accepted Answer · 2021-02-04 16:40:05Z

1

Prepare a filter based on your tags requirement and run the query, eventually iterate through the resource.

import boto3
# Connect to EC2
ec2 = boto3.client('ec2', region_name='us-east-1')
 

def lambda_handler(event,context):
    custom_filter = [{
        'Name':'tag:Name', 
        'Values': ['TestServer']}]
    instances_to_stop = []
    running_instances = ec2.describe_instances(Filters=custom_filter)
    for reservation in running_instances.get('Reservations'):
        for instance in reservation.get('Instances'):
            instances_to_stop.append(instance.get('InstanceId'))
    print(f'Stopping following instance Ids : {instances_to_stop}')
    response = ec2.stop_instances(InstanceIds=instances_to_stop)
    print(response)

Response:

{
  "StoppingInstances": [
    {
      "CurrentState": {
        "Code": 64,
        "Name": "stopping"
      },
      "InstanceId": "i-011ac4a33afdsadasd",
      "PreviousState": {
        "Code": 16,
        "Name": "running"
      }
    }
  ],
  "ResponseMetadata": {
    "RequestId": "35a3ab",
      "date": "Thu, 04 Feb 2021 16:35:38 GMT",
      "server": "AmazonEC2"
    },
    "RetryAttempts": 0
  }
}

edited Feb 4, 2021 at 16:40

answered Feb 3, 2021 at 20:34

samtoddler

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13 Comments

robby Over a year ago

is that python 3.7 or 3.6 im using 3.6 and got some errors currently debugging and tidying up. Also, shouldn't the tag 'Name' field be Key??

robby Over a year ago

ec2.stop_instances*

samtoddler Over a year ago

@robby I just typed the code here, to give nudge you in the correct direction. When you prepare the filter you provide the tags in the above format. Like filters = [{'Name':'tag:environment', 'Values':[Env]}, {'Name':'tag:role', 'Values':[Role]} ]

robby Over a year ago

actually it says im not able to use filter parameter in ec2.stop_instances... :( thanks for the help! if you can think of anything else please let me know!

samtoddler Over a year ago

@robby stop_instances doesnt support custom filters. In my code above I am pasing Instances

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