Optimize EC2 cost with Lambda > Create Lambda Function > Function stop instance

Function stop instance

Create a Lambda Function that executes Stop instances

Go to AWS Management Console

Find Lambda
Select Lambda

Create Lambda Function for Stop instance

In the AWS Lambda interface

Select Function
Select Create function

Create Lambda Function for Stop instance

In the Create function interface

Select Author from scratch
Function name, enter dc-common-lambda-auto-stop
Runtime, select Python 3.8
Select x86_64

Create Lambda Function for Stop instance

Continue in Create function interface

Select Change default execution role
Select Use an existing role
Select dc-common-lambda-role
Select Create function

Create Lambda Function for Stop instance

After creating the function successfully

Select Configuration
Select Environment variables
Select Edit

Create Lambda Function for Stop instance

In the Edit environment variables interface

Select Add environment variable

Create Lambda Function for Stop instance

In the Edit environment variables interface

Key, enter environment_auto
Value, enter true

Create Lambda Function for Stop instance

After creating the environment

We choose Code

Create Lambda Function for Stop instance

In the Code source interface

Import source code: You need to change webhook_url to receive notifications to Slack.

import boto3
import os
import json
import urllib3

ec2_resource = boto3.resource('ec2')
http = urllib3.PoolManager()
webhook_url = "https://hooks.slack.com/services/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"

def lambda_handler(event, context):
    environment_auto= os.environ.get('environment_auto')
    if not environment_auto:
        print('Target is empty')
    else:
        instances = ec2_resource.instances.filter(
            Filters=[{'Name': 'tag:environment_auto', 'Values': [environment_auto]}]
        )     
        if not list(instances):
            response = {
                "statusCode":500,
                "body": "Target Instance is None"
            }
        else:
            action_stop = instances.stop()
            sent_slack(action_stop)
            response = {
                "statusCode":200,
                "body": "EC2 Stopping"
            }
        return response


def sent_slack(action_stop):
    list_instance_id = []
    if (len(action_stop)>0) and ("StoppingInstances" in action_stop[0]) and (len(action_stop[0]["StoppingInstances"])>0):
        for i in action_stop[0]["StoppingInstances"] :
            list_instance_id.append(i["InstanceId"])
            msg = "Stopping Instances ID:\n %s" %(list_instance_id)
            data = {"text":msg}
            r = http.request("POST",
                webhook_url,
                body = json.dumps(data),
                headers = {"Content-Type":"application/json"})
    else:
        print ('Not found Instances Stop')

Create Lambda Function for Stop instance

Then save and select Deploy

Create Lambda Function for Stop instance

Go to AWS Management Console

Find CloudWatch
Select CloudWatch

Create Lambda Function for Stop instance

In the CloudWatch interface

Select Events
Select Rules
Select Go to Amazon EvenBridge

Create Lambda Function for Stop instance

In the Rules interface

Select Create rule

Create Lambda Function for Stop instance

In the create rule interface

Name, enter dc-common-lambda-auto-stop
Description, enter dc-common-lambda-auto-stop
Select Schedule
Select Next

Create Lambda Function for Stop instance

In Schedule pattern

There are 2 Schedule patterns to choose from:

A detailed schedule that runs at a specific time, such as 8am PST on the first Monday of each month.
Schedule runs at a regular pace, such as every 10 minutes

Select A schedule that runs at a regular rate, such as every 10 minutes.
Set rate, value is 9 hours
Select Next

Create Lambda Function for Stop instance

In the Target interface

Select AWS service
Select Lambda function
Function, select dc-common-lamda-auto-stop
Select Next

Create Lambda Function for Stop instance

Select Next

Create Lambda Function for Stop instance

Check again and select Create rule

Create Lambda Function for Stop instance

Complete rule creation for stop instance

Create Lambda Function for Stop instance