Need to receive emails when someone creates an EC2 instance in AWS. I have tried using cloudwatch but that doesn't seem to work for me. It says insufficient data. Is there a better way to do it?
Step1 : Create a Cloud watch Rule to notifiy the creation . As per the lifecycle of EC2 Instance when lauch button is pressed . Instance goes from Pending state to Running state . So create the Rule for Pending state
Create a Cloud watch Rule as specified in the image screenshot
Step2 : Create a Step function . Because cloud Trail logs all the event in the account with a delay of atleast 20 min . This step function is usefull if you want the name of user who has created the instance .
{
"StartAt": "Wait",
"States": {
"Wait": {
"Type": "Wait",
"Seconds": 1800,
"Next": "Ec2-Alert"
},
"Ec2-Alert":{
"Type": "Task",
"Resource":"arn:aws:lambda:ap-south-1:321039853697:function:EC2-Creation-Alert",
"End": true
}
}
}
Step3 : Create a SNS topic for notification
Step4 : Write a lambda function to fetch the log from cloud trail and get the user name who has created the instance .
import json
import os
import subprocess
import boto3
def lambda_handler(event, context):
client = boto3.client('cloudtrail')
client1 = boto3.client('sns')
Instance=event["detail"]["instance-id"]
response = client.lookup_events(
LookupAttributes=[
{
'AttributeKey': 'ResourceName',
'AttributeValue': Instance
},
],
MaxResults=1)
test=response['Events']
st="".join(str(x) for x in test)
print(st)
user=st.split("Username")[1]
finalname=user.split(",")
Creator=finalname[0]
#print(st[st.find("Username")])
Email= "Hi All ,\n\n\n The User%s has created new EC2-Instance in QA account and the Instance id is %s \n\n\n Thank you \n\n\n Regard's lamda"%(Creator,Instance)
response = client1.publish(
TopicArn='arn:aws:sns:ap-south-1:321039853697:Ec2-Creation-Alert',
Message=Email
)
# TODO implement
return {
'statusCode': 200,
}
Note: This code trigger an notification if the instance is changed from stop state to running state.