CODEWITHSUNDEEP
pythonamazon-web-servicesamazon-ec2aws-lambda
Praveen Sivakumar
Praveen Sivakumar

Reputation: 61

I need to get Public IPv4 address on response of newly created instance by this Lambda Function?

I am creating a instance using boto3 and i want to print the public ip Address on response. please assist to complete this code but the code keep shows error can someone help to correct this code to show print public ipv4 address

import boto3
import json
 
AMI = 'AMI'
INSTANCE_TYPE = 'INSTANCE_TYPE'
KEY_NAME = 'KEY_NAME'
REGION = 'REGION'
SUBNET_ID = 'SUBNET_ID'
SECURITYGROUP_ID = 'SECURITYGROUP_ID'
 

def lambda_handler(event, context):

    ec2 = boto3.client('ec2', region_name=event['REGION'])

        
    instance = ec2.run_instances(
        ImageId=event['AMI'],
        InstanceType=event['INSTANCE_TYPE'],
        KeyName=event['KEY_NAME'],
        SubnetId=event['SUBNET_ID'],
        SecurityGroupIds = ['my-sg'],
        MaxCount=1,
        MinCount=1,
        InstanceInitiatedShutdownBehavior="terminate",
        TagSpecifications=[
        {
            'ResourceType': 'instance',
            'Tags': [
                {
                    'Key': 'Name',
                    'Value': 'my-instance'
                },
            ]
        },
    ],
    )
    print ("New instance created:")
    instance_id = instance['Instances'][0]['InstanceId']
    print (instance_id)
    
    for instance in instance:
    IP = instance.public_ip_address
    print(IP)
        
    return instance_id**

error message shown like this

errorMessage": "'str' object has no attribute 'public_ip_address'",

Upvotes: 0

Views: 322

Answers (1)

John Rotenstein
John Rotenstein

Reputation: 269530

The public IP address will not be provided after run_instances() because it takes a while to assign to the instance.

You should repeatedly call describe_instances() until a public IP address is provided. I would recommend waiting a few seconds between each call.

After calling:

response = describe_instances(InstanceIds=[instance_id])

you can check if a value is provided:

instance = response['Reservations'][0]['Instances'][0]

if 'PublicIpAddress' in instance:
    public_ip = instance['PublicIpAddress']

Upvotes: 2

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