Control AWS Lambda source IP - amazon-web-services

Question

I have a simple Lambda function the its job is to make HTTP GET to a certain server.
I need to run many copies (hundreds) of the function at the same time and I want to have a distinct source IP address for each HTTP GET coming from each Lambda.
My questions:
How do I make sure that each 'copy' of the Lambda function will have its own IP address?
How do I use boto API invoke call in order to tell AWS that I need N concurrent copies of my Lambda? I am looking here but I can not find the argument that sets the number of concurrent copies.
Thanks
Avishay
As for question #2 I am using the following code in order to invoke N concurrent copies of the Lambda function.
import boto3, json
from concurrent.futures import ThreadPoolExecutor
N = 5
unique_ips = set()
lambda_client = boto3.client('lambda', region_name='us-west-2')
def _lambda_caller(idx):
test_event = dict(idx=idx)
res = lambda_client.invoke(
FunctionName='SimpleHTTPGetter',
InvocationType='RequestResponse',
Payload=json.dumps(test_event),
)
data = json.loads(res['Payload']._raw_stream.data)
print('Thread {} is done'.format(idx))
unique_ips.add(data['body'])
with ThreadPoolExecutor(max_workers=N) as executor:
for i in range(0,N):
future = executor.submit(_lambda_caller,i)
executor.shutdown()
print('Done')
My Lambda code (short version)
import json
import socket
def lambda_handler(event, context):
print('-- HTTP Client started')
hostname = socket.gethostname()
ip = socket.gethostbyname(hostname)
print('My IP address is {}:'.format(ip))
return {
"statusCode": 200,
"body": ip
}

Answer 1

You need to create a VPC, Make sure you attach a subnet that allows internet access. And then attach a security policy to your lambda.
Step by Step here:
https://medium.com/#philippholly/aws-lambda-enable-outgoing-internet-access-within-vpc-8dd250e11e12