Lambda Function: Multitasking feature in Cloud computing

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Scenario :-  Zedtel organization have 1000+ virtual machines in different region. company’s security team found some vulnerability. To prevent outside DDos attack Company security team require to perform eventful security task at a time with timid timeline globally at different Machines at different zone. How’s it possible if single VM manually takes 10 minutes to perform operation. So, how can complete it asap??

In this scenario Lambda function role is crucial to execute this task.

It is a serverless service to run code without provisioning any instance.

Characteristics of Lambda Function: - 

LAMBDA function has some important characteristics:

1.      No server management
2.      Flexible scaling
3.      No ideal capacity
4.      High availability


Lambda Function Execution Cycle:-



                        Figure 1 :  Five stage execution cycle of Lambda Function 

Step-1 : Create 2 EC2 instance with different availability Zone

 

Payment Gateway WEB 01 EC2 instance via launch instance. 



Payment Gateway WEB 02 EC2 instance via launch instance. 



Step-2 start both instances also 1 snapshot require which is after start instance .

 

One snapshot is already there which details is mentioned here.



Step-3 select IAM service create new role  for AWS service .




select permissions appropriately with EC2 service /EBS wise for IAM user.


Step -4 Create role and apply it.



Step-5 apply script which we want to run under lambda function. Choose option which language platform we used to run script.


Step-6 Apply code source in Editor mode.


Step-7 configuration require to run code Generally Memory size depends on Program code and how many Virtual Machine at a time performing this operation.




Step-8 Test and Run code after test event.



Application :

1.      People use photo share application to upload photos, application stores user photos in S3 bucket. In this scenario, it automatically generates a thumbnail. Lambda function code can read the photo object from bucket, create thumbnail version and save it in bucket.

2.      Suppose customer have a custom mobile application, customer can configure a Lambda function to process within application.

Run Program :

-        Use of memory and CPU power are proportionate to Lambda.

-        TTL = Maximum amount of time in which program must be completed.

Note: If we allocate TTL = 40 second, then please find output of sample code in Python3.8 as above. 

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