AWS Lambda Tutorial | A Guide to Creating Your First Function
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AWS Lambda Tutorial | A Guide to Creating Your First Function

Last updated on 20th Jan 2022, Blog, General

About author

Bhupinder Pal (Sr. AWS lambda Developer )

Bhupinder Pal is an industry expert and subject specialist who has experience with AWS Services (Lambda, API Gateway, S3, SNS). He is a certified professional with 7+ years of experience in their respective domains.

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    • Introduction to AWS Lambda
    • Prerequisites
    • Where will I use AWS Lambda?
    • So, how does it work?
    • Why not EC2?
    • What Is A Lambda Function In AWS?
    • What Triggers AWS Lambda Functions?
    • How Programming Languages Treats Lambda Support?
    • AWS Lambda Vs. EC2: How They Compare
    • AWS Lambda Use Cases: When Should You Use AWS Lambda?
    • AWS Lambda Pricing Explained: How Does The Pay-As-You-Go Pricing Work?
    • Step by step instructions to work out AWS Lambda costs
    • How To Monitor And Measure Lambda Costs
    • Constraints of AWS Lambda
    • Conclusion of SAP Fiori

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      Introduction to AWS Lambda:

      AWS Lambda is an assistant which registers the code with no server. It is supposed to be the serverless figure. The code is executed in light of the reaction of occasions in AWS administrations, for example, adding/eliminating documents in the S3 container, refreshing Amazon DynamoDB tables, HTTP demand from Amazon API Gateway, and so on.


      This tutorial is intended for programming software engineers who need to become familiar with the essentials of AWS Lambda and its customizing ideas in a basic and simple manner. This instructional exercise will give you enough comprehension of the different functionalities of AWS Services to be utilized with AWS Lambda with illustrative models.


      To work with AWS Lambda, you want a login in AWS. The subtleties on the most proficient method to get free login is talked about in instructional exercise. AWS Lambda upholds dialects like NodeJS, Java, Python, C#, and Go. If you are an amateur to any of these advancements, we propose you go through instructional exercises connected with these before continuing with this instructional exercise.

      Where will I use AWS Lambda?

      AWS Lambda executes your backend code, consequently dealing with the AWS assets. At the point when we say ‘make due’, it incorporates sending off or ending examples, wellbeing tests, auto-scaling, refreshing or fixing new updates, and so forth.

      So, how does it work?

      The code that you need Lambda to run is known as Lambda work. Presently, as we probably are aware a capacity runs just when it is called, correct? Here, Event Source is the element that triggers a Lambda Function, and afterward, the errand is executed.

      How about we take a guide to comprehend it all the more obviously.

      Assume you have an application for pictures transferring. Presently when you transfer a picture, there are a ton of errands required before putting away it, for example, resizing, applying channels, pressure, and so on. Thus, this errand of transferring a picture can be characterized as an Event Source or the ‘trigger’ that will call the Lambda Function, and afterward, this large number of assignments can be executed using the Lambda work. In this model, a designer simply needs to characterize the occasion source and transfer the code. We should comprehend this model with genuine AWS assets now. Here we will transfer pictures as objects to an S3 container. This transferring a picture to the S3 container will turn into an occasion source or the ‘trigger’. The entire interaction, as you can find in the graph, is separated into 5 stages, we should see every last one of them.

    • The client transfers a picture (object) to a source container in S3 which has a warning connected to it, for Lambda.
    • The notice is perused by S3 and it chooses where to send that warning.
    • S3 sends the warning to Lambda, this notice goes about as a conjure call of the lambda work.
    • The execution job in Lambda can be characterized by utilizing IAM (Identity and Access Management) to give access authorization for the AWS assets, for this model here it would be S3.

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      At last, it summons the ideal lambda work which deals with the item which has been transferred to the S3 can. If you somehow happened to settle this situation customarily, alongside improvement, you would have recruited individuals for dealing with the accompanying errands:

    • Size, arrangement, and scale-up gathering of servers
    • Overseeing OS refreshes
    • Apply security patches and
    • Screen this framework for execution and accessibility.

    • This would have been a costly, monotonous, and tedious errand, subsequently, the requirement for AWS Lambda is advocated. AWS Lambda is viable with Node.JS, Python, and Java, so you can transfer your document in a zip, characterize an occasion source and you are set!

      Why not EC2?

      1. If you somehow happened to utilize EC2, you would need to engineer everything for the example load balancer, EBS volumes, programming stacks, and so on In lambda, you don’t need to stress over anything, simply embed your code, and AWS will deal with the rest!

      2. For instance, in EC2 you would introduce the product bundles on your virtual machine which would uphold your code, yet in Lambda you don’t need to stress over any VM, simply embed plain code and Lambda will execute it for you.

      3. However, assuming that your code will be running for quite a long time, and you expect a ceaseless stream of solicitations, you ought to likely go with EC2, because the design of Lambda is for an irregular sort of responsibility, wherein there will be a few calm hours and a few spikes in the no. of solicitations too.

      4. For instance, logging the email action for say a little organization, would see more action during the day than in the evening, additionally, there could be days when there are fewer messages to be handled, and in some cases, the entire world could begin messaging you! In both cases, Lambda is at your administration.

      5. Taking into account this utilization case for a major person-to-person communication organization, where the messages are ceaseless because it has a gigantic client base, Lambda may not be the able decision. You can peruse more with regards to EC2 AWS here for a more profound arrangement.

      What Is A Lambda Function In AWS?

      a) A Lambda work is the code you run in AWS Lambda.

      b) How would you do that?

      c) While you don’t have to, make certain to compose the code in a stateless style. That implies composing code in a manner that expects there is no partiality to the basic AWS Lambda foundation.

      d) You can make, call, and oversee Lambda capacities utilizing these five connection points:

      e) AWS Management Console

      f) AWS CloudFormation

      g) AWS Serverless Application Models (SAM)

      h) AWS SDKs

      e) AWS Command Line Interface

      Things being what they are, the reason must you utilize stateless code for AWS Lambda?

      AWS Lambda just permits you to produce however many capacity duplicates as the rate at which occasions are coming in. That further develops versatility and execution while keeping costs sensibly low. Notwithstanding, Lambda will allow you to get stateful information when you call other web-accessible administrations like Amazon DynamoDB and Amazon S3.

      What’s in a Lambda work?

    • AWS Lambda capacities into autonomous holders when you utilize the Serverless Application Model (SAM) for your code.
    • The Lambda work is typically a compartment since it involves design data that connects with that capacity. That data incorporates the capacity name and depiction, asset prerequisites, and passage point.
    • Credit: Serverless-stack.

      That is simply the data a capacity uses to execute itself when set off.

      What Triggers AWS Lambda Functions?

      As referenced before, numerous occasion sources can trigger Lambda capacities (make Lambda run your code). For instance, you can trigger a Lambda work by refreshing tables in Amazon DynamoDB, changing an article in Amazon S3, parsing HTTP demands through Amazon API Gateway, or streaming information through serverless handling with Amazon Kinesis. More Lambda work triggers include:

    • CloudFront
    • SQS
    • Alexa Smart Home
    • SNS
    • AWS IoT
    • CloudWatch Events (and Logs)
    • Application Load Balancer

    • How Programming Languages Treats Lambda Support?

      AWS upholds the accompanying dialects locally:

      1. Node.js (14, 12) with Amazon Linux 2 OS

      2. Python (3.6, 3.7) with Amazon Linux and (3.8) with Amazon Linux 2 OS

      3. Go Runtimes (1. x) with Amazon Linux 2 OS

      4. C# runtimes (.NET Core 3.1) with Amazon Linux 2

      5. Ruby 2.7 with Amazon Linux 2 OS

      6. Java 8 with Amazon Linux OS

      7. Java 8 (Java8.la2) and Java 11 with Amazon Linux 2 OS

      8. Custom Runtime (gave al2 and gave) with Amazon Linux 2 and Amazon Linux, individually. So you can give any Docker Container Image as a custom runtime.

      9. Likewise, AWS gives a Runtime API you can use to compose your code in extra dialects. AWS keeps up with the runtimes, giving Amazon Linux and Linux 2 conditions to run them in.

      AWS Lambda Vs. EC2: How They Compare:

    • Assuming that you are thinking about Lambda versus Amazon EC2, here’s a fast correlation.
    • Lambda is a completely overseen serverless processing administration where you just need to transfer and run your code to begin.
    • EC2 contrasts that by utilizing cloud-based virtual machines (VMs) engineering. So EC2 will allow you to control or redo cases, arrangement limit, working framework, network apparatuses, and change the hidden foundation to further develop angles like security. That is assuming you have experience taking care of those obligations.
    • With EC2, you can move existing applications to the cloud all the more quickly because you don’t need to change their engineering excessively. You can rather change the EC2 framework to help the application.
    • However, on the off chance that you don’t have the experience, financial plan, and time to swim in a pool of specialized liabilities, Lambda gives a made due, promptly accessible, exceptionally versatile, and assuringly secure serverless figuring stage.
    • You will not approach its foundation because AWS handles everything for your benefit.
    • Lambda additionally just runs in light of a trigger known as an occasion. It doesn’t run day in and day out, dissimilar to other Platform-as-a-Service (PaaS) contributions. That makes it savvier because AWS charges you for just the assets you use.

    • AWS Lambda Use Cases: When Should You Use AWS Lambda?

      Presently you realize the reason why you’d need to deal with your AWS occurrences with Lambda rather than EC2. So the following are a few strong AWS Lambda highlights and how to utilize them.

      a) Exploit serverless registering

      b) Execute ongoing information handling

      c) Perform stream handling continuously

      d) Mechanize day by day reinforcements

      e) Change information as it travels through exceptional assets

      f) Use Amazon API Gateways to send solicitations to Lambda through HTTP end-focuses

      g) Use Lambda’s adaptability and cost investment funds to deal with clicks in-application

      h) Process objects you transfer to Amazon S3

      i) Investigate continuous logs

      j) Where you have a constant flow of examples that last a brief time frame

      k) Keep up with application execution at any scale

      l) Document handling progressively

      m) Get ready information for a Machine Learning (ML) model

      n) Use in the back-finish to assemble applications that are touchy to idleness

      o) Construct web applications that scale all over consistently, even across different server farms

      p) Handle outsider API demands for serverless back-end

      q) Convert records into various configurations continuously

      r) AWS Lambda is continually advancing, so you can expect more abilities soon.

      What are AWS Lambda’s weaknesses?

    • However, Lambda isn’t perfect. Think about the accompanying situations of were not utilizing AWS Lambda.
    • You want to keep your time-delicate responsibilities little to lessen the inertness trademark in serverless processing. Keep in mind, the on-request nature of serverless figuring implies the framework closes down any capacity that you haven’t utilized in more than 15 minutes. The following time you call it, it could take a couple of milliseconds to a few seconds to awaken (cold beginning), prompting idleness. Different AWS value levels offer fluctuating wake-up speeds.
    • You would rather not use Lambda for long-running responsibilities since it runs examples/capacities for as long as 15 minutes all at once.
    • It limits simultaneous capacity executions to 1,000.
    • AWS Lambda bills can immediately go through your financial plan assuming you are uncertain how to advance AWS costs.

    • AWS Lambda Pricing Explained: How Does The Pay-As-You-Go Pricing Work?

      Lambda doesn’t charge by server units. All things considered, you pay for the:

      a) Number of solicitations AWS served, and

      b) The time it took those capacities to execute your code (span)

      c) AWS considers a solicitation quickly it begins to execute in light of a conjure call or occasion warning. It then, at that point, computes span from the time your Lambda work (your code) begins to execute until it ends or returns.

      d) The assistance meters charging in 1-millisecond increases. However, the genuine cost per span relies upon how much memory you dispense a capacity.

      e) When you pick how much memory you need for your capacity inside the AWS Lambda asset model, Lambda will dole out your capacity proportionate CPU, RAM, and other process assets. That occurs each time you adjust your remembrance requirements.

      For Provisioned Concurrency, Lambda counts:

    • How much simultaneousness you design, and
    • For the term you design it
    • You’ll likewise pay for reactions and terms if you empower Provisioned Concurrency for your capacities. The amount you pay per solicitation and term may likewise rely upon your area, albeit most locales get similar rates.
    • In any case, assuming you are in Cape Town, South Africa, expect the most costly rate at $0.27/1 million solicitations and $0.0000221/GB-second.

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      Step by step instructions to work out AWS Lambda costs:

      AWS offers each record holder 1 million free demands and 400,000 GB-seconds of register time month to month. Utilize not exactly these numbers, and you will not need to pay AWS a penny. Yet, consider the possibility that you utilize more than whatever the AWS complementary plan offers. When you have the solicitations, length, and memory information and rates, it’ll be more straightforward to ascertain the amount you can hope to pay for AWS Lambda for your necessities and area. Here is a model.

      Say your association is in North Virginia (US), and you assign your capacity 512 MB of memory, execute it 4 million times in a month, and run for 150 milliseconds each time. Compute your AWS Lambda charge like this:

    • In the first place, convert 512 MB into GBs by partitioning 1024 MB by 1024 MB (the precise number of MBs in 1 GB), which works out to 1 GB.
    • Second, convert 150 milliseconds into seconds by isolating 150 by 1,000 (number of milliseconds in 1 second), which rises to 0.15 seconds.
    • Then, at that point, find per demand and span charges on the AWS Lambda evaluating page and base your rate on where you are. The expenses are $0.020 per 1 million solicitations and $0.0000166667/GB-second length for North Virginia.
    • To observe your billable length, duplicate how many executions X how long they kept going in a flash, so 4 million X 0.15 seconds = 600,000 seconds. Then, at that point, duplicate the number of seconds X memory add up to find the GB-second sum, so 600,000 seconds X 1 GB = 600,000 GB-seconds.
    • Recall AWS offers the initial 400,000 GB-seconds for nothing, so 600,000 GB-seconds – 400,000 GB-seconds = 200,000 GB-seconds in billable GB-seconds. Presently, the month to month register charges = Billable GB-second span X expense each GB-second, so 200,000 GB-second X $0.0000166667/GB-second = $3.33334 = $3.33
    • Presently observe your billable solicitations for the month by first taking out 1 million complementary plan demands from the month’s complete solicitations, so 4,000,000 solicitations – 1,000,000 solicitations = 3,000,000 billable solicitations for the month.
    • Then, at that point, compute the month’s solicitation charges = Charges per 1 million solicitations X billable solicitations for the month, so $0.20 per Million X 3,000,000/1000,000 = $0.2 X 3 = $0.6
    • Presently take complete register charges + absolute solicitation charges = Month’s all out charges. That is $3.33 + $0.6 = $3.93 for that month.
    • That model dives into AWS Lambda estimating as it were. You might pay more relying upon the other AWS administrations you use with Lambda, for example, information move charges.
    • That is not all. Assume you utilize four unmistakable memory sizes to run four unique capacities.
    • All things considered, you’ll have to compute the all-out month-to-month charges for every one of the four capacities independently. Then, at that point, add the four expenses together to show up at the last total you’ll pay for utilizing proportionate AWS Lambda processing assets.
    • Moreover, if you want to utilize Provisioning Concurrency, you’ll likewise utilize a somewhat unique computation because these charges can be more perplexing. Here is a depiction from AWS, for instance:

    • Credit: AWS Lambda

      On the off chance that in the wake of seeing these computations, you feel dealing with your AWS bill can rapidly wind out of your manual number crunchers’ control like a runaway truck, that is because it can. It normally does, except if you know how best to screen and quantify your AWS Lambda spend.

      How To Monitor And Measure Lambda Costs:

      1. Presently picture this. More than 80% of AWS clients who recently ran compartments in AWS had changed to Lambda by January 2020. Many refer to Lambda’s expected expense reserve funds and its functional straightforwardness as significant explanations behind taking that action.

      2. Be that as it may, utilizing Lambda doesn’t generally bring about advantageous expense reserve funds. You need to know how to advance AWS expenses to see a decrease in your Lambda spend or higher ROI.

      3. Many expense enhancement instruments are famously over-subject to labeling, are inconvenient, and excessively mind-boggling. They likewise don’t give significant bits of knowledge, for example, planning expenses for explicit unit costs, similar to cost per client.

      4. That makes their results excessively convoluted for some colleagues to comprehend or illuminate information-driven choices. Without clear perceivability into your Lambda costs, your groups may not know how their work influences all the other things, for example, your organization’s capacity to value items or administrations beneficially or work inside your designing spending plan.

      5. That can be an exorbitant slip-up, a great deal like Adobe in 2018 when a dev group chipping away at an Azure task piled up $80,000 each day for seven days in unforeseen charges. Pinterest, Intuit, CloudOne, and Infor have likewise gotten astonishing distributed computing bills previously.

      All things considered, you need a cloud cost knowledge stage that shows you something as clever and exact as this:

    • That is a CloudZero Cost Per Customer report, which assists associations with seeing their cloud costs planned to explicit clients.
    • With Cloudera, you can likewise pull other simple to-process reports to assist you with planning AWS expenses for explicit groups, highlights, and items. Furthermore, our cloud cost insight stage will alarm you of cost inconsistencies so you will not need to acknowledge you are losing money hand over fist seven days after the fact as Adobe did.
    • At last, CloudZero gives you the expense permeability you want to quantify, screen, and even streamline your AWS Lambda costs. Demand a demo today to perceive how you can handle and foresee your cloud enjoy with certainty.

    • Constraints of AWS Lambda:

    • A few constraints are equipment explicit and some are limited by the engineering, how about we examine every one of them. Equipment constraints incorporate the plate size, which is restricted to 512 MB, the memory can shift between 128 MB and 1536 MB. Then, at that point, there are some other, for example, the execution break can be amplified to only 5 minutes, your solicitation body payload can be not more than 6 MB and your solicitation body is 128 KB. The solicitation body payload resembles the information that you send with a “GET” or “PUT” demand in HTTP, whereas the solicitation body would be the kind of solicitation, the headers, and so on.

    • In reality, these are not limits, but rather are the plan limits that have been set in the design of Lambda so on the off chance that your utilization case doesn’t fit these, you generally have the other AWS process administrations available to you. We examined in this AWS Lambda Tutorial how taking care of assignments in Lambda is “not” drawn-out and tedious. We should now cover the cost part too.

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      AWS Lambda offers a strong tool stash for building secure and versatile applications. A considerable lot of the prescribed procedures for security and consistency in Lambda are equivalent to in all AWS administrations, yet some are specific to Lambda. This whitepaper depicted the advantages of Lambda, its appropriateness for applications, and the Lambda-oversaw runtime climate. It additionally incorporates data about observing and examining, security and consistency best practices. As you contemplate your next execution, consider what you found out with regards to AWS Lambda, and how it may further develop your next responsibility arrangement.

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