{"id":756984,"date":"2022-02-09T18:04:25","date_gmt":"2022-02-09T17:04:25","guid":{"rendered":"https:\/\/www.devoteam.com\/expert-view\/serverless-architecture-what-is-it-and-why-is-it-relevant\/"},"modified":"2025-10-16T12:49:12","modified_gmt":"2025-10-16T10:49:12","slug":"serverless-architecture-what-is-it-and-why-is-it-relevant","status":"publish","type":"expert-view","link":"https:\/\/devoteam.info\/uk\/expert-view\/serverless-architecture-what-is-it-and-why-is-it-relevant\/","title":{"rendered":"Serverless Architecture &#8211; what is it and why is it relevant?"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/12\/serverless-banner.jpg\" alt=\"\" class=\"wp-image-3025\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Serverless technology is on the tip of everyone\u2019s tongue, and <strong>cloud providers<\/strong> sure are pushing hard for its <strong>adoption<\/strong>. The question is, is it all overrated hype or is there something to actually gain from <strong>transitioning<\/strong> to this model? In this article we will briefly tackle a few points that will leave you with a clearer idea of Serverless\u2019 potential now, and in the future.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/12\/Screenshot-2022-02-09-103652.png\" alt=\"\" class=\"wp-image-2978\" width=\"651\" height=\"314\"\/><figcaption>The evolution of technologies used by businesses to deploy applications.<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Serverless purports itself to be a clear winner in many aspects of application development and deployment. We\u2019ve chosen a selection of these to enable the comparison between this <strong>new<\/strong> <strong>technology<\/strong> and two more <strong>traditional<\/strong> approaches, namely using virtualisation (EC2s) and containerisation (Kubernetes) on the <strong>AWS platform<\/strong>. We\u2019ll be comparing each technology based on:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Cost<\/li><li>Scalability<\/li><li>Ease of use<\/li><li>Sustainability<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"good-news-for-the-bottom-line-comparing-costs\"><strong>Good news for the bottom line &#8211; comparing costs<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cost is the aspect in which Serverless really <strong>shines<\/strong> in comparison to the alternatives. Serverless applications are proven to be a <strong>smaller financial burden<\/strong> than their counterparts in a multitude of cases. Before these can be demonstrated, one must first understand what is meant by the term \u201cserverless\u201d, and why it is a noun and not an adjective.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because the Serverless approach is all about running code without having to manage your own hardware, we are essentially replacing, or better, <strong>abstracting<\/strong>, the idea of an \u201calways-on\u201d server with <strong>event driven processes<\/strong>. This way, cost can be drastically reduced in most applications that don\u2019t require compute-intensive workloads or where extensive processing power is needed to manipulate huge amounts of data.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">How? Because the main advantage of Serverless offerings is the <strong>Pay as You Go<\/strong> model, which only charges the owner for the memory, compute power or data that they <strong>effectively use<\/strong>. Essentially, anytime the application is resting, not being used, it is not costing the owner anything (unlike a Kubernetes cluster or EC2 instances). For example, AWS Lambda is <a href=\"https:\/\/aws.amazon.com\/lambda\/pricing\/\" target=\"_blank\" rel=\"noreferrer noopener\">priced<\/a> by the number of invocations ($0.20\/1M requests) and the cost of the computing power used during that time ($0.0000166667 for every GB-second). Running a 128MB Lambda for 100ms would therefore set you back $0.00000041 in the Irish region.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Take a simple web application, in this case a voting app. Traditionally, we would have a Kubernetes cluster running on EKS, managing pods that contain the different applications needed for the webapp to work, end-to-end. These pods, depending on their size, may or may not reside inside the same node. In any case, such a webapp would need a <strong>powerful EC2<\/strong> instance to allow for 5 different applications to run continuously.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On the other hand, a Serverless implementation of the same exact webapp would feature components that do not run continuously, meaning only a fraction of the computational power is required. Furthermore, a serverless implementation would include components that are better optimised for running in cloud environments.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/12\/Screenshot-2022-02-09-103900-1.png\" alt=\"\" class=\"wp-image-3005\" width=\"570\" height=\"282\"\/><figcaption>Architecture diagram for simple voting webapp displaying differences between a Kubernetes (first) and Serverless (second) approach.<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Imagine this application receives 50 sessions a day. Using the <a href=\"https:\/\/docs.google.com\/spreadsheets\/d\/1WBeA0CfLqo0aT_js3e6XFljX9mSI22mwksVr16qt5tU\/edit?usp=sharing\" target=\"_blank\" rel=\"noreferrer noopener\">Cost Calculator<\/a> developed by <a href=\"https:\/\/medium.com\/@xavierlefevre\" target=\"_blank\" rel=\"noreferrer noopener\">Xavier Lef\u00e8vre<\/a> based on AWS\u2019s <a href=\"https:\/\/calculator.aws\/#\/\" target=\"_blank\" rel=\"noreferrer noopener\">official<\/a> cost calculator, this sort of application would cost <strong>0.50$ a month<\/strong> when developed using <strong>Serverless<\/strong> architecture, free tier included. This is minimal compared to the cost you would need to run the smallest type of EC2 instance for a whole month (<strong>t3a.nano at 3.43$<\/strong>, which still wouldn\u2019t be sufficient to run the whole K8s cluster). Even before considering the costs for self-managed monitoring and scalability, you can already see the potential for even further cost saving at a larger scale.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Another advantage of serverless, is that it allows <strong>granular cost control<\/strong> over each feature and piece of architecture you deploy, allowing for more efficient <a href=\"https:\/\/www.finops.org\/introduction\/what-is-finops\/\" target=\"_blank\" rel=\"noreferrer noopener\">FinOps<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"but-will-it-scale\"><strong>But will it scale?&nbsp;<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Scalability is another <strong>flagship feature<\/strong> of Serverless architecture, indeed living up to its expectations. Why? Well, let\u2019s go back to the voting webapp example. In Kubernetes, when load increases and individual pods are under strain, more pods will automatically be created to match the demand (only if you have specified a Deployment\/ReplicaSet, however). This means that new containers are spun up on new nodes, and <strong>more EC2 instances are launched<\/strong>, with all the <strong>overhead<\/strong> that comes with them.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Serverless components like Lambdas, on the other hand, allow for a <strong>large number of concurrent executions,<\/strong> meaning that there is <strong>no wait time<\/strong> for virtual machines to turn on and scaling is <strong>nearly instant<\/strong>. In Ireland, 3000 Lambdas will launch concurrently during a <a href=\"https:\/\/docs.aws.amazon.com\/lambda\/latest\/dg\/invocation-scaling.html\" target=\"_blank\" rel=\"noreferrer noopener\">burst<\/a>, and AWS will keep adding capacity for 500 more every minute. This, <strong>without any effort<\/strong> from you at all.<br>The key difference here is that while the developer <strong>does not have to concern themselves with scaling policies<\/strong> when following a Serverless approach (as it is entirely managed by the cloud provider), the same cannot be said when dealing with containers, where this automation has to be <strong>set up and configured beforehand<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"considering-ease-of-use\"><strong>Considering ease of use<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Serverless is particularly suited for use cases where <strong>time to market<\/strong> is important and the development team has <strong>no operational knowledge<\/strong> or has <strong>no time<\/strong> to deal with the underlying infrastructure. This means that developers can <strong>spend more time focusing on the application<\/strong> rather than deploying the infrastructure to support it.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With serverless, developers can build applications rapidly. Serverless components <strong>abstract away the infrastructure<\/strong> and hand it over to AWS to manage. This allows developers with little to no experience of AWS to be able to <strong>quickly start building<\/strong>, meaning they are free to focus on what&#8217;s important to them and do not have to worry about upgrading &amp; patching servers.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Rapid development is also made easier with Lambda, which supports a <strong>diverse range of programming languages<\/strong> allowing for developers with a variety of skill sets to utilise the service.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lambda, however, isn\u2019t the only serverless alternative to reducing the time to market in a similar fashion. <strong>Fargate<\/strong> is another AWS offering that allows you to keep using Kubernetes on a <strong>pay as you go<\/strong> basis, without having to radically redevelop your application to fit a new architecture. This is a very popular option for <strong>legacy applications<\/strong>, as it&#8217;s much <strong>simpler to manage<\/strong> than a traditional EC2 instance or EKS cluster.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AWS handles the maintenance of the underlying infrastructure for Fargate meaning you <strong>don\u2019t have to deal with any of the overhead<\/strong> of patching and updating. If there was a security vulnerability then EC2 users would need to manually patch this while Fargate users wouldn\u2019t need to worry as this is left to AWS to fix. For this reason Fargate is seen as a <strong>more secure option<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Generally, there is no significant cost saving in using Fargate over EC2\/EKS, however, in the right use case Fargate can offer great benefits. Fargate has a pay as you go model where you\u2019re billed based on how many CPU cores and memory your workload uses per second, meaning <strong>you only pay for what you use<\/strong>. With EC2, users can under provision their instances where they don\u2019t have enough instances for the demand of their application, or more commonly over provision their instances in which they over pay for the resources they\u2019re utilising. Fargate, however, <strong>autoscales out of the box<\/strong>, removing this problem entirely (thus making it much easier to use).<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/12\/Screenshot-2022-02-09-104050-1.png\" alt=\"\" class=\"wp-image-3011\" width=\"624\" height=\"349\"\/><figcaption><br>Visualisation of a multi-account CI\/CD pipeline that only makes use of AWS Serverless components to deploy changes.<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">AWS also provides a suite of <strong>serverless developer tools<\/strong> to build a CICD workflow for your applications which in turn speeds up the time to market. These services include CodeCommit (source control), CodeBuild (continuous integration), CodeDeploy (deployment service), CodePipeline (continuous delivery), CodeArtifact (artifact repository). The advantage of these <strong>completely AWS managed<\/strong> services is that they require <strong>minimal setup<\/strong> compared to alternatives such as Jenkins and Gitlab. In the diagram above you can see how these services can be integrated together and what the architecture would look like.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SUSTAINABILITY<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sustainability is an important aspect that you should keep in mind when designing solutions as <strong>sustainability in the cloud <\/strong>is the user\u2019s responsibility. Running an application in a serverless architecture can be an efficient way to lower your workload&#8217;s carbon footprint.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Let&#8217;s do a comparison of how the carbon footprint varies between an application using EC2 vs Lambda. If you were to run an application on an EC2 instance there might be periods where the <strong>instance is sitting idle<\/strong>. This means that the instance is <strong>under utilised and wasteful<\/strong> in terms of energy.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/12\/Screenshot-2022-02-09-104528.png\" alt=\"\" class=\"wp-image-2987\" width=\"488\" height=\"304\"\/><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Running this via lambda is more <strong>energy efficient<\/strong>. When a lambda is triggered it runs within a microVM on an AWS managed EC2 instance. When the lambda finishes running the microVM is replaced with another so that someone else&#8217;s lambda can run. This approach ensures <strong>higher utilisation of existing resources<\/strong> as opposed to utilising a fraction of new resources.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"so-is-it-time-to-go-serverless\"><strong>So is it time to go serverless?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Having compared and contrasted architecture solutions, it&#8217;s true to say that Serverless does not fit all use cases and containerisation remains the best option for certain applications.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Indeed, there are plenty of cases where Serverless is not the correct solution to a problem and can end up <a href=\"https:\/\/einaregilsson.com\/serverless-15-percent-slower-and-eight-times-more-expensive\/\">costi<\/a><a href=\"https:\/\/einaregilsson.com\/serverless-15-percent-slower-and-eight-times-more-expensive\/\" target=\"_blank\" rel=\"noreferrer noopener\">n<\/a><a href=\"https:\/\/einaregilsson.com\/serverless-15-percent-slower-and-eight-times-more-expensive\/\">g more<\/a> than the older alternatives. Examples include applications where Java\/JVM is used, long running tasks are needed or when building applications that require access to low level APIs (eg. thread control)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Furthermore, regulatory restrictions might prevent certain companies (such as ones providing financial services or governmental organisations) from being able to use software and hardware shared between multiple customers, and would be better off using <a href=\"https:\/\/aws.amazon.com\/ec2\/dedicated-hosts\/\" target=\"_blank\" rel=\"noreferrer noopener\">dedicated hosts<\/a> if they still want to make use of the cloud. Serverless applications are generally not available on dedicated hosts and would therefore be unsuitable for these use cases.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, when Serverless is implemented properly it offers <strong>significant cost savings<\/strong> over traditional approaches, positioning itself not only as a valid alternative, but one that offers significant improvements on current technologies.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you would like more information or advice on how serverless architecture could help you cut costs &#8211; and carbon contact us here.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Find out more about our partnership with AWS.&nbsp;<\/p>\n\n\n","protected":false},"excerpt":{"rendered":"<p>Serverless technology is on the tip of everyone\u2019s tongue, and cloud providers sure are pushing hard for its adoption. The question is, is it all overrated hype or is there something to actually gain from transitioning to this model? In this article we will briefly tackle a few points that will leave you with a [&hellip;]<\/p>\n","protected":false},"featured_media":369305,"template":"","categories":[],"tags":[1076],"industry":[],"class_list":["post-756984","expert-view","type-expert-view","status-publish","has-post-thumbnail","hentry","tag-aws-uk"],"acf":[],"cards":"\n\t<div class=\"single-post-card\">\n\n\t\t<figure class=\"wp-block-post-featured-image\"><a href=\"https:\/\/devoteam.info\/uk\/expert-view\/serverless-architecture-what-is-it-and-why-is-it-relevant\/\" target=\"_self\" ><img width=\"1500\" height=\"814\" src=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/12\/serverless-1.jpg\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"Serverless Architecture &#8211; what is it and why is it relevant?\" style=\"aspect-ratio:4\/3;width:100%;object-fit:cover;\" decoding=\"async\" loading=\"lazy\" srcset=\"https:\/\/devoteam.info\/wp-content\/uploads\/2024\/12\/serverless-1.jpg 1500w, https:\/\/devoteam.info\/wp-content\/uploads\/2024\/12\/serverless-1-300x163.jpg 300w, https:\/\/devoteam.info\/wp-content\/uploads\/2024\/12\/serverless-1-1024x556.jpg 1024w, https:\/\/devoteam.info\/wp-content\/uploads\/2024\/12\/serverless-1-768x417.jpg 768w\" sizes=\"auto, (max-width: 1500px) 100vw, 1500px\" \/><\/a><\/figure>\n\n\t\t\n\t\t<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-43282307 wp-block-group-is-layout-flex\">\n\t<p style=\"font-style:normal;font-weight:700\" class=\"has-link-color wp-elements-1 wp-block-lp-post-type has-text-color has-primary-color has-small-font-size\">Expert View<\/p>\n\n\t\t\n\t\t<h3 style=\"font-style:normal;font-weight:400\" class=\"wp-block-post-title has-base-font-size\"><a href=\"https:\/\/devoteam.info\/uk\/expert-view\/serverless-architecture-what-is-it-and-why-is-it-relevant\/\" target=\"_self\" >Serverless Architecture &#8211; what is it and why is it relevant?<\/a><\/h3><\/div>\n\t\t\n\t<\/div>\n\n","yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Serverless Architecture - what is it and why is it relevant? 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