How I built an AWS Lambda clone with Firecracker microVMs
The article discusses the creation of a serverless runtime using Firecracker microVMs, aimed at improving cold start times. It details the architectural decisions made to enhance performance while maintaining isolation. Key optimizations include snapshot reuse and reduced inter-process communication overhead.
- ▪The project aims to understand the execution layer of AWS Lambda functions and improve cold start times.
- ▪By using VM snapshots, the system can restore from a snapshot in 1-5ms compared to a full cold boot taking 200ms.
- ▪The architecture consists of a control plane for function deployment and a microVM runtime for executing user handlers.
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| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/vivek_1502/how-built-an-aws-lambda-clone-with-firecracker-microvms-1572 |
| Publication time | Thu, 21 May 2026 04:31:19 +0000 |
| Retrieval time | 2026-05-21T05:05:03.495Z |
| Last seen | 2026-05-21T05:05:03.495Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
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| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | Kqatzwn3h6YT |
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| Publisher visit | Yes — open original |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3943230) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Vivek jadhav Posted on May 21 How I built an AWS Lambda clone with Firecracker microVMs #linux #infrastructure #serverless #firecracker Ever wondered what actually happens when you invoke a Lambda function? Not the API layer but the execution layer. What runs your code, how it's isolated, and how AWS gets cold starts low enough to be usable? I wanted to understand that deeply. So I built it.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at DEV.to (Top).
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