Exploring Rust and Serverless Computing | RustMeUp

Exploring Rust and Serverless Computing: A Comprehensive Guide

The world of serverless computing has seen tremendous growth, especially with the rise of microservices and distributed systems. One of the languages that has been gaining popularity in this domain is Rust, renowned for its performance and safety measures. This article aims to deliver an in-depth understanding of using Rust for serverless computing.

What is Rust?

Rust is a modern system-level programming language focused on performance, safety, and memory management. Unlike its counterparts like C++ and Java, Rust operates in a manner that prevents segfaults and guarantees thread safety. Here’s a slight look into what makes rust really stand out:

  • Safety without garbage collection: Rust manages memory and other resources at compile time, without any runtime overhead.
  • Zero-cost abstractions: Rust is designed in a way that you can write high-level code, without affecting low-level performance.

What is Serverless Computing?

Contrary to its name, Serverless Computing doesn’t imply that there are no servers. Rather, it refers to a cloud-computing model where server management and capacity planning decisions are abstracted away from the developer. Notable merits of serverless computing include:

  • No server management: You no longer need to worry about operating system updates, patches, or server capacity.
  • Built-in Scaling: Your serverless application automatically scales up to meet increasing workloads, and scales down during quieter times to save costs.
  • Pay as you go: You only get billed for your actual usage, based on the time and resources used by your application.

What makes Rust a good fit for Serverless?

Rust's unique attributes make it a strong candidate for serverless computing.

  • Performance: As Rust is a compiled language, it directly communicates with the hardware, providing an excellent execution speed advantage. This increase in efficiency can lower costs in a serverless environment where billing is based on runtime.
  • Concurrency and safety: Rust has excellent support for concurrent operations and multi-threading with its ownership concept and zero-cost abstractions, thus ensuring high safety guarantees.

How to deploy Rust applications to AWS Lambda?

AWS Lambda, a prominent serverless computing service, has provided support for the Rust programming language since 2018. Here are the steps to get your Rust application deployed on AWS Lambda.

  1. Write Your Application: First, write your Rust application. Organize your code in library crates to maximize the code organization and reuse.
  2. Set up the AWS Lambda Rust Runtime: AWS provides a pre-built runtime for Rust on Lambda. Add the necessary AWS Lambda Rust runtime dependency (lambda_runtime) in your cargo.toml file.
  3. Define Lambda Handler: A Handler is a function that AWS Lambda invokes when the service executes your code.
  4. Package your application: Build your code and generate an executable. Use cargo build --release --target x86_64-unknown-linux-musl to create a binary.
  5. Create an AWS Lambda function: Use AWS Management Console, AWS CLI, or AWS SDKs to create a Lambda function.
  6. Deploy: Upload your packaged application to AWS Lambda.

Advantages of Rust in Serverless environment

In a serverless environment, Rust offers two prime advantages:

  • Resource Optimizations: Thanks to its low memory footprint and efficient CPU utilization, Rust applications can be highly cost-effective in a serverless setting.
  • Startup Time: Compiled binaries start up rapidly, a valuable trait for serverless applications where latency is a significant consideration.

Resources to learn Rust for Serverless Computing

Here are some resources for you to dive more into using Rust for serverless computing:

  1. AWS Rust Github: This Github repo has everything to help you get started on Rust with AWS Lambda, including the AWS SDK for Rust.
  2. The Rust Programming Language book by No Starch Press: This book is an excellent resource for Rust learners.
  3. Rust Building Blocks for AWS lambda: This is a YouTube video presentation about deploying Serverless Rust applications on AWS Lambda.


Rust in combination with Serverless Computing can be a powerful pair for developing high-performance, efficient, and cost-effective serverless applications. With growing community support and comprehensive guides like these, leveraging Rust for Serverless Computing is now more accessible than before.

RustMeUp invites you to join this growing community of Rust developers and revolutionize the serverless world. Happy Coding!

Frequently Asked Questions

Why Should I use Rust for Serverless Computing?

Rust's features like safety, performance, its memory management capability, and concurrency are what makes it a fit for serverless computing.

What resources can help me learn more about Rust and Serverless computing?

Resources like the AWS Rust Github page, the Rust Programming Language book by No Starch Press, and the YouTube presentation about Serverless Rust Apps on AWS Lambda can help you get started.

Can I deploy a Rust application to AWS Lambda?

Yes, AWS Lambda supports the Rust programming language. Detailed steps on how to do this are mentioned in the section titled 'How to deploy Rust applications to AWS Lambda?' in the article above.

How does Rust optimize resources in a Serverless environment?

Rust has a very low memory footprint and efficient CPU utilization, hence using Rust can lead to cost savings as serverless environments charge based on resource usage.

How does the start-up time of Rust impact Serverless applications?

Start-up time is crucial in a serverless environment, where the application has to start quickly to serve requests. As Rust applications are compiled to machine code, they have considerably lower start-up times.