| ▲ | Rust for AWS Lambda, the Docker Way(beeb.li) |
| 31 points by beeb 5 days ago | 8 comments |
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| ▲ | newfocogi a day ago | parent | next [-] |
| One of the massive benefits for Rust on Lambda is (as the author mentions) "extremely low start-up time, CPU usage and memory footprint". It's not clear to me if deploying Rust to Lambda via a docker image actually negates some of those benefits. |
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| ▲ | foo4u a day ago | parent | next [-] | | Using Lambda functions stored in ECR has no impact on performance from my experience. AWS Lambda uses Firecracker under the hood, which builds a VM from a container image. It's likely that non-ECR image based Lambdas are actually packaged as a container image before being launched into a Firecracker VM. https://aws.amazon.com/blogs/aws/firecracker-lightweight-vir... | | |
| ▲ | beeb a day ago | parent [-] | | This has been my experience as well, there was little to no impact on execution time at least. |
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| ▲ | beeb a day ago | parent | prev [-] | | Good question! I ran some benchmarks before because I was also curious and besides some slightly larger standard deviation for cold starts execution time, there was so significant difference in performance when using docker. |
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| ▲ | tiew9Vii a day ago | parent | prev | next [-] |
| An alternative to this is to statically compile and use scratch docker image. Another tip is if writing a http app etc Axum/Actix have Lambda shims. I add a cli flag “—lambda” which enables the shim. That means I can run the app locally, in Kubernetes, ECS, Lambda with minimum effort. It also makes dev easier pretending lambda doesn’t exist. |
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| ▲ | wrboyce 21 hours ago | parent | next [-] | | I’ve done similar with Python based apps a few times, there is something quite satisfying about a Docker image that can run in multiple contexts! (I’ve also distributed a Go based app using a FROM scratch image, but that’s not quite as cool imo). | |
| ▲ | beeb a day ago | parent | prev [-] | | Those are great tips! I'll have a look at the axum shim, which certainly would help if using axum in the first place. Minimal functions like we have at my work rarely need a fully featured framework however. |
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| ▲ | a day ago | parent | prev [-] |
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