logoalt Hacker News

AWS Finally Built Its Own AWS Emulator

252 points • by super_linear • today at 6:21 PM • 64 comments • view on HN

Comments

CharlieDigital • today at 6:27 PM

Skeptical of using because it's not clear whether this was just an exercise or a real product they are going to ship and maintain.

Floci[0] has been great for me. Use the Testcontainers[1], too.

Bonus: works for GCP and Azure, too (so far have only used in limited capacity, though).

[0] https://floci.io/

[1] https://testcontainers.com/modules/floci/

➕ show 1 reply
cxr • today at 6:59 PM

No idea why there's so much of this lately, but there are way too many editorialized submission titles hitting the front page recently. Please stop doing this.

<https://news.ycombinator.com/newsguidelines.html>

➕ show 1 reply
Waterluvian • today at 7:29 PM

If I understand this correctly, it means I can point my entire CDK project to the emulator and test a `cdk deploy`?

I'm curious just how realistic the "internal" behaviour is emulated. It's been a while (since I got my stack working and I just don't like touching it now...), but I recall it being a real pain that sometimes odd, sometimes inconsistent things happened with setup and teardown (even through Terraform), which led to long timeouts if you did things in the wrong (but seemingly valid) order.

__natty__ • today at 7:36 PM

For me, what is interesting in this project is it's git history.

morelandjs • today at 7:10 PM

Fellow Amazonian here. Want to say that I’m grateful you built this and it has tremendous value if pulled off well and properly maintained.

Agentic development is all about closing off a system as much possible, then mocking up or simulating any inputs or dependencies that cannot be closed off. At that point, you let Claude crawl over the system and do its thing.

This inevitably runs into problems with infrastructure and any tools that help mock up those interfaces will be tremendously valuable. Thank you!

gosen • today at 7:14 PM

Do I need to get certified to use it?

stuff4ben • today at 6:35 PM

Wonder if this could be considered a replacement for Ministack which itself was a vibe-code replacement of Localstack?

➕ show 1 reply
gateauxd • today at 6:41 PM

Excited to see this develop and be a free replacement to localstack / similar providers.

➕ show 1 reply
tptacek • today at 6:34 PM

The title for this story should be "aws-emulator, from AWS".

andreadito • today at 7:30 PM

Finally!

paavohtl • today at 7:05 PM

Looks like this was ~100% generated with Claude within the past month. Interestingly it still has a lot of occurrences of words that Opus used way too much pre 5.5, so maybe they're not using the latest models.

https://github.com/search?q=repo%3Aaws%2Faws-emulator+load-b...

https://github.com/search?q=repo%3Aaws%2Faws-emulator+%2Fno+...

https://github.com/search?q=repo%3Aaws%2Faws-emulator+golden...

➕ show 3 replies
microflash • today at 7:39 PM

> AWS Emulator is configured to collect and report usage data to AWS, to gain insight into how AWS Emulator is used. Telemetry is on by default.

They can't help themselves, can they?

I'll stick with Floci and Testcontainers.

ggcr • today at 7:17 PM

Will it be maintained? Or was it more of a toy-project for its large scale agentic blogpost? [0]

[0] https://www.aboutamazon.com/news/aws/how-autonomous-ai-agent...

sebmellen • today at 6:34 PM

RIP LocalStack… can’t say I’d be unhappy to see it go though.

forgotpwd16 • today at 6:57 PM

~30K commits in 3w; quality software for sure. Is someone trying to get promotion by tokenmaxxing? Ironic or unlucky coincidence or competitor(s) misdirection, that, only 2w ago, Amazon published memo discouraging AI abuse?

BorisMelnik • today at 6:45 PM

ok who's gonna build the GUI / web console on top of it?

➕ show 1 reply
varispeed • today at 7:25 PM

Just a little bit more to keep you hooked. You should do your best to stay away from these parasites. Especially if they don't respect your country and your people by not paying the right amount of tax.

swiftcoder • today at 6:57 PM

I guess they didn't decide this was worth it till they needed it to train an LLM, huh? Not like everyone (inside and outside of AWS) has needed such a test harness for years...

tonymet • today at 6:38 PM

A mere 20 years too late. Now it’s faster to have AI mock your APIs for you. AI has been a boon for test coverage.

➕ show 1 reply
rfgplk • today at 6:32 PM

> AWS Finally Built

Nope. Anthropics models did. Amazon is de facto obsolete, anyone with a bit of money and Claude on an API leash can replicate their entire business model, in days.