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LocalEmu, a free, open-source AWS emulator: run 132 AWS services locally with one pip install (localemu.cloud)
submitted 1 month ago by to c/programming@programming.dev
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I maintain LocalEmu, a free and open-source (Apache 2.0) AWS emulator. It started as a fork of the archived LocalStack Community edition. The goal is to keep a genuinely free, open local AWS emulator alive and maintained.

What it does:

  • Emulates 132 AWS services on a single endpoint (localhost:4566)
  • Pure-Python core, with real Docker engines for Lambda, EC2, RDS, ECS, EKS, and OpenSearch
  • Point your existing AWS CLI, boto3, Terraform, CDK, or Pulumi at it, zero config
  • No account, no auth token, no telemetry. Persistent state across restarts
  • Optional fidelity knobs: IAM policy enforcement, throttling, latency injection, Lambda cold starts

Why I built it: kill the multi-minute deploy loop, drop the dev/test AWS bill to zero, and stop keeping real credentials on dev machines.

It's for fast local dev, testing, and learning, not production, and not bit-for-bit parity with the real cloud.

Repo: https://github.com/localemu/localemu Site: https://localemu.cloud/

Happy to answer questions, and feedback is very welcome.

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[–] [S] -1 points 1 month ago (2 children)

aquafunk, the planet is in shit just for me, apparently. Not for the rest of humanity. Maybe I am the only one breathing pollution every day in most of the places I go, and the only one who has felt the climate change of the last twenty years that everyone else around me has been feeling too. Or maybe that one is also a scam invented by LLMs.

On "you are the one person presenting this app": yes, I am the one presenting it, and I am proud of what I shipped. I am also humble about it. A side question, since you took the time to lecture me about personal responsibility: did you install it? Did you actually try it? Do you work with AWS on a daily basis? Are you boycotting AWS too, since AWS is built on top of a mountain of open-source software they make profit from, and since AWS also uses LLMs to ship its features?

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  • [–] 2 points 1 month ago

    Those are all good questions, about the vendors the companies I buy things from, and my responsibility in their actions

    Maybe I should use less products that use AWS and you could consider your impact when using large language models to publish open source software. I'm almost certain both are in fact true statements, and if you knew me, you'd know I think "should" is strong language

    If you want me to make a list of the products and services I avoid? How about this: I feel guilt when I use a service or buy a thing from someone I know I shouldn't. I try not to do it out of pure convenience, and I don't try to defend the behavior when I fuck up

    Im truly sorry you suffered the ire of those who think your use of it is both wreckless and purely conveience based, but thems the breaks when you want to cut corners, dont care if its a hobby project or youre curing cancer- we can break the planet in scales previously unimaginable with our short sighted behaviour and Im about damn tired of "but everybody else is doing it"

    why not try building a community around coding and maintaing an AWS stack replacement? maybe other human beings would help you with the parts you could use some help with?

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