It is not a fully functional local AWS stack. localstack uses moto to mock requests to AWS endpoints, and that does not support 100% of AWS's endpoints.
Agreed. It's more like an 85% functioning local version of the 80/20 of AWS. It doesn't cover all services but it is fairly comprehensive and does cover almost all the major ones.
Overall it's a really cool project. I had some networking issues running it inside Docker though. When I would place a message on an SNS topic it would come back with an exception triggering my exception handler, however it actually did send the message to the topic. Couldn't work it out and left it. Might revisit it later but that was an annoyance for me.
I tried using it to do some kind of integration testing with my AWS services (RDS, API Gateway, EC2, etc). I decided that was too much work, and since it'd force me to dockerize much of my application, I might as well use FOSS solutions that I can already run in docker. Easier to test, and cheaper.
https://github.com/localstack/moto/blob/localstack/IMPLEMENT...