Hi SquareFish25 , regarding the security group configuration:
The ports for ElasticSearch, Redis and MongoDB should not be exposed to the whole world. In fact, you can actually even configure docker-compose so they won't be exposed outside of the docker network (see https://allegro.ai/docs/deploying_trains/trains_server_config/#network-and-security )
Also, note that port 8008 is for API and 8081 is for the fileserver (just so your descriptions there will be correct)