Needed a online UDP echo server for some experimentation with Nordic nRF9160 and LTE-m and NB-IoT. The echo server is of course generic. This repo also contain a test client, deployment instructions and some experimentation with Distroless.

I am a strong believe in keeping complexity down. I believe that Distroless and Multistage build succeed in that.

• Platform independent build and run environment (Linux, Windows, Mac & cloud)
• Immutable environment
• No unnecessary "stuff" in run environment
• Relative uncomplicated configuretion (8 line Dockerfile for both build & run)
• Only Docker as dependency

One valid critic is that perhaps one type of complexity is just changed for another. Some times that is the case. E.g. How to debug? Mostly solvable but with added complexity. There are no silver bullets but for my case I would argue that it is a perfect match.

See distroless-go-hello for an minimal example.

• GO Lang
• Docker

Terminal 1:

cd echo_server
go run main.go

Terminal 2:

cd test_client
go run main.go 0.0.0.0

Terminal 1:

cd echo_server
docker build --rm -t echo .
docker run --rm -p 1234:1234/udp -t echo

Terminal 2:

cd test_client
go run main.go

Start server on Google cloud

Terminal:

cd test_client
go run main.go [SERVER_IP]