Docker stats monitor

Http4s application that uses fs2 streams to send docker stats and docker ps data over a websocket connection to a Scala JS frontend which visualizes the results using the chartist.js library.

Docker image

https://hub.docker.com/r/vasilvasilev97/docker-stats-monitor

Slim docker image (FROM scratch) containing only the application and docker binaries, along with the static site data. The application binary is completely statically compiled and linked Linux binary with absolutely no dependencies, generated using GraalVM native-image.

Run with:

docker run -d --name monitor --memory=64m --memory-swap=64m -p 8080:8080 -v /var/run/docker.sock:/var/run/docker.sock vasilvasilev97/docker-stats-monitor

and visit localhost:8080.

Note that we use --memory to configure the amount of memory available to the docker container. GraalVM native images can operate with a reasonably low memory consumption but it's impossible to figure out good ergonomics automatically on a machine with enough resources. Another option would be to configure heap size in the Dockerfile using native image configuration options.

Tests

There are integration tests with Docker that can be run using sbt run. Note: the docker executable needs to be available on the PATH and the docker daemon needs to be running when executing the tests.