Consider adding HEALTHCHECK to Dockerfile

[SaswatPadhi]

Hi,
I use an automation to monitor the health of all my running containers. docker ps for example shows the health status for currently running containers. However, no status is currently displayed for my teslamate container.
Please consider adding a HEALTHCHECK instruction in teslamate's Dockerfile.

A super simple health check could be just to curl port 4000 and see if the server is running (return code 200). But a better health check would be to somehow detect if teslamate is in an error state (either API keys are not configured, or no longer work, or the API is currently unavailable etc). I'm fairly new to this code base though, and am not sure how to query this.

[cusooner]

Here is a little workaround in the meantime:

instead of "image", use "build" in your docker-compose.yml

    build: 
      dockerfile: Dockerfile.teslamate

and add the healthcheck section to the teslamate service:

    healthcheck:
      test: curl --fail http://localhost:4000 || exit 1
      interval: 1m
      timeout: 10s
      retries: 3

additionally, create Dockerfile.teslamate:

FROM teslamate/teslamate:latest

USER root
RUN apt-get update && apt-get install -y --no-install-recommends curl 
USER nonroot:nonroot

The build is needed since the original Dockerfile does not include curl.

[SaswatPadhi]

@cusooner Yes, I use a similar workaround for now. To avoid a build, I use nc instead:

    healthcheck:
      test: "nc -z localhost 4000"
      interval: 15s
      timeout: 2s
      start_period: 60s

but this would only check if the port is "open". Your workaround would additionally check if the port is serving HTTP successfully.