running command based on docker output

[Ahptt]

I run a 1.19 based server with the autopause feature enabled. To my understanding and testing, I can't connect to the server console via rcon. My situation is I am mining monero on the same system that I'm hosting a server. I want to be able to trigger my mining to stop when any client joins the server, and start up again once all clients leave.

The only idea I can come up with is a script that checks every 5 or 10 minutes the most recent log from docker logs ___ | grep joined, and also docker logs ___ | grep All\ clients\ disconnected and then run and if else to produce the desired result.

This seems very inefficient to me as this will have to run every so often, and I wonder with my current setup if there is a better way to ultimately trigger this, instead of consistently checking. Please let me know if you have any ideas or have done something similar. It's much appreciated! 😄

[itzg]

I actually like your idea of the periodic query and would suggest trying out a semi-builtin approach like this snippet used by auto-pause:

docker-minecraft-server/files/auto/autopause-fcns.sh

Lines 23 to 33 in 0d5e44a

	java_clients_connections() {
	local connections
	if java_running ; then
	if ! connections=$(mc-monitor status --host localhost --port "$SERVER_PORT" --show-player-count); then
	connections=0
	fi
	else
	connections=0
	fi
	echo $connections
	}

[Ahptt]

That looks great! My only question is how do I add my configuration to the container? Is this something I would modify and then build a container out of, or can I pass it through docker-compose as I would mods/datapacks? Thank you.

[itzg]

Good question. I would suggest building a separate image to run as a sidecar where you could pull in the mc-monitor binary from https://github.com/itzg/mc-monitor/releases/latest

With that, have your entrypoint be a script of some form that runs in a loop checking the status and taking actions needed.