Minecraft Server Pinger for server hang detection written on Bash

mcpinger

#!/bin/bash
# Minecraft Server Pinger
#
# If the server is pining successfully exits with 1,
# else (if server hangs) exits with 0.

HOST=$1
PORT=$2

if [[ "x$HOST" == "x" || "x$PORT" == "x" ]]; then
	echo "Usage: $0 host port"
	exit 1
fi

VAL=$(( echo -n -e "\xFE\x01"; sleep .5) | nc $HOST $PORT | wc -m)
if [[ $VAL -gt 2 ]]; then
	echo Server is ok!
	exit 1
else
	echo FAIL
	exit 0 # allow chained script to work, use it like this: pinger && /etc/init.d/mc restart
fi

nc is not distributed by default with some Linux distributions, you might want to specify at least an open source location for it. But most definitely a Debian location for it as Deb systems are the most common.

I found it, nc, comes from the package netcat. For Debian systems you can get it with "apt-get install netcat"

Handy script. Consider specifying a timeout to nc e.g. nc -w10 $HOST $PORT.

Damn, this is ancient 😄