Netdata init script for Synology DSM

rc.netdata

#!/bin/bash

# Install this as `/etc/rc.netdata` and call it from `/etc/rc.local`
# to have it executed on boot.

NETDATA_DIR=/opt/netdata
DAEMON=$NETDATA_DIR/bin/srv/netdata
TIMEOUT=30  # seconds to wait for netdata to exit

[ -x $DAEMON ] || exit 0

function get_pid() {
	pid=$( ps ax | grep -v grep | grep -m 1 $DAEMON | awk '{ print $1 }' )
}

function check_netdata() {
	count=1
	while [ $count -lt $TIMEOUT ]; do
		get_pid
		if [ -z $pid ]; then
			break
		else
			sleep 1
			count=$(( $count + 1))
		fi
	done

	if [ $count -eq $TIMEOUT ]; then
		echo "Timeout exceeded waiting for netdata to exit."
		echo "Use '$0 kill' to force netdata to exit."
		exit 1
	fi
}

function stop_netdata() {
	get_pid
	if [ "x$pid" != "x" ]; then
		if [ "x$1" = "xforce" ]; then
			kill -9 $pid
		else
			kill $pid
		fi
	else
		echo "No running netdata found."
	fi

}

function start_netdata() {
	get_pid
	if [ "x$pid" = "x" ]; then
		echo "Starting Netdata."
		$DAEMON
	else
		echo "Netdata already running with pid $pid"
	fi
}

case "$1" in
    start)
		start_netdata
    ;;
    stop)
		echo "Shutting down Netdata."
		stop_netdata
    ;;
	restart)
		echo "Shutting down Netdata."
		stop_netdata
		if [ "x$pid" != "x" ]; then
			echo "Waiting maximum of $TIMEOUT seconds for netdata to exit."
		fi
		check_netdata
		start_netdata
	;;
	kill)
		echo "Killing netdata."
		stop_netdata force
	;;
	status)
		get_pid
		if [ "x$pid" != "x" ]; then
			echo "Netdata running with PID $pid"
		else
			echo "No running netdata found."
		fi
	;;
    *)
        echo "Usage: $0 {start|stop|kill|restart|status}"
        exit 1
esac

exit 0

I agree that it's not likely to ever happen, since it would require that the grep command had a pid lower than the running netdata process. However, placing grep -v grep first in the chain changes "unlikely to happen" to "will never happen," and that seemed reasonable.