init.d script for Node-RED on a Raspberry Pi

node-red

#!/bin/bash
### BEGIN INIT INFO
# Provides:          node-red
# Required-Start:    $local_fs $remote_fs $network
# Required-Stop:     $local_fs $remote_fs $network
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start or stop the node-red server
### END INIT INFO

# Can be downloaded and installed in one go by using this command
#  sudo wget -O /tmp/download https://gist.github.com/DaveThw/da394c8d04fa2bba55ac/download && sudo tar -zxf /tmp/download --strip-components 1 -C /etc/init.d && sudo chmod +x /etc/init.d/node-red && sudo update-rc.d node-red defaults

# Or download and just move to /etc/init.d using this command
#  sudo wget -O /tmp/download https://gist.github.com/DaveThw/da394c8d04fa2bba55ac/download && sudo tar -zxf /tmp/download --strip-components 1 -C /etc/init.d && sudo chmod +x /etc/init.d/node-red
# and then start/stop/restart the service with these commands
#  sudo service node-red stop
#  sudo service node-red start
#  sudo service node-red restart
# And then, if/when you want Node-RED to autostart on bootup, use this
#  sudo update-rc.d node-red defaults
# Conversely, if you want to stop Node-RED autostarting on bootup, use this
#  sudo update-rc.d -f node-red remove

# User that launches node-RED (it's advised to create a new user for Node-RED)
# You can do:
#  sudo useradd node-red
# then change line below from  USER=pi  to  USER=node-red
USER=pi

# The location of Node-RED
# This is where Node-RED was installed by default before Node-RED v.0.10.4
#SCRIPT_DIR='/home/pi/node-red/'
# From v.0.10.4 onwards, Node-RED is now installed here
SCRIPT_DIR='/usr/lib/node_modules/node-red/'

# Maximum amount of memory used by garbage before it is garbage collected (needs to be lower than the default 512 on a RaspberryPi)
# Use  free -h  to see how much free memory you have (before starting Node-RED!)
#MAX_OLD_SPACE_SIZE=64
MAX_OLD_SPACE_SIZE=128
#MAX_OLD_SPACE_SIZE=256

# Verbose logging? Comment this next line out (ie. put a '#' at the beginning) for less verbose logging
#  (in particular, with this set Node-RED will log details on any nodes that fail to register during startup)
VERBOSE='-v'


# DON'T CHANGE anything below this line unless you know what you're doing!


NAME=node-red
# Previously (Raspberry Pi 1?), Node was installed here:
#   /usr/local/bin/node
# Node is now seems to be installed here (Raspberry Pi 2, with Node-RED v.0.10.6, as of May 2015...):
#   /usr/bin/node
DAEMON=$(which node)
if [ ! -x "$DAEMON" ]; then
	echo "Error: Unable to find node - is it installed?"
	exit 1
fi
OPTIONS="--max-old-space-size=${MAX_OLD_SPACE_SIZE} red.js ${VERBOSE}"
LOG="/var/log/${NAME}.log"
PIDFILE="/var/run/${NAME}.pid"

. /lib/lsb/init-functions

start_daemon () {
	# If the log file doesn't yet exist, attempt to create it
	! [ -e "$LOG" ] && sudo touch "$LOG"
	# Check if USER is the owner of the log file, and chown if not
	[ -e "$LOG" ] && [ -z "$(find "$LOG" -user $USER)" ] && sudo chown $USER "$LOG"
	
	start-stop-daemon --start --background \
		--chuid $USER \
		--chdir $SCRIPT_DIR \
		--name $NAME \
		--make-pidfile --pidfile $PIDFILE \
		--startas /bin/bash -- -c "exec $DAEMON $OPTIONS >> $LOG 2>&1"
	# check if the daemon actually started, and return an appropriate result with log_end_msg
	status="0"
	pidofproc $DAEMON >/dev/null || status="$?"
	log_end_msg $status
}

stop_daemon () {
	status="0"
	start-stop-daemon --stop --signal INT --quiet \
		--chuid $USER \
		--chdir $SCRIPT_DIR \
		--exec $DAEMON --pidfile $PIDFILE --retry 30 \
		--oknodo || status="$?"
	log_end_msg $status
}

case "$1" in
	start)
		log_daemon_msg "Starting daemon" "$NAME"
		start_daemon
		;;
	stop)
		log_daemon_msg "Stopping daemon" "$NAME"
		stop_daemon
		;;
	restart)
		log_daemon_msg "Stopping daemon" "$NAME"
		stop_daemon
		sleep 5
		log_daemon_msg "Re-Starting daemon" "$NAME"
		start_daemon
		;;
	status)
		status_of_proc -p "$PIDFILE" "$DAEMON" "$NAME"
		exit $?
		;;
	*)
		echo "Usage: $0 {start|stop|restart|status}"
		exit 1
esac
exit 0