Node-RED.service

# This script work on any system using systemd as the init process.
# It works on Debian/Raspbian Jessie.
# If you have Debian/Rapbian Wheezy and want to use this script with systemd 
# follow the information here : https://wiki.debian.org/systemd

# To easily download, install and set at startup:
# wget -O /tmp/download https://gist.github.com/Belphemur/3f6d3bf211b0e8a18d93/download && sudo tar -zxf /tmp/download --strip-components 1 -C /etc/systemd/system/ && sudo systemctl --reload-daemon && sudo systemctl enable Node-RED

# To consult the log : journalctl -u Node-RED
[Unit]
Description=Node-RED is a tool for wiring together hardware devices, APIs and online services in new and interesting ways.
After=syslog.target network.target
Documentation=http://nodered.org/

[Service]
Environment="NODE_OPTIONS=--max-old-space-size=128"
Environment="NODE_RED_OPTIONS=-v"
#Full Path to Node.js
ExecStart=/usr/local/bin/node $NODE_OPTIONS red.js $NODE_RED_OPTIONS
WorkingDirectory=/home/pi/node-red/
# User/Group that launches node-RED (it's advised to create a new user for Node-RED)
# You can do : sudo useradd node-red
# then change the User=root by User=node-red
User=root
Group=root
Nice=10
SyslogIdentifier=Node-RED
StandardOutput=syslog
# Make Node-RED restart if it fails
Restart=on-failure
# Node-RED need a SIGINT to be notified to stop
KillSignal=SIGINT

[Install]
WantedBy=multi-user.target

The /tmp/download is a zip file, not a gzip file. On my Ubuntu system

sudo apt install unzip

wget -O /tmp/download https://gist.github.com/Belphemur/3f6d3bf211b0e8a18d93/download

unzip /tmp/download

Now edit the 3f6d3bf211b0e8a18d93-master/Node-RED.service file and make any changes you like as per the prior posts here.