### Creating a systemd Service File
>$ cd /lib/systemd/system

>$ sudo vi /lib/systemd/system/myNode.service

and put the following contents in it (example):

```sh
[Unit]
Description=Start app.js on my Node
After=network.target

[Service]
Environment=NODE_PORT=3001
Type=simple
User=pi
ExecStart=/usr/bin/node /home/pi/myApp/app.js
Restart=on-failure

[Install]
WantedBy=multi-user.target

```

### Using systemctl To Control Our App

**You have to do this whenever any of the service files change at all so that systemd picks up the new info.**
>$ sudo systemctl daemon-reload

**If you want to make the application start up when the machine boots, you accomplish that by enabling it**
>$ sudo systemtl enable myNode.service

**Other options**
>$ sudo systemctl [status,start,stop,restart,enable,disable] myNode.service

**List**
>$ systemctl list-unit-files | grep enabled