Create Systemd service for Go application

Create new file with .service extension inside directory /lib/systemd/system/. In this case, i will create with the name pajak.service
Here is a simple structure to create service, fill the file we have created above with this and adapt with your app.
```
[Unit]
Description=Kurs Pajak

[Service]
Group=akhmad
Type=simple
Restart=always
RestartSec=5s
WorkingDirectory=/home/akhmad/pajak/
ExecStart=env HTTP_PORT=":8080" /home/akhmad/pajak/pajak
PermissionsStartOnly=true
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=sleepservice

[Install]
WantedBy=multi-user.target
```
From above service configuration, my app binary is inside /home/akhmad/pajak/ directory that have the name pajak.
Config you need to give attention is ExecStart, and WorkingDirectory
- ExecStart should be point to the executable binary, just like how you usually run the app directly. In my example above, i have env HTTP_PORT=":8080" that will be passed to the app as HTTP Port to access the app.
- WorkingDirectory here will be relative path for the app. It’s not depends to the binary file you have, so you can change it anywhere you want. I have set this inside /home/akhmad/pajak/ to store a file created from the app, and to read the file from the app.
Also, any output or error from the app will be saved to syslog, you can check it with command
sudo systemctl status pajak.service
As for another configuration, you can always check the man-page of systemd service here.
After the service is ready, and have been configured, you can start the service with command
```
sudo systemctl start <file_name.service>
```
in this case, will be sudo systemctl start pajak.service
If there is an error says can’t find the service, it seems you need to reload the daemon first
```
sudo systemctl daemon-reload
```
As to make sure the service will be running at booting, make sure to run this command
```
sudo systemctl enable pajak.service
```

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