Run as a service on Linux

1. Create a Custom systemd Service

Create a Unit file to define a systemd service: File: /lib/systemd/system/myservice.service

[Unit]
Description=Extension Name Service
After=network.target

[Service]
User=root
WorkingDirectory=/usr/local/bin
# when using config:
# ExecStart=/usr/local/bin/super-tables-linux
# when NOT using config:
# ExecStart=/usr/local/bin/super-tables-linux –port 443 –cert yourdomain.crt –key yourdomain.key
Restart=always

[Install]
WantedBy=multi-user.target

This defines a simple service. The critical part is the ExecStart directive, which specifies the command that will be run to start the service.

2. Copy the unit file and give it permissions

sudo cp myservice.service /etc/systemd/system/myservice.service
sudo chmod 644 /etc/systemd/system/myservice.service

Start and Enable the Service

1. Once you have a unit file, you are ready to test the service:

sudo systemctl start myservice

2. Check the status of the service:

sudo systemctl status myservice

If the service is running correctly, the output should resemble the following:

● myservice.service – Example systemd service.
Loaded: loaded (/lib/systemd/system/myservice.service; enabled; vendor preset: enabled)
Active: active (running) since Tue 2018-05-01 18:17:14 UTC; 4s ago
Main PID: 16266 (bash)
Tasks: 2 Memory: 748.0K CPU: 4ms CGroup: /system.slice/myservice.service
├─16266 /bin/bash /usr/bin/test_service.sh
└─16270 sleep 30
May 01 18:17:14 localhost systemd[1]: Started Example systemd service..
May 01 18:17:14 localhost cat[16269]: Example service started at 2018-05-01 18:17:14
May 01 18:17:14 localhost bash[16266]: Looping…

3. The service can be stopped or restarted using standard `systemd` commands:

sudo systemctl stop myservice
sudo systemctl restart myservice

4. Finally, use the enable command to ensure that the service starts whenever the system boots:

sudo systemctl enable myservice

Created symlink from /etc/systemd/system/multi-user.target.wants/myservice.service to /lib/systemd/system/myservice.service

ln -s /etc/systemd/system/multi-user.target.wants/myservice.service /lib/systemd/system/myservice.service

5. Reboot your Server(Optional) and check the status of the service:

sudo systemctl status myservice

You should see that the service logged its start time immediately after booting:

● myservice.service – Example systemd service.
Loaded: loaded (/usr/lib/systemd/system/myservice.service; enabled; vendor preset: disabled)
Active: active (running) since Wed 2018-05-02 15:03:07 UTC; 48s ago
Main PID: 2973 (bash)
CGroup: /system.slice/myservice.service
├─2973 /bin/bash /usr/bin/test_service.sh
└─3371 sleep 30
May 02 15:03:07 localhost systemd[1]: Started Example systemd service..
May 02 15:03:07 localhost systemd[1]: Starting Example systemd service….
May 02 15:03:07 localhost bash[2973]: Looping…
May 02 15:03:37 localhost bash[2973]: Looping…