How to create Systemd system service/Daemon on Linux

Let's create a systemd system service daemon. in order to create a system service/Daemon in user space we need to create this directory ~/.config/systemd/user/ if it does not exist.

If this directory does not exist then create it by:

mkdir -p  ~/.config/systemd/user/

Now, we need to creat the .service file inside the ~/.config/systemd/user/ directory. we are going to use nano text editor to do this:

nano ~/.config/systemd/user/example.service

Copy and paste the following systemd system daemon template in example.service file.

[Service]
WorkingDirectory=/usr/bin/
ExecStart=/usr/bin/syncthing
Restart=always
RestartSec=5

[Install]
WantedBy=default.target"

[!NOTE] ExecStart=/usr/bin/syncthing: of this /usr/bin/syncthing line should be the path of the program you want to run as a service. You can get path of a any program by running which program_name if you have the program installed of cause.

Then enable it by calling systemctl --user enable

example

systemctl --user enable example.service