Using systemd as user service manager with systemctl and journalctl in userspace
Common systemd usage is to manage global linux services, that can be created/modified only with root/sudo credentials.
But systemd have the great user mode, that allow to create and control any services without sudo permissions, that runs as user owner, we simply need to add the `--user` argument.
For allow to start user services on system boot, you must one-time launch the command for needed user:
sudo loginctl enable-linger LOGIN