Adding a service permanently

systemctl enable name-of-the-service

To use Samba as an example

systemctl enable smb.service systemctl enable nmb.service systemctl start smb.service systemctl start nmb.service
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All that the first command does is create a symlink

ln -s ‘/usr/lib/systemd/system/smb.service’ ‘/etc/systemd/system/multi-user.target.wants/smb.service’
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Thus /etc/systemd/system/multi-user.target.wants contains all services that need to start automatically.