systemd systemd-user-sessions.service 8 systemd-user-sessions.service systemd-user-sessions Permit user logins after boot, prohibit user logins at shutdown systemd-user-sessions.service /usr/lib/systemd/systemd-user-sessions systemd-user-sessions.service is a service that controls user logins through pam_nologin8. After basic system initialization is complete, it removes /run/nologin, thus permitting logins. Before system shutdown, it creates /run/nologin, thus prohibiting further logins. systemd1 systemd-logind.service8 pam_nologin8