OK. I understand. It can help: Advanced Usage https://www.suse.com/documentation/sles-12/book_sle_admin/data/sec_boot_systemd_advanced.html and https://doc.opensuse.org/documentation/leap/reference/html/book.opensuse.reference/cha.systemd.html#sec.boot.systemd.advanced and Managing temporary files with systemd-tmpfiles on Red Hat Enterprise Linux 7 https://developers.redhat.com/blog/2016/09/20/managing-temporary-files-with-systemd-tmpfiles-on-rhel7/ Thank you!