systemd-random-seed.service, systemd-random-seed — Load and save the system random seed at boot and shutdown
systemd-random-seed.service
/usr/lib/systemd/systemd-random-seed
systemd-random-seed.service
                is a service that restores the random seed of the
                system at early-boot and saves it at shutdown. See
                random(4)
                for details. Saving/restoring the random seed across
                boots increases the amount of available entropy early
                at boot. On disk the random seed is stored in
                /var/lib/systemd/random-seed.