HOSTNAME(5) hostname HOSTNAME(5) (NAME) hostname - (SYNOPSIS) /etc/hostname (DESCRIPTION) /etc/hostname . systemd(1) sethostname(2) . (newline) . ( "#" ) . - DNS . DNS . ( DNS ) ( DNS). . "?" (cryptographic hashing) machine-id(5) . : "foobar-????-????" "foobar-92a9-061c" . hostnamectl(1) . systemd-firstboot(1) ( ) . (HOSTNAME SEMANTICS) systemd(1) : o systemd.hostname= systemd(1) : kernel-command-line(7). o <<>> (static) /etc/hostname . o (transient) DHCP : systemd-hostnamed.service(8). NetworkManager[1] systemd-networkd.service(8) . systemd-hostnamed.service(8) . o (fallback) ("archlinux"). . . . systemd . (HISTORY) /etc/hostname Debian GNU/Linux . (SEE ALSO) systemd(1), sethostname(2), hostname(1), hostname(7), machine-id(5), machine-info(5), hostnamectl(1), systemd-hostnamed.service(8), systemd- firstboot(1) (NOTES) 1. NetworkManager https://developer.gnome.org/NetworkManager/stable systemd 261.2 HOSTNAME(5)