Linux-hostnamectl

NAME
hostnamectl - Control the system hostname

SYNOPSIS
hostnamectl [OPTIONS…] {COMMAND}

DESCRIPTION
hostnamectl may be used to query and change the system hostname and related settings.
This tool distinguishes three different hostnames: the high-level “pretty” hostname which might include all kinds of special characters
(e.g. “Lennart’s Laptop”), the static hostname which is used to initialize the kernel hostname at boot (e.g. “lennarts-laptop”), and the
transient hostname which is a default received from network configuration. If a static hostname is set, and is valid (something other
than localhost), then the transient hostname is not used.

Note that the pretty hostname has little restrictions on the characters used, while the static and transient hostnames are limited to the
usually accepted characters of Internet domain names.

The static hostname is stored in /etc/hostname, see hostname(5) for more information. The pretty hostname, chassis type, and icon name
are stored in /etc/machine-info, see machine-info(5).

Use systemd-firstboot(1) to initialize the system host name for mounted (but not booted) system images.

OPTIONS
The following options are understood:

–no-ask-password

Do not query the user for authentication for privileged operations.

–static, --transient, --pretty

If status is used (or no explicit command is given) and one of those fields is given, hostnamectl will print out just this selected hostname.

If used with set-hostname, only the selected hostname(s) will be updated. When more than one of those options is used, all the
specified hostnames will be updated.

-H, --host=

Execute the operation remotely. Specify a hostname, or a username and hostname separated by “@”, to connect to. The hostname may
optionally be suffixed by a container name, separated by “:”, which connects directly to a specific container on the specified host.
This will use SSH to talk to the remote machine manager instance. Container names may be enumerated with machinectl -H HOST.

-M, --machine=

Execute operation on a local container. Specify a container name to connect to.

-h, --help

       Print a short help text and exit.

–version

Print a short version string and exit.

The following commands are understood:

status

Show current system hostname and related information.

set-hostname NAME

set-hostname NAME
Set the system hostname to NAME. By default, this will alter the pretty, the static, and the transient hostname alike; however, if
one or more of --static, --transient, --pretty are used, only the selected hostnames are changed. If the pretty hostname is being
set, and static or transient are being set as well, the specified hostname will be simplified in regards to the character set used
before the latter are updated. This is done by replacing spaces with “-” and removing special characters. This ensures that the
pretty and the static hostname are always closely related while still following the validity rules of the specific name. This
simplification of the hostname string is not done if only the transient and/or static host names are set, and the pretty host name is
left untouched.

Pass the empty string “” as the hostname to reset the selected hostnames to their default (usually “localhost”).

-- 设置主机名称，重启后有效果
[root@spark01 ~]# hostnamectl set-hostname spark03
-- 重启后名称由 spark01变成为spark03
[root@spark03 ~]# hostname
spark03

set-icon-name NAME

Set the system icon name to NAME. The icon name is used by some graphical applications to visualize this host. The icon name should
follow the Icon Naming Specification[1].

Pass an empty string to reset the icon name to the default value, which is determined from chassis type (see below) and possibly
other parameters.

set-chassis TYPE

Set the chassis type to TYPE. The chassis type is used by some graphical applications to visualize the host or alter user
interaction. Currently, the following chassis types are defined: “desktop”, “laptop”, “server”, “tablet”, “handset”, “watch”,
“embedded”, as well as the special chassis types “vm” and “container” for virtualized systems that lack an immediate physical
chassis.

Pass an empty string to reset the chassis type to the default value which is determined from the firmware and possibly other
parameters.

set-deployment ENVIRONMENT

Set the deployment environment description. ENVIRONMENT must be a single word without any control characters. One of the following
is suggested: “development”, “integration”, “staging”, “production”.

Pass an empty string to reset to the default empty value.

set-location LOCATION
Set the location string for the system, if it is known. LOCATION should be a human-friendly, free-form string describing the
physical location of the system, if it is known and applicable. This may be as generic as “Berlin, Germany” or as specific as “Left
Rack, 2nd Shelf”.

Pass an empty string to reset to the default empty value.

EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise.

SEE ALSO
systemd(1), hostname(1), hostname(5), machine-info(5), systemctl(1), systemd-hostnamed.service(8), systemd-firstboot(1)