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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | SYNOPSIS | DESCRIPTION | COMMANDS | OPTIONS | EXIT STATUS | SEE ALSO | NOTES | COLOPHON |
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HOSTNAMECTL(1) hostnamectl HOSTNAMECTL(1)
hostnamectl - Control the system hostname
hostnamectl [OPTIONS...] {COMMAND}
hostnamectl may be used to query and change the system hostname
and related settings.
systemd-hostnamed.service(8) and this tool distinguish 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 the user-configured
hostname (e.g. "lennarts-laptop"), and the transient hostname
which is a fallback value received from network configuration
(e.g. "node12345678"). If a static hostname is set to a valid
value, then the transient hostname is not used.
Note that the pretty hostname has little restrictions on the
characters and length used, while the static and transient
hostnames are limited to the usually accepted characters of
Internet domain names, and 64 characters at maximum (the latter
being a Linux limitation).
Use systemd-firstboot(1) to initialize the system hostname for
mounted (but not booted) system images.
The following commands are understood:
status
Show system hostname and related information. If no command
is specified, this is the implied default.
Added in version 195.
hostname [NAME]
If no argument is given, print the system hostname. If an
optional argument NAME is provided then the command changes
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 removing special characters and
spaces. 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 hostnames are set, and the pretty hostname is left
untouched.
The static and transient hostnames must each be either a
single DNS label (a string composed of 7-bit ASCII lower-case
characters and no spaces or dots, limited to the format
allowed for DNS domain name labels), or a sequence of such
labels separated by single dots that forms a valid DNS FQDN.
The hostname must be at most 64 characters, which is a Linux
limitation (DNS allows longer names).
Added in version 249.
icon-name [NAME]
If no argument is given, print the icon name of the system.
If an optional argument NAME is provided then the command
changes the 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].
Added in version 249.
chassis [TYPE]
If no argument is given, print the chassis type. If an
optional argument TYPE is provided then the command changes
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", "convertible", "server",
"tablet", "handset", "watch", "embedded", as well as the
special chassis types "vm" and "container" for virtualized
systems that lack an immediate physical chassis.
Added in version 249.
deployment [ENVIRONMENT]
If no argument is given, print the deployment environment. If
an optional argument ENVIRONMENT is provided then the command
changes the deployment environment to ENVIRONMENT. Argument
ENVIRONMENT must be a single word without any control
characters. One of the following is suggested: "development",
"integration", "staging", "production".
Added in version 249.
location [LOCATION]
If no argument is given, print the location string for the
system. If an optional argument LOCATION is provided then the
command changes the location string for the system to
LOCATION. Argument 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".
Added in version 249.
The following options are understood:
--no-ask-password
Do not query the user for authentication for privileged
operations.
Added in version 195.
--static, --transient, --pretty
If status is invoked (or no explicit command is given) and
one of these switches is specified, hostnamectl will print
out just this selected hostname.
If used with hostname, only the selected hostnames will be
updated. When more than one of these switches are specified,
all the specified hostnames will be updated.
Added in version 195.
-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 port ssh is
listening on, separated by ":", and then 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. Put IPv6 addresses in
brackets.
-M, --machine=
Execute operation on a local container. Specify a container
name to connect to, optionally prefixed by a user name to
connect as and a separating "@" character. If the special
string ".host" is used in place of the container name, a
connection to the local system is made (which is useful to
connect to a specific user's user bus: "--user
[email protected]"). If the "@" syntax is not used, the
connection is made as root user. If the "@" syntax is used
either the left hand side or the right hand side may be
omitted (but not both) in which case the local user name and
".host" are implied.
-h, --help
Print a short help text and exit.
--version
Print a short version string and exit.
--json=MODE
Shows output formatted as JSON. Expects one of "short" (for
the shortest possible output without any redundant whitespace
or line breaks), "pretty" (for a pretty version of the same,
with indentation and line breaks) or "off" (to turn off JSON
output, the default).
-j
Equivalent to --json=pretty if running on a terminal, and
--json=short otherwise.
On success, 0 is returned, a non-zero failure code otherwise.
systemd(1), hostname(1), hostname(5), machine-info(5),
systemctl(1), systemd-hostnamed.service(8), systemd-firstboot(1)
1. Icon Naming Specification
https://standards.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html
This page is part of the systemd (systemd system and service
manager) project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have
a bug report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-06-13.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
systemd 257~devel HOSTNAMECTL(1)
Pages that refer to this page: systemd-firstboot(1), hostname(5), machine-info(5), systemd.directives(7), systemd.index(7), systemd-hostnamed.service(8), systemd-machined.service(8)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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