This section summarizes all the options available in
operating-system declarations (see Using the Configuration System).
This is the data type representing an operating system configuration. By that, we mean all the global system configuration, not per-user configuration (see Using the Configuration System).
The package object of the operating system kernel to use24.
The package object of the Hurd to be started by the kernel. When this
field is set, produce a GNU/Hurd operating system. In that case,
kernel must also be set to the
microkernel the Hurd runs on.
Warning: This feature is experimental and only supported for disk images.
A list of objects (usually packages) to collect loadable kernel modules
List of strings or gexps representing additional arguments to pass on
the command-line of the kernel—e.g.,
The system bootloader configuration object. See Bootloader Configuration.
This is the label (a string) as it appears in the bootloader’s menu entry. The default label includes the kernel name and version.
This field specifies the keyboard layout to use in the console. It can be
#f, in which case the default keyboard layout is used (usually
US English), or a
<keyboard-layout> record. See Keyboard Layout,
for more information.
This keyboard layout is in effect as soon as the kernel has booted. For
instance, it is the keyboard layout in effect when you type a passphrase if
your root file system is on a
luks-device-mapping mapped device
(see Mapped Devices).
Note: This does not specify the keyboard layout used by the bootloader, nor that used by the graphical display server. See Bootloader Configuration, for information on how to specify the bootloader’s keyboard layout. See X Window, for information on how to specify the keyboard layout used by the X Window System.
The list of Linux kernel modules that need to be available in the initial RAM disk. See Initial RAM Disk.
A procedure that returns an initial RAM disk for the Linux kernel. This field is provided to support low-level customization and should rarely be needed for casual use. See Initial RAM Disk.
List of firmware packages loadable by the operating system kernel.
The default includes firmware needed for Atheros- and Broadcom-based
WiFi devices (Linux-libre modules
respectively). See Hardware Considerations, for more info on
The host name.
A file-like object (see file-like objects) for use as
/etc/hosts (see Host Names in The GNU C Library
Reference Manual). The default is a file with entries for
localhost and host-name.
A list of mapped devices. See Mapped Devices.
A list of file systems. See File Systems.
A list of UUIDs, file system labels, or strings identifying devices or files to be used for “swap space” (see Memory Concepts in The GNU C Library Reference Manual). Here are some examples:
(list (uuid "4dab5feb-d176-45de-b287-9b0a6e4c01cb"))
Use the swap partition with the given UUID. You can learn the UUID of a
Linux swap partition by running
swaplabel device, where
device is the /dev file name of that partition.
(list (file-system-label "swap"))
Use the partition with label
swap. Again, the
swaplabel command allows you to view and change the label of a
Linux swap partition.
Use the file /swapfile as swap space.
(list "/dev/sda3" "/dev/sdb2")
Use the /dev/sda3 and /dev/sdb2 partitions as swap space. We recommend referring to swap devices by UUIDs or labels as shown above instead.
It is possible to specify a swap file in a file system on a mapped device (under /dev/mapper), provided that the necessary device mapping and file system are also specified. See Mapped Devices and File Systems.
List of user accounts and groups. See User Accounts.
users list lacks a user account with UID 0, a
“root” account with UID 0 is automatically added.
A list of target file name/file-like object tuples (see file-like objects). These are the skeleton files that will be added to the home directory of newly-created user accounts.
For instance, a valid value may look like this:
`((".bashrc" ,(plain-file "bashrc" "echo Hello\n")) (".guile" ,(plain-file "guile" "(use-modules (ice-9 readline)) (activate-readline)")))
A string denoting the contents of the /etc/issue file, which is displayed when users log in on a text console.
A list of packages to be installed in the global profile, which is accessible at /run/current-system/profile. Each element is either a package variable or a package/output tuple. Here’s a simple example of both:
(cons* git ; the default "out" output (list git "send-email") ; another output of git %base-packages) ; the default set
The default set includes core utilities and it is good practice to install non-core utilities in user profiles (see Invoking guix package).
A timezone identifying string—e.g.,
You can run the
tzselect command to find out which timezone
string corresponds to your region. Choosing an invalid timezone name
guix system to fail.
The name of the default locale (see Locale Names in The GNU C Library Reference Manual). See Locales, for more information.
The list of locale definitions to be compiled and that may be used at run time. See Locales.
The list of GNU libc packages whose locale data and tools are used to build the locale definitions. See Locales, for compatibility considerations that justify this option.
Configuration of the libc name service switch (NSS)—a
<name-service-switch> object. See Name Service Switch, for
A list of service objects denoting system services. See Services.
The list of “essential services”—i.e., things like instances of
host-name-service-type (see Service Reference), which are derived from the operating system definition itself.
As a user you should never need to touch this field.
Linux pluggable authentication module (PAM) services.
<setuid-program>. See Setuid Programs, for more
The contents of the /etc/sudoers file as a file-like object
This file specifies which users can use the
sudo command, what
they are allowed to do, and what privileges they may gain. The default
is that only
root and members of the
wheel group may use
When used in the lexical scope of an operating system field definition, this identifier resolves to the operating system being defined.
The example below shows how to refer to the operating system being defined in
the definition of the
(use-modules (gnu) (guix)) (operating-system ;; ... (label (package-full-name (operating-system-kernel this-operating-system))))
It is an error to refer to
this-operating-system outside an operating
Currently only the Linux-libre kernel is fully supported. Using GNU mach with the GNU Hurd is experimental and only available when building a virtual machine disk image.