|
HTML rendering created 2026-01-16 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. |
|
|
NAME | SYNOPSIS | DESCRIPTION | CONFIGURATION DIRECTORIES AND PRECEDENCE | OPTIONS | SEE ALSO | NOTES | COLOPHON |
|
|
|
SYSEXT.CONF(5) sysext.conf SYSEXT.CONF(5)
sysext.conf, confext.conf, sysext.conf.d, confext.conf.d -
Configuration files for systemd-sysext
/etc/systemd/sysext.conf
/etc/systemd/sysext.conf.d/*.conf
/run/systemd/sysext.conf
/run/systemd/sysext.conf.d/*.conf
/usr/lib/systemd/sysext.conf
/usr/lib/systemd/sysext.conf.d/*.conf
/etc/systemd/confext.conf
/etc/systemd/confext.conf.d/*.conf
/run/systemd/confext.conf
/run/systemd/confext.conf.d/*.conf
/usr/lib/systemd/confext.conf
/usr/lib/systemd/confext.conf.d/*.conf
These configuration files control the behavior of
systemd-sysext(8) and systemd-confext(8). They are especially
useful when needing to customize the behavior of the respective
extension service units.
The default configuration is set during compilation, so
configuration is only needed when it is necessary to deviate from
those defaults. The main configuration file is loaded from one of
the listed directories in order of priority, only the first file
found is used: /etc/systemd/, /run/systemd/,
/usr/local/lib/systemd/ [1], /usr/lib/systemd/. The vendor version
of the file contains commented out entries showing the defaults as
a guide to the administrator. Local overrides can also be created
by creating drop-ins, as described below. The main configuration
file can also be edited for this purpose (or a copy in /etc/ if it
is shipped under /usr/), however using drop-ins for local
configuration is recommended over modifications to the main
configuration file.
In addition to the main configuration file, drop-in configuration
snippets are read from /usr/lib/systemd/*.conf.d/,
/usr/local/lib/systemd/*.conf.d/, and /etc/systemd/*.conf.d/.
Those drop-ins have higher precedence and override the main
configuration file. Files in the *.conf.d/ configuration
subdirectories are sorted by their filename in lexicographic
order, regardless of in which of the subdirectories they reside.
When multiple files specify the same option, for options which
accept just a single value, the entry in the file sorted last
takes precedence, and for options which accept a list of values,
entries are collected as they occur in the sorted files.
When packages need to customize the configuration, they can
install drop-ins under /usr/. Files in /etc/ are reserved for the
local administrator, who may use this logic to override the
configuration files installed by vendor packages. Drop-ins have to
be used to override package drop-ins, since the main configuration
file has lower precedence. It is recommended to prefix all
filenames in those subdirectories with a two-digit number and a
dash, to simplify the ordering. This also defines a concept of
drop-in priorities to allow OS vendors to ship drop-ins within a
specific range lower than the range used by users. This should
lower the risk of package drop-ins overriding accidentally
drop-ins defined by users. It is recommended to use the range
10-40 for drop-ins in /usr/ and the range 60-90 for drop-ins in
/etc/ and /run/, to make sure that local and transient drop-ins
take priority over drop-ins shipped by the OS vendor.
To disable a configuration file supplied by the vendor, the
recommended way is to place a symlink to /dev/null in the
configuration directory in /etc/, with the same filename as the
vendor configuration file.
The following options are understood in both the "[SysExt]" and
"[ConfExt]" sections:
Section Options
Mutable=
Set the mutable mode for system extensions. Takes one of "no",
"yes", "auto", "import", "ephemeral", or "ephemeral-import".
For details about the modes, see the --mutable= option in
systemd-sysext(8). Defaults to "no".
Added in version 259.
ImagePolicy=
Set the image policy. Takes an image policy string as
argument, as per systemd.image-policy(7). For details, see the
--image-policy= option in systemd-sysext(8).
Added in version 259.
systemd(1), systemd-sysext(8), systemd.syntax(7)
1. 💣💥🧨💥💥💣 Please note that those configuration files must
be available at all times. If /usr/local/ is a separate
partition, it may not be available during early boot, and must
not be used for configuration.
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 2026-01-16. (At that
time, the date of the most recent commit that was found in the
repository was 2026-01-16.) 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
man-pages@man7.org
systemd 260~devel SYSEXT.CONF(5)
Pages that refer to this page: systemd.directives(7), systemd.index(7), systemd-sysext(8)
|
HTML rendering created 2026-01-16 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. |
|