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NAME | SYNOPSIS | DESCRIPTION | CONFIGURATION FORMAT | CONFIGURATION DIRECTORIES AND PRECEDENCE | EXAMPLE | SEE ALSO | NOTES | COLOPHON |
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BINFMT.D(5) binfmt.d BINFMT.D(5)
binfmt.d - Configure additional binary formats for executables at
boot
/etc/binfmt.d/*.conf
/run/binfmt.d/*.conf
/usr/local/lib/binfmt.d/*.conf
/usr/lib/binfmt.d/*.conf
At boot, systemd-binfmt.service(8) reads configuration files from
the above directories to register in the kernel additional binary
formats for executables.
Each file contains a list of binfmt_misc kernel binary format
rules. Consult the kernel's Kernel Support for miscellaneous
Binary Formats (binfmt_misc)[1] documentation file for more
information on registration of additional binary formats and how
to write rules.
Empty lines and lines beginning with ";" and "#" are ignored.
Note that this means you may not use those symbols as the
delimiter in binary format rules.
Configuration files are read from directories in /etc/, /run/,
/usr/local/lib/, and /usr/lib/, in order of precedence, as listed
in the SYNOPSIS section above. Files must have the ".conf"
extension. Files in /etc/ override files with the same name in
/run/, /usr/local/lib/, and /usr/lib/. Files in /run/ override
files with the same name under /usr/.
All configuration files are sorted by their filename in
lexicographic order, regardless of which of the directories they
reside in. If multiple files specify the same option, the entry
in the file with the lexicographically latest name will take
precedence. Thus, the configuration in a certain file may either
be replaced completely (by placing a file with the same name in a
directory with higher priority), or individual settings might be
changed (by specifying additional settings in a file with a
different name that is ordered later).
Packages should install their configuration files in /usr/lib/
(distribution packages) or /usr/local/lib/ (local installs) [2].
Files in /etc/ are reserved for the local administrator, who may
use this logic to override the configuration files installed by
vendor packages.
It is recommended to prefix all filenames with a two-digit number
and a dash to simplify the ordering. It is recommended to use the
range 10-40 for configuration files in /usr/ and the range 60-90
for configuration files in /etc/ and /run/, to make sure that
local and transient configuration files will always take priority
over configuration files shipped by the OS vendor.
If the administrator wants 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. If the vendor
configuration file is included in the initrd image, the image has
to be regenerated.
Example 1. /etc/binfmt.d/wine.conf example:
# Start WINE on Windows executables
:DOSWin:M::MZ::/usr/bin/wine:
systemd(1), systemd-binfmt.service(8), systemd-delta(1), wine(8)
1. Kernel Support for miscellaneous Binary Formats (binfmt_misc)
https://docs.kernel.org/admin-guide/binfmt-misc.html
2. 💣💥🧨💥💥💣 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 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
man-pages@man7.org
systemd 257~devel BINFMT.D(5)
Pages that refer to this page: systemd.directives(7), systemd.index(7), systemd-binfmt.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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