BINFMT.D(5) binfmt.d BINFMT.D(5)
NAME
binfmt.d - Configure additional binary formats for executables at boot
SYNOPSIS
/etc/binfmt.d/*.conf
/run/binfmt.d/*.conf
/usr/lib/binfmt.d/*.conf
DESCRIPTION
At boot, systemd-binfmt.service(8) reads configuration files from the above directories to
register in the kernel additional binary formats for executables.
CONFIGURATION FORMAT
Each file contains a list of binfmt_misc kernel binary format rules. Consult
binfmt_misc.rst[1] 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 ; and # as delimiter in binary format rules.
CONFIGURATION DIRECTORIES AND PRECEDENCE
Configuration files are read from directories in /etc/, /run/, and /usr/lib/, in order of
precedence. Each configuration file in these configuration directories shall be named in
the style of filename.conf. Files in /etc/ override files with the same name in /run/ and
/usr/lib/. Files in /run/ override files with the same name in /usr/lib/.
Packages should install their configuration files in /usr/lib/. Files in /etc/ are
reserved for the local administrator, who may use this logic to override the configuration
files installed by vendor packages. 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. It is recommended to prefix all filenames with a two-digit
number and a dash, to simplify the ordering of the files.
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.
EXAMPLE
Example 1. /etc/binfmt.d/wine.conf example:
# Start WINE on Windows executables
:DOSWin:M::MZ::/usr/bin/wine:
SEE ALSO
systemd(1), systemd-binfmt.service(8), systemd-delta(1), wine(8)
NOTES
1. binfmt_misc.rst
https://www.kernel.org/doc/Documentation/admin-guide/binfmt-misc.rst
systemd 219 BINFMT.D(5)
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