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)