binfmt.d(5) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | CONFIGURATION FORMAT | CONFIGURATION DIRECTORIES AND PRECEDENCE | EXAMPLE | SEE ALSO | NOTES | COLOPHON

BINFMT.D(5)                       binfmt.d                       BINFMT.D(5)

NAME         top

       binfmt.d - Configure additional binary formats for executables at
       boot

SYNOPSIS         top

       /etc/binfmt.d/*.conf

       /run/binfmt.d/*.conf

       /usr/lib/binfmt.d/*.conf

DESCRIPTION         top

       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         top

       Each file contains a list of binfmt_misc kernel binary format rules.
       Consult the kernel's binfmt-misc.rst[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 ; and # as delimiter in binary format
       rules.

CONFIGURATION DIRECTORIES AND PRECEDENCE         top

       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). 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 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. If the vendor configuration file is
       included in the initrd image, the image has to be regenerated.

EXAMPLE         top

       Example 1. /etc/binfmt.d/wine.conf example:

           # Start WINE on Windows executables
           :DOSWin:M::MZ::/usr/bin/wine:

SEE ALSO         top

       systemd(1), systemd-binfmt.service(8), systemd-delta(1), wine(8)

NOTES         top

        1. binfmt-misc.rst
           https://www.kernel.org/doc/html/latest/admin-guide/binfmt-misc.html

COLOPHON         top

       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 2020-11-01.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2020-11-01.)  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 im‐
       provements to the information in this COLOPHON (which is not part of
       the original manual page), send a mail to man-pages@man7.org

systemd 247                                                      BINFMT.D(5)

Pages that refer to this page: 30-systemd-environment-d-generator(7)systemd.directives(7)systemd.index(7)systemd-binfmt(8)systemd-binfmt.service(8)