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 2021-08-27.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2021-08-27.)  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 249                                                  BINFMT.D(5)

Pages that refer to this page: systemd-binfmt.service(8)