1BINFMT.D(5) binfmt.d BINFMT.D(5)
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6 binfmt.d - Configure additional binary formats for executables at boot
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9 /etc/binfmt.d/*.conf
10 /run/binfmt.d/*.conf
12 /usr/lib/binfmt.d/*.conf
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16 At boot, systemd-binfmt.service(8) reads configuration files from the
17 above directories to register in the kernel additional binary formats
18 for executables.
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21 Each file contains a list of binfmt_misc kernel binary format rules.
22 Consult the kernel's binfmt-misc.rst[1] documentation file for more
23 information on registration of additional binary formats and how to
24 write rules.
25 Empty lines and lines beginning with ; and # are ignored. Note that
27 this means you may not use ; and # as delimiter in binary format rules.
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30 Configuration files are read from directories in /etc/, /run/,
31 /usr/local/lib/, and /usr/lib/, in order of precedence, as listed in
32 the SYNOPSIS section above. Files must have the ".conf" extension.
33 Files in /etc/ override files with the same name in /run/,
34 /usr/local/lib/, and /usr/lib/. Files in /run/ override files with the
35 same name under /usr/.
36 All configuration files are sorted by their filename in lexicographic
38 order, regardless of which of the directories they reside in. If
39 multiple files specify the same option, the entry in the file with the
40 lexicographically latest name will take precedence. Thus, the
41 configuration in a certain file may either be replaced completely (by
42 placing a file with the same name in a directory with higher priority),
43 or individual settings might be changed (by specifying additional
44 settings in a file with a different name that is ordered later).
45 Packages should install their configuration files in /usr/lib/
47 (distribution packages) or /usr/local/lib/ (local installs). Files in
48 /etc/ are reserved for the local administrator, who may use this logic
49 to override the configuration files installed by vendor packages. It is
50 recommended to prefix all filenames with a two-digit number and a dash,
51 to simplify the ordering of the files.
52 If the administrator wants to disable a configuration file supplied by
54 the vendor, the recommended way is to place a symlink to /dev/null in
55 the configuration directory in /etc/, with the same filename as the
56 vendor configuration file. If the vendor configuration file is included
57 in the initrd image, the image has to be regenerated.
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60 Example 1. /etc/binfmt.d/wine.conf example:
61 # Start WINE on Windows executables
63 :DOSWin:M::MZ::/usr/bin/wine:
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66 systemd(1), systemd-binfmt.service(8), systemd-delta(1), wine(8)
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69 1. binfmt-misc.rst
70 https://www.kernel.org/doc/html/latest/admin-guide/binfmt-misc.html
71systemd 249 BINFMT.D(5)