On Fri, May 08, 2026 at 01:40:47AM +1000, Tom via Dng wrote:
> On 5/5/2026 14:07, Ralph Ronnquist via Dng wrote:
> > On Tue, May 05, 2026 at 11:55:07AM +1000, Tom via Dng wrote:
> > > I'm having trouble trying to enable binfmt_misc on Excalibur so I can run
> > > multi-platform docker builds.
> > >
> > > I previously had it working on Daedalus by running
> > >
> > > # apt install binfmt-support qemu-user-static
> > >
> > > # ls /proc/sys/fs/binfmt_misc/
> > > python3.11 qemu-alpha qemu-armeb qemu-hexagon qemu-loongarch64
> > > qemu-microblaze qemu-mips64 qemu-mipsel qemu-mipsn32el qemu-ppc64
> > > qemu-riscv32 qemu-s390x qemu-sh4eb qemu-sparc32plus qemu-xtensa
> > > register
> > > qemu-aarch64 qemu-arm qemu-cris qemu-hppa qemu-m68k qemu-mips
> > > qemu-mips64el qemu-mipsn32 qemu-ppc qemu-ppc64le qemu-riscv64 qemu-sh4
> > > qemu-sparc qemu-sparc64 qemu-xtensaeb status
> > >
> > >
> > > When I try the same on a new Excalibur install I don't see the binfmt_misc
> > > enabled.
> > >
> > > # ls /proc/sys/fs/binfmt_misc/
> > > python3.13 register status
> >
> > Yes, you have to install "qemu-user" rather, and then register target
> > archs from /usr/share/qemu/binfmt.d/ by hand, like
> >
> > # cat /usr/share/qemu/binfmt.d/qemu-aarch64.conf > /proc/sys/fs/binfmt_misc/register
> >
> > hth
> >
> > Ralph.
> Thanks Ralph. Adding this script into /etc/boot.d/binfmt_misc with execute
> bit set appears to get the job done and registers on system boot through the
> /etc/init.d/rc.local service.
>
> It also needs the binfmt-support package installed.
>
> ---8<---
> #!/bin/sh -e
>
> if test -d /usr/share/qemu/binfmt.d ; then
> find /usr/share/qemu/binfmt.d/ -type f -name 'qemu-*.conf' ! -name
> "qemu-$(uname -m).conf" -print0 | xargs -0 -I binfmt-file cat binfmt-file >
> /proc/sys/fs/binfmt_misc/register
> fi
> ---8<---
>
> I found out the hard way that linux doesn't like the binfmt of the host
> architecture to be registered :D, hence the `uname -m`. Thankfully grub
> recovery was available to fix that in single user mode.
.. been there, done that :) I should probably have warned about that.
Ralph.
>
> Tom
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Re: [DNG] How to enable binfmt_misc…
