Linuxulator: running one's own small Linux in FreeBSD?

[JB]

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Monday, February 8th, 2021 at 4:00 AM, <freebsd-emulation-request at freebsd.org> wrote:

> Message: 4
>
> Date: Mon, 08 Feb 2021 02:51:55 +0000
>
> From: "Thomas Mueller" mueller6722 at twc.com
>
> To: freebsd-emulation at freebsd.org
>
> Subject: Linuxulator: running one's own small Linux in FreeBSD?
>
> Message-ID: mailman.86.1612785601.7529.freebsd-emulation at freebsd.org
>
> Is it possible to run one's own little Linux in FreeBSD by null-mounting directory or partition on /compat/linux?
>
> I am thinking in particular of my own cross-compiled version (from FreeBSD or NetBSD on amd64 aka x86_64) still in infancy, with busybox or otherwise?
>
> This busybox is cross-compiled for Linux (i486-linux-musl or x86_64-linux-musl).
>
> Currently, this is on UFS2 aka ffsv2 file system.
>
> Would the Linux C library have to be glibc, or could it be uClibc-ng or (more likely) musl?
>
> I would want to be able to try with more than one infant Linux installation (one at a time), hence the desire to null-mount on /compat/linux rather than copying to /compat/linux.
>
> Tom

If it's just a local directory, you can use `sysctl' to tell the kernel what the emulation path is:

sysctl compat.linux.emul_path=/foo/bar

Then restart the `linux' service.