Is it possible to run Linux devuan on freebsd headless (chroot / vm)?

H

honeybear

Hello,

I have a AMD Ryzen 8 core, with good power. However I would like to run linux on it, on a chroot base rootfs.
Meaning using the classic base, without adding more crap. chroot is king.

Is it possible ?

best regards
 
You might be able to get something "devuan like" going in a linux jail; however, this will not be linux - it will be running on FreeBSD's linux emulation layer.
see https://wiki.freebsd.org/LinuxJails

If you don't mind an "opaque" disk image, you could use bhyve() to get an actual vm going. There's a bunch of helper tools to set this up, if you don't want to do it on your own - sysutils/vm-bhyve for example. It'll run headless, but you'll be able to use vnc to connect to its console.
 
you mean the kernel freebsd is running on rootfs, of Linux. It is compatible in terms of binary?
kernel freebsd with a rootfs linux?
 
drhowarddrfine said:
What is this Linux jail? Is this actually a FreeBSD jail running Linux?
Click to expand...
The terminology is not consistent here. In general, a so-called “Linux-Jail” on FreeBSD is not an actual jail – which would mean something using the well-known FreeBSD jail infrastructure, e.g. jls, jexec, etc. – but rather a chroot-environment in /compat/linux.

However, turning /compat/linux into a genuin jail is easily possible.
 
Holger said:
which would mean something using the well-known FreeBSD jail infrastructure,
Click to expand...
forums.freebsd.org

Setting up a (Debian) Linux jail on FreeBSD

Hi gang! Prerequisites: I am assuming that you know how to install software on FreeBSD and also have some basic understanding about FreeBSD jails. Editorial I'm going to be very honest here: I started disliking Linux for a while, and I've worked with it for a long time. For various reasons...
forums.freebsd.org forums.freebsd.org
 
Holger said:
The terminology is not consistent here. In general, a so-called “Linux-Jail” on FreeBSD is not an actual jail – which would mean something using the well-known FreeBSD jail infrastructure, e.g. jls, jexec, etc. – but rather a chroot-environment in /compat/linux.

However, turning /compat/linux into a genuin jail is easily possible.
Click to expand...
Actually, I believe you get pretty close to a full jail - if you replace some of the network related binaries, you can even get your own vnet:
forums.freebsd.org

jails - VNET and a Linux jail

So I've been poking at Linux jails in 13.0. I've managed to get a Ubuntu and Debian jail running, but now I want to take it a step further. Has anyone ever got VNET working inside of a Linux jail? I can only get so far before I start running into issues. Anyway, here's my jail.conf path =...
forums.freebsd.org forums.freebsd.org

I've used this with great success in the past. It starts like a regular jail, you use jexec to run linux binaries on demand. You seem to get jail-based process separation just like with a FreeBSD jail.
Then again, maybe someone with a bit more insight into the source code wants to chime in on whether all jail related boundaries are actually properly working in this context?
 
Hi

I did get the amd64 rootfs of devuan. Is the error due to amd64/ i686 incompatibility?
Code: 
root@bsd:/ramdisk2/ROOTFS # chroot .
chroot: /bin/csh: Exec format error
root@bsd:/ramdisk2/ROOTFS # uname -a

root@bsd:/ramdisk2/ROOTFS # uname -a
FreeBSD bsd 13.0-RELEASE FreeBSD 13.0-RELEASE #0 releng/13.0-n244733-ea31abc261f: Fri Apr  9 04:04:45 UTC 2021     [email]root@releng1.nyi.freebsd.org[/email]:/usr/obj/usr/src/i386.i386/sys/GENERIC  i386
 
Don't try to to run 64 bit code on an 32 bit OS, that's not possible. You can run 32 bit code on a 64 bit OS though. Why are you running a 32 bit OS on a CPU that's capable of running 64 bit?

And keep in mind that 13.0-RELEASE is end-of-life and not supported anymore.
 
I just tried DEVUAN 686 ... so x86 but error is still same:
Code: 
root@bsd:/ramdisk2/ROOTFS # chroot .
ELF binary type "0" not known.
ELF binary type "0" not known.
chroot: /bin/csh: Exec format error
 
honeybear said:
chroot: /bin/csh: Exec format error
Click to expand...
This might be caused by a common mistake: you won't have csh in your chroot shell. You need to specify an alternative (linux) shell. You will also need to make sure, that linux compatibility is available (relevant kernel modules need to be loaded):
Code: 
service linux onestart
chroot /path/to/jail /bin/bash
 
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