Ubuntu Linux Jail on FreeBSD 12.2-Release

Re:Ubuntu Linux Jail on FreeBSD 12.2-Release by justincormack on Monday November 02, 2020 @03:45PM (#24973064)

Every couple of years people express interest but no one has ever done the work. It is very much doable as the original port showed, and the zfs driver already exists for image layering as that works on Linux.

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Re:Ubuntu Linux Jail on FreeBSD 12.2-Release by takeda on Monday November 02, 2020 @04:51PM (#24973860)

I think that the people who work on it have goal to run linux in it and that causes the project to be more complex than it should. For example if you use Linux on ARM you still need to build new containers, because the x86_64 won't work there, so why it should be different with FreeBSD? Yes, it would be great to run the same docker images on FreeBSD, but that should be a later step, and stuff like described in this wiki, could be used to accomplish that.

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Re:Ubuntu Linux Jail on FreeBSD 12.2-Release by danieldk on Tuesday November 03, 2020 @03:26AM (#24977606)

For example if you use Linux on ARM you still need to build new containers, because the x86_64 won't work there,

Actually, it would with qemu user-mode emulation. This can be done transparently with binfmt_misc, which is a one or two-liner on many distributions.

BuildKit now can now also automatically without any additional setup:

https://github.com/moby/buildkit/pull/1516

But I do understand your point, Linux emulation on FreeBSD may be incomplete/incorrect in places, so you have to address to problems at the same time. Unfortunately, I think this is also what people would expect from Docker support - the ability to pull arbitrary images.

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Re:Ubuntu Linux Jail on FreeBSD 12.2-Release by whizzter on Tuesday November 03, 2020 @04:47AM (#24978068)

> But I do understand your point, Linux emulation on FreeBSD may be incomplete/incorrect in places, so you have to address to problems at the same time. Unfortunately, I think this is also what people would expect from Docker support - the ability to pull arbitrary images.

This is really an important point, MS failed to get WSL1 good enough so WSL2 was just a plain Linux kernel being virtualized. Maybe running a some partially virtualized linux kernel(Linux already has modes for this?) via bhyve relying on a host FreeBSD filesystem (using the already developed layering) might be an feasible approach that requires less Linux API chasing while retaining the "native" FS advantage at the expense of some extra memory (bhyve) ?

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Re:Ubuntu Linux Jail on FreeBSD 12.2-Release by trasz on Tuesday November 03, 2020 @04:57AM (#24978115)

From what I understand, with qemu-usermode you're still risking incompatibilities, as QEmu needs to be able to handle the syscalls to translate (or 'transmarshal', if that's a word) each of the syscalls.

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Re:Ubuntu Linux Jail on FreeBSD 12.2-Release by trasz on Tuesday November 03, 2020 @05:32AM (#24978285)

There has been some work done: https://reviews.freebsd.org/D21570. It appears stalled, though.

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