64 bit linux binary support

[Alejandro Imass]

On Thu, Jan 14, 2016 at 9:53 AM, William A. Mahaffey III <wam at hiwaay.net> wrote:
> On 01/14/16 08:27, Alejandro Imass wrote:
>>
>> On Thu, Jan 14, 2016 at 1:49 AM, Malcolm Matalka <mmatalka at gmail.com>
>> wrote:
>>>
>>> Alejandro Imass <aimass at yabarana.com> writes:
>>>
>>>> On Wed, Jan 13, 2016 at 10:56 AM, William A. Mahaffey III
>>>> <wam at hiwaay.net> wrote:
>>>>>
>>>>>

[...]

>> My response is pretty clear: Docker is pretty much like FreeBSD Jails
>> so why not use FBSD Jails (e.g. with EzJail) in the first place
>> instead of going through the trouble of getting a Linux-like jail
>> system to run on FreeBSD. And if you want/need Docker so bad then it
>> would probably be better to run on Linux to begin with.
>>

[...]

>
> Hmmmm .... It's not so clear to me, but that might be a deficiency @ my end
> :-/. I would like to run 64-bit binaries compiled on/for linux boxen
> (specifically CentOS/RHEL 6) on my FreeBSD boxen, currently 3 in number, all
> various AMD64 CPUs, all running 9.3R. My question only involved docker to
> the extent that the docker wiki page alludes to apparently newly available
> (as of last summer) 64-bit linux binary support, which is what I am really
> interested in.
>

Perhaps you should look into bhyve, the FBSD Hypervisor

> I *AM* (separately) interested in docker, for various reasons. Specifically,
> I would want to use it as a lightweight VM system, which I *think* works
> under Linux. I.e. you can run a container of a non-native OS if it is CPU
> compatible w/ the host CPU.

AFAIK this is not the case. The reason Docker is lightweight to begin
with is because:
"Containers running on a single machine all share the same operating
system kernel so they start instantly and make more efficient use of
RAM"

Where did you get this info about Docker being able to run a different OS?

As I see it, Docker is nothing more than a copy of the FBSD Jail
system ported to Linux and with some sophistications that make it easy
to manage the images.

Most of this can be done with FBSD Jails and especially with things like EzJail.

> As I understand things, that is not feasible w/
> jails, although I have found some URL's which claim otherwise. Clarification
> on that point would be welcome as well. I have asked before & been told it
> was *NOT* feasible, but maybe things have changed or I am missing something.
> TIA & have a good one.
>

IMO virtualization is not lightweight by definition. So you either
virtualize fully or pseudo-virtualize with chroot-like systems.
In this perspective I see Docker as nothing more than a sophisticated
chroot system just like FBSD Jails, only Linux-based and less mature
;-)

Best,
Alejandro Imass