Date: Tue, 31 May 2016 18:06:54 -0400 From: Allan Jude <allanjude@freebsd.org> To: freebsd-virtualization@freebsd.org Subject: Re: Running FreeBSD docker images on non-FreeBSD hosts Message-ID: <42cc8e38-733d-4750-3490-562b241b1b62@freebsd.org> In-Reply-To: <CA%2BMCM4v308E8iOzP9TCo57PO2ZqriD%2BevYh9nt6XWvLP%2BWmAUA@mail.gmail.com> References: <CA%2BMCM4v308E8iOzP9TCo57PO2ZqriD%2BevYh9nt6XWvLP%2BWmAUA@mail.gmail.com>
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On 2016-05-31 17:02, Jeff Terrell wrote: > To work around the current inability to mount volumes in FreeBSD docker, > I'd like to use a FreeBSD docker image on a non-FreeBSD host. Then I can > both run FreeBSD in a docker container and mount a volume in the container, > both of which are necessary for my purposes. > > (For background, I'm trying to do this to extend jsass, the Java SASS > compiler [1], to work on FreeBSD. I started a thread documenting this > attempt on Github [2].) > > [1] https://github.com/bit3/jsass > [2] https://github.com/bit3/jsass/issues/40 > > Unfortunately, every FreeBSD image I can find requires a FreeBSD host to > run. This requirement is rarely documented, but it is absolute, at least at > the moment. For each image matching "freebsd" on Docker Hub, I pulled the > image, ran `docker run IMAGE_NAME ls`, and the command produced the output > I expected when I ran it on my FreeBSD machine, but not when I ran it on my > iMac. (I added comments on Docker Hub to this effect, to hopefully save > others some time and spare them some confusion.) > > I'm acquainted with docker, but I don't know enough to understand why an > image would run in a container on one OS but not in a container on another > OS. I thought the whole point of docker was that, assuming the image worked > at all, it worked regardless of which host you used. So that's an > incidental question I have: what's going on here? Is it something > particular to FreeBSD's implementation of docker? > > But my main question is, what can I do to run a FreeBSD image on a > non-FreeBSD host? I'm willing to [figure out how to] build my own image if > necessary. I just don't want to go to the trouble if it's a non-starter for > some reason I don't understand. > > Solving this problem could, of course, open some avenues for others to > discover and use FreeBSD relatively painlessly, so I'm thinking it would be > helpful in general to the FreeBSD community. > > Can somebody point me in the right direction here? > > Thanks, > Yes, FreeBSD docker images will require a FreeBSD host. You can't run Mac OS X applications on a Linux box either. It is a different operating system. You may be spoiled by the ability of a FreeBSD host to run some Linux images, via the linux_compat layer. The only way to run a FreeBSD docker image on another OS would be via a VM. I am not that familiar with docker, what do you mean by 'mount of a volume in the docker' -- Allan Jude
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