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A comment on Running containers without Docker. Parent comment

Re:Running containers without Docker by icebraining on Wednesday October 26, 2016 @06:12PM (#12801154)
Docker doesn't use LXC anymore[1]. The reason you need a VM is to get the Linux kernel, not LXC, and the reason you need that is because the macOS kernel (Darwin) doesn't have the necessary containerization features. On FreeBSD, for example, Docker runs natively, without a VM.

[1] https://www.infoq.com/news/2014/03/docker_0_9

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Re:Running containers without Docker by fnj on Wednesday October 26, 2016 @08:33PM (#12802011)
If MacOS doesn't have certain linux kernel features, neither does FreeBSD. How can Docker run on FreeBSD when FreeBSD has no cgroups? I think you misread/misinterpreted your reference.
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Re:Running containers without Docker by 2trill2spill on Wednesday October 26, 2016 @10:03PM (#12802382)
> How can Docker run on FreeBSD when FreeBSD has no cgroups? I think you misread/misinterpreted your reference.

FreeBSD can run 64 bit and 32 bit Linux binaries via it's Linux emulator[1]. Plus FreeBSD has had containers since FreeBSD 4 which was released in March of 2000, except containers on FreeBSD are called jails.

> If MacOS doesn't have certain linux kernel features, neither does FreeBSD.

Just because one operating system doesn't have a feature that does not mean a different operating system does not have that feature.

[1] https://www.freebsd.org/doc/handbook/linuxemu.html

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Re:Running containers without Docker by indexerror on Wednesday October 26, 2016 @11:12PM (#12802656)
Jails are considerably different than containers. Jails are more like chroot jails on linux instead.

Edit: My viewpoint was focused more on the composability aspect of containers. But I stand corrected otherwise.

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Re:Running containers without Docker by 2trill2spill on Wednesday October 26, 2016 @11:52PM (#12802783)
> Jails are considerably different than containers. Jails are more like chroot jails on linux instead.

Thats incorrect both jails and "containers" are examples of OS level virtualization[1]. Instead of virtualizing the hardware you virtualize the operating system, ie system call table.

[1]: https://en.wikipedia.org/wiki/Operating-system-level_virtual...

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Re:Running containers without Docker by empthought on Wednesday October 26, 2016 @11:26PM (#12802707)
No, jails are basically containers. Docker on FreeBSD uses jails for isolation -- see the wiki page at https://wiki.freebsd.org/Docker
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Re:Running containers without Docker by tonyhb on Wednesday October 26, 2016 @09:35PM (#12802259)
xhyve and bhyve virtualization built into the BSD kernels. docker for mac now runs a tiny linux vm directly on osx
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