freebsd stable - Feb 2015 - FreeBSD ZFS with Boot Environments (Was: 10.1-RELEASE: bsdinstall on zfs: /var and /usr on zroot/ROOT/default)

On Sun, 8 Feb 2015, Raphael Eiselstein wrote:
> Hi everyone,
>
> I recently installed a fresh 10.1-RELEASE (amd64) using bsdinstalls
> zfs-setup on two mirrored disks.
>
> As I wanted to move zroot/usr/home to zroot/home I noticed that
> everything from /usr and /var is in the "/" mount
(zroot/ROOT/default)
>
> The "mountpoint" property of zroot/var and zroot/usr seems
correct but
> in fact it is not mounted there.
>
> See http://sigsys.de/files/freebsd_101_zfs_root_fail_screenshot.jpg
> (sorry, had no networking at this moment, so just a regular screenshot)
>
> Is this a known bug?
> How can this be circumvented?
> How can I "fix" this?
This is not a bug and you should not fix it:
this setup uses boot environments and /var and /usr with content belongs 
to particular BE. If/when you will fork BE with, say, CURRENT, it will 
need different files, hierarchies and filesets in /usr and /var.
On the other hand, /home, /var/log, /tmp, /var/tmp et cetera live outside 
of any BE.

Good news: booting into single user you may use vi or mc :)

A.

On Sun, Feb 08, 2015 at 11:54:12PM +0300, Antony Uspensky
wrote:
> On Sun, 8 Feb 2015, Raphael Eiselstein wrote:
> >As I wanted to move zroot/usr/home to zroot/home I noticed that
> >everything from /usr and /var is in the "/" mount
(zroot/ROOT/default)
> >The "mountpoint" property of zroot/var and zroot/usr seems
correct but
> >in fact it is not mounted there.
> This is not a bug and you should not fix it:
> this setup uses boot environments and /var and /usr with content
This was not obvious (for me). I use ZFS since 8.x with FreeBSD 
(with manual setup of zroot / gptzfs-bootloader etc) and with Debian 
wheezy for a while so I'm not "new" to ZFS.

Having a BE is cool stuff I guess, but it lacks some documentation (at
least in FreeBSD handbook).

I found just a side note about "boot environments" in the
"FreeBSD
handbook":
https://www.freebsd.org/doc/handbook/bsdinstall-partitioning.html

Is there some "official" documentation about boot environments?

Searching the web for 'site:freebsd.org zfs "boot
environment"' I found
https://forums.freebsd.org/threads/howto-freebsd-zfs-madness.31662/ 
So is this "official" or mainstream or just a experimental hack or a
poc?

Regards
Raphael
-- 
Raphael Eiselstein <rabe at uugrn.org> 
PGP                   4E63 5307 6F6A 036D 518D  3C4F 75EE EA14 F625 DB4E
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