Mount order for ZFS, jails, and nullfs

[krad]

On 24 September 2010 18:52, krad <kraduk at gmail.com> wrote:

>
>
> On 24 September 2010 17:03, Torbjorn Granlund <tg at gmplib.org> wrote:
>
>> In jails, I'd like a local ZFS /, a read-only nullfs-mounted /usr, and a
>> local /usr/local.  (I'd also have read-only nullfs-mounted /bin, /lib,
>> /libexec, but let's forget about that for now.)
>>
>> This way, I can upgrade the master /usr once, in one place, and have all
>> jails inherit it.  And my dear jail inmates can install anything in
>> /usr/local (such as their favourite packages/ports).
>>
>> I.e., things should look like this:
>>
>> /myjail/                zfs
>> /myjail/usr             nullfs ro
>> /myjail/usr/local       zfs
>>
>> There is no problem to make this happen by issuing a handful of commands
>> manually after boot, but I cannot seem to get it to work automatically,
>> with existing boot mechanism.  The problem is that the mount of /usr
>> will be attempted before ZFS has mounted /myjail, the jail's root.
>>
>> ZFS maintains its own mount table.  It is possible to disable the
>> automated mounting in ZFS by specifying the pseudo mountpoint "legacy",
>> and then--according to the FreeBSD manual--mount it with mount(8).
>> Unfortunately, FreeBSD's mount seems unable to perform mounts of ZFS
>> volumes.
>>
>> How can I achieve the result I want after a reboot?
>>
>>
>> (The reply "use ezjail!" is not the right one.  :-) It does not do what
>> I want to do.  I dislike its symlink forest, and that it creates just
>> one ZFS filesystem for the entire jail.)
>>
>> --
>> Torbjörn
>> _______________________________________________
>> freebsd-questions at freebsd.org mailing list
>> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
>> To unsubscribe, send any mail to "
>> freebsd-questions-unsubscribe at freebsd.org"
>>
>
>
> use zfs mount/imount
>

whops s/i/u/