Date: Sat, 10 Jun 2017 20:41:54 -0400 From: Allan Jude <allanjude@freebsd.org> To: freebsd-jail@freebsd.org Subject: Re: Passing a limited amount of disk devices to jails Message-ID: <61b6dc73-5b73-7c5f-59d1-831d6336b4a2@freebsd.org> In-Reply-To: <46f93966-655a-84ef-181d-6586c18d77c7@digiware.nl> References: <edc6787a-256f-1027-0008-6d5dfa10d651@digiware.nl> <109608ec-2fc2-1f04-3dcc-0056f243639c@multiplay.co.uk> <77f2e146-b0c8-00ba-117b-b4385f355be6@digiware.nl> <593AAEBC.7050701@quip.cz> <46f93966-655a-84ef-181d-6586c18d77c7@digiware.nl>
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On 06/10/2017 20:13, Willem Jan Withagen wrote:
> On 9-6-2017 16:20, Miroslav Lachman wrote:
>> Willem Jan Withagen wrote on 2017/06/09 15:48:
>>> On 9-6-2017 11:23, Steven Hartland wrote:
>>>> You could do effectively this by using dedicated zfs filesystems per
>>>> jail
>>>
>>> Hi Steven,
>>>
>>> That is how I'm going to do it, when nothing else works.
>>> But then I don't get to test the part of building the ceph-cluster from
>>> raw disk...
>>>
>>> I was more thinking along the lines of tinkering with the devd.conf or
>>> something. And would appreciate opinions on how to (not) do it.
>>
>> I totally skipped devd.conf in my mind in previous reply. So maybe you
>> can really use devd.conf to allow access to /dev/adaX devices or you can
>> use ZFS zvol if you have big pool and need some smaller devices to test
>> with.
>
> I want the jail to look as much as a normal system would, and then run
> ceph-tools on them. And they would like to see /dev/{disk}....
>
> Now I have found /sbin/devfs which allows to add/remove devices to an
> already existing devfs-mount.
>
> So I can 'rule add type disk unhide' and see the disks.
> Gpart can then list partitions.
> But any of the other commands is met with an unwilling system:
>
> root@ceph-1:/ # gpart delete -i 1 ada0
> gpart: No such file or directory
>
> So there is still some protection in place in the jail....
>
> However dd-ing to the device does overwrite some stuff.
> Since after the 'dd if=/dev/zero of=/dev/ada0' gpart reports a corrupt
> gpartition.
>
> But I don't see any sysctl options to toggle that on or off
>
> --WjW
>
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>
To use GEOM tools like gpart, I think you'll need to unhide
/dev/geom.ctl in the jail
--
Allan Jude
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