Date: Sun, 11 Jun 2017 02:13:37 +0200 From: Willem Jan Withagen <wjw@digiware.nl> To: Miroslav Lachman <000.fbsd@quip.cz>, Steven Hartland <killing@multiplay.co.uk>, freebsd-jail@freebsd.org Subject: Re: Passing a limited amount of disk devices to jails Message-ID: <46f93966-655a-84ef-181d-6586c18d77c7@digiware.nl> In-Reply-To: <593AAEBC.7050701@quip.cz> 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>
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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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