Date: Tue, 4 Sep 2012 10:30:09 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>, <freebsd-jail@freebsd.org>, <mm@freebsd.org>, <pjd@freebsd.org>, <jamie@freebsd.org> Subject: Re: Fixed Jail ID for ZFS -> need proper mgmt? Message-ID: <AB1DE809AA02491B865DD785C6235C9A@multiplay.co.uk> References: <alpine.BSF.2.00.1209040846530.76284@ai.fobar.qr>
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----- Original Message -----
From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>
To: <freebsd-jail@freebsd.org>; <mm@freebsd.org>; <pjd@freebsd.org>; <jamie@freebsd.org>
Sent: Tuesday, September 04, 2012 9:55 AM
Subject: Fixed Jail ID for ZFS -> need proper mgmt?
> Hi,
>
> I had been talking to someone about jail management and it turns out
> people are using jail jid=42 to always have a fixed jail ID. The
> reason as I understood is that ZFS datasets are associated by jail id
> for delegation? [I admit having no clue about the ZFS side]
>
> If this is true I feel it's a very bad idea as it makes restarting
> jails a lot harder in case they remain DYING for say a not fully
> closed TCP session.
>
> My memories are: jid are still unique and cannot be re-used, even if
> in DYING, names can be re-used and thus are not neccessarily unique.
> Jamie, can you confirm this?
>
> Seems we need to sort out one to two problems:
>
> 1) can we make sure that the jail management framework can address a
> ZFS dataset for delegation somehow and automatically do that as
> part of the startup?
>
> 2) in the case of (1) it should be possible to address jails by name
> as ZFS would be handled automatically and we would not need another
> unique identifier I guess?
> Otherwise I'd prefer for people to be able to delegate ZFS datasets
> to jail names (as well), as long as they are uniquely identifyable
> (i.e. there are no 17 jails running with a name of "filesever").
>
> Do we have documentation for the ZFS features in the man pages or
> elsewhere btw? If not we should add it.
>
> Does this make sense?
We use fixed jid's here to ensure only one copy of a jail is started.
If a jail is in a dying state you can still resurrect the it if your
looking to restart it so it not as big a deal as you may think.
Regards
Steve
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