new jail utility is available. announcement.

[krad]

On 21 July 2010 12:37, Aiza <aiza21 at comclark.com> wrote:

> Valentin Bud wrote:
>
>> On Wed, Jul 21, 2010 at 12:52 PM, Aiza <aiza21 at comclark.com> wrote:
>>
>>   Not yet, when I have a spare box I might, although I quite like using
>>>
>>>> zfs for jails as you can limit the disk usage dynamically per zfs
>>>> filesystem and I didnt see any support there yet, even basic support
>>>> like there is with ezjail would be nice.
>>>>
>>>>
>>>>  Zfs was left out because its over kill. Sparse image jails gives the
>>> same
>>> protection at a 10th of the overhead.
>>>
>>>
>>>  Hello community,
>>
>>  ZFS shouldn't be left out. Besides limiting the disk usage dynamically
>> per
>> zfs FS
>> you have another big advantage - snapshots. Suppose you want to upgrade
>> ports
>> is a jail and something goes kaboom you just revert to the previous
>> working
>> snapshot.
>>  I agree you can copy the image back and forth but zfs snapshots are
>> faster
>> and not
>> that space consuming.
>>
>
That all depends on your deltas. We do hot backups (lock, flush, snap,
unlock) of our oracle dbs on solaris with zfs snap shots. The do take up a
lot of room but thats becasue we do a lot of writes gigs a day.



>
>>  The layout that I plan to use is the following:
>>
>> storage/jails
>>                  |>storage/jails/group1
>>                  |                                 |
>>                  |
>> |>storage/jails/group1/jail1
>>                  |
>> |>storage/jails/group1/jail2
>>                  |
>>                  |>storage/jails/group2
>>                  |                                 |> ...
>>                  |
>>
>> Group can be any kind of characteristic you want to take into account
>> regarding
>> those jails (eg. group1 - mail servers, group2 - web servers, groupX -
>> companyY, etc.).
>> You can also go with more levels of depth but for me it's enough.
>>
>> This way if your server doesn't handle all the jails you have running,
>> simply
>> buy new hardware, install FBSD (or just copy the ZFS root container over
>> to
>> the new
>> system) and migrate the jails over.
>>
>> I am waiting for network stack virtualization to come out and dreaming
>> about
>> live jails
>> migration in the future of FBSD :).
>>
>> I would like you to reconsider ZFS support and thanks for qjail :).
>>
>> a great day,
>> v
>>
>
> What you are doing behind the jail system back using zfs, qjail does with
> the -z zone option right up front. And the archive and restore of qjail
> jails is less than 3 seconds right now. How much faster does it need to be?
>
>
>
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>

that depends on how much data is in the jail surely.