[dm-crypt] re-format existing luks partition

Robert Nichols rnicholsNOSPAM at comcast.net
Fri Nov 22 15:19:33 CET 2013


On 11/22/2013 05:49 AM, shmick at riseup.net wrote:
>
>
> Ondrej Kozina:
>> On 11/22/2013 09:26 AM, shmick at riseup.net wrote:
>>> can i re-format an existing luks partition (as the same /dev/sda[x] and
>>> simply re-copy an fsarchive operating system backup straight to it
>>> without anything further required ?
>>
>> There's an offline cryptsetup-reencrypt tool in cryptsetup 1.5.0 and
>> later. It's really offline so the device needs to umnouted before
>> reencrypting.
>>
>> Also you should consider shrinking the filesystem residing on the luks
>> device (and after that also the device) before actual reencryption. It
>> makes reencryption sector-by-sector no matter if it is used by
>> filessytem or not.
>
> thank you for the advice
>
>>
>> Also there are some fixes ready for reencryption tool on the way so you
>> may be also interested waiting for 1.6.3 release in coming weeks.
>
> i shall wait around for some updates
> just finally as an aside, is this method truly safe compared to starting
> again ?

Safer and simpler just to start over with a luksFormat, as you proposed.

-- 
Bob Nichols     "NOSPAM" is really part of my email address.
                 Do NOT delete it.



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