[CentOS] Best configuration for encrypted software RAID 1?

Wed May 15 16:25:39 UTC 2013
Digimer <lists at alteeve.ca>

On 05/15/2013 12:22 PM, Dave Johansen wrote:
> I'm setting up a computer with CentOS 6.4 and a mirrored software
> RAID. I would like it to be encrypted so I was wondering what the best
> configuration is. The only info I could find is
> http://lists.centos.org/pipermail/centos-docs/2008-October/001912.html
> but it appears to be a bit old and the info on the wiki (
> http://wiki.centos.org/HowTos/EncryptTmpSwapHome ) doesn't seem to
> address RAIDs.
> My main question is will it be better to encrypt the RAID itself or
> the two partitions used by the RAID? Any other things I should be
> aware of?
> Thanks,
> Dave

This depends on your use-case. Personally, I want my servers to be able 
to boot headless, so I leave /boot, <swap> and / unencrypted, RAID or 
not. Then I encrypt the LV (or partition) I am going to put data I care 
about on. I don't think there is any benefit to encrypting the 
partitions behind the MD device as it won't be able to form until you 
decrypt the devices. I'd keep crypt on the resulting /dev/mdX, at the 

Again, it depends on your use-case.

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