[CentOS] [Marketing Mail] Create CentOS 6 system as "clone" of another - with LVM and different disk sizes

Fri Apr 13 13:32:13 UTC 2018
Lange, Markus <M.Lange at dnb.de>


You can simply boot a live system to create your partition layout and copy it
over the existing system with rsync. Once your system is copied, you will need
to customize all hardware-dependent configuration files such as {crypt,fs}tab,
network configurations, bootloader and so on depending on your setup.

Don't forget to install the bootloader afterwards!

You can also install a minimal system and use a live system to copy the files
from the existing server to the new one (e.g. with rsync -a). This way you do
not have to create the partition layout and bootloader manually.

Using clonezilla would only replace the part of copying the files and installing
the bootloader, all other settings still have to be made. Rsync should be much
faster for data transfer.

Best regards,
 - Markus
On Fr, 2018-04-13 at 14:46 +0200, Toralf Lund wrote:
> Hi,
> I just found myself having to set up a new CentOS 6 system with a nearly 
> identical configuration to an existing host, so I thought I would just
>  1. Do a minimal install to set up partitions etc. on the new system.
>  2. Create an image of the existing system using Clonezilla
>     (http://www.clonezilla.org)
>  3. Run a Clonezilla restore on the new system.
> - as I though it would be a lot simpler than replicating the exact 
> package selection, installing the same users, doing the same manual 
> config edits (which are required) etc.
> It turns out that it wasn't quite as easy, though. The problem is that 
> the system use LVM2 volumes for the filesystems, and the new host has a 
> slightly smaller disk than the other, and Clonezilla seems unable to 
> restore to a volume that's smaller than the one that was cloned - even 
> if the actual data fits.
> I guess I could temporarily reduce the LVM volume sizes on the existing 
> units and clone again, but I'd rather not if I can avoid it. Just 
> copying file-by-file could be an option, too, but I somehow feel less 
> comfortable doing that than the above; there is something about the way 
> I could end up with a mixture of my "minimal install" and the "cloned" 
> data, I suppose.
> Does anyone have any other ideas about how I might achieve what I want?
> - Toralf
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