[CentOS-virt] How to clone a guest for cold stand by

Wed Apr 16 14:21:23 UTC 2008
Götz Reinicke <goetz.reinicke at filmakademie.de>

Ross S. W. Walker schrieb:
> Manuel Wolfshant wrote:
>> Götz Reinicke wrote:
>>> Hi,
>>> what would be the shortest and fastest way to clone a e.g. basic 
>>> Centos 5 guest for further use? For example I'd like to set up a 
>>> master Mysql-server as a guest an than "clone" two additional slaves.
>> I have a lvm "template", i.e. a simple volume with the OS 
>> skeleton ( a 
>> minimal install). When I need a new VM I do
>> - lvcreate newvolume
>> - mkfs newvolume
>> - mount template /mnt/source
>> - mount newvolume /mnt/destination
>> - cp -a /mnt/source /mnt/destination
>> wash, rinse, repeat as needed.
>>> Which xen configfiles may be edited?
>> cp /etc/xen/template /etc/xen/newVM
>> vim /etc/xen/newVM
>>> Can the config and the filesystem simply be copied?
>> yes.
> There is another approach too. You can set up your guests
> as virtual diskless servers which can net boot their
> configuration from dom0. Maybe iSCSI or blktap their
> root drives and overlay a configuration over / or /etc
> from NFS on dom0, or their whole configuration.
> You can definitely mash-up some good ideas with LTSP
> and Xen.
> I wish Xen had a virtual 10Gbe interface, then you can
> really do some nifty stuff!
> I personnally setup KDM or GDM in each domU to do XDMCP
> broadcast then I can pick which virtual guest to log into
> once it is up and running and with KDM/GDM user switching
> I open another session, pick a guest and get a full
> graphical login.

That sounds realy cool; do you have any wiki or how to set this things 
up. (I know that there are a lot of how tos, but they seem to handle 
mostly special aspects ... )


Götz Reinicke
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