[Fedora-xen] How to change hostname from cloned VMs

Daniel Veillard veillard at redhat.com
Fri Jun 20 07:51:39 UTC 2008


On Thu, Jun 19, 2008 at 06:56:22PM -0300, Marcel Damásio wrote:
> Hi all!
> 
> I have a question not specifically about virtualization.
> I'm using virt-clone to clone my VMs.
> But the new VMs generated have the same hostname as the original.
> 
> How can I change my VMs hostname without impact any application?
> There are a lot of places that I can change the hostname, but I don't know
> the right and garanteed way to do that change.

  I don't think there is a 'right and garanteed way to do that change'.
many things may embed the host name, like application configuration files,
certificates, etc.
  Some things can be automated, like grepping for the hostname in /etc/
subtree, changing /etc/sysconfig/network is one safe thing to do automatically
but you really can't guarantee to provide a recipe which will work in all cases
for all software, since each can use its own way.
  Based on your set and your environment I think there is always some 
specifics which need to be aplied after cloning, like forcing regeneration
of machine certificates, ssh keys, the applications configuration and
plugging the new clone in your infrastructure (DNS/DHCP/...) it's always
a bit more than just the hostname from my viewpoint, and very hard to
generalize because it quickly get very specific.

Daniel

-- 
Red Hat Virtualization group http://redhat.com/virtualization/
Daniel Veillard      | virtualization library  http://libvirt.org/
veillard at redhat.com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
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