On 5/25/2010 3:08 PM, Stephen Harris wrote:
> On Tue, May 25, 2010 at 02:55:27PM -0500, Matt wrote:
>> Is anyone using 'user mode linux' to create virtual centos servers
>> under a master centos server? Is there a package for this? Is xen or
>> something a better way to go?
>
> I use it all the time. I've written a tonne of my own wrapper scripts
> to help manage the process and they kinda work. I can build and deploy
> a new server in minutes.
>
> You need to be careful of UML, though. The kernel must _not_ allow
> loadable modules, otherwise you have no host security at all. This
> may limit it for general purpose stuff. Performance isn't necessarily
> that good, either.
>
> I actually wrote up some basic investigation a couple of months back
> where I looked at
> 1. RedHat (ahem, sorry, CentOS!) 5.4 64bit Xen
> 2. CentOS 5.4 64bit KVM
> 3. Citrix XenServer 5.5
> 4. VMware ESXi 4.0
> 5. VirtualBox 2.2
> 6. VMware Server (version unknown)
> 7. User Mode Linux (2.6.20.7 based kernel)
>
> The writeup is at
> http://sweh.livejournal.com/362994.html
Good article, but kind of outdated already - and doesn't mention the
free vmware converter tool to move guests from physical machines to
vmware or between esxi/server/portable image types which is one of the
nicer points. If reinstalling the base OS is an option and you have a
windows box to run the client, VMware ESXi is a good choice as the host
even though the free version doesn't give you the nifty cloning features.
--
Les Mikesell
lesmikesell@xxxxxxxxx
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