[CentOS-virt] Now on to creation of disk images

Mon Jul 18 20:03:56 UTC 2011
Steve Campbell <campbell at cnpapers.com>

On 7/18/2011 10:17 AM, Kelvin Edmison wrote:
> On 11-07-18 8:26 AM, "Steve Campbell"<campbell at cnpapers.com>  wrote:
>> On 6/28/2011 10:50 AM, Ed Heron wrote:
>>> On Tue, 2011-06-28 at 09:30 -0400, Steve Campbell wrote:
>>>> Mr. Heron was so kind to make a suggestion that I should use disk images
>>>> to install VMs. Upon further thought, I kinda like the idea. So I
>>>> re-read the manual and google a little, and discover I still don't know
>>>> what should be in these disk images.
>>>> Should I copy the contents of the CDs to a file or what? I've got a test
>>>> server at the moment with Centos 5.5 and xen installed as the host OS,
>>>> but have just downloaded the 5.6 CD ISOs along with the  DVD ISO, so
>>>> I'll use 5.6 for my VMs. I've read about how I can create an image from
>>>> something that already exists.
>>>> Again, any clarity would be appreciated.
>>>     Just put the ISO's in /var/lib/xen/images and point at them.  If you
>>> didn't download the discs, you can rip them using:
>>> dd if=/dev/<optical device>   of=/var/lib/xen/images/<name of disc>
>>>     For example, if ripping the first 5.6 CD...
>>> dd if=/dev/hdc of=/var/lib/xen/images/CentOS-5.6-i386-d1.iso
>>> I generally rip a disc multiple times and then do a file compare to make
>>> sure I've got a reasonable chance of having an undamaged copy.
>>>     Keep in mind that it isn't as easy to change discs when you are using
>>> images on a paravirtual machine.
>>>     I still recommend setting up a local repository as a much better
>>> solution because it allows you to take a snapshot so multiple installs
>>> use the exact same versions of everything.
>> I moved the iso images to a folder under /var/lib/xen/images and
>> selected it during an install for a new VM. I've run into a problem I've
>> not yet seen before. The first iso is used just fine, but the second is
>> "Not accessible", and nothing I can discover works.
>> So, should the ISOs be moved directly to the images folder instead of a
>> folder below images? Does it matter whether I just copy the iso files
>> (actually, I used scp) or do they need to  be run through dd?
> If you have SELinux enabled then it could be denying access to images in a
> 'non-standard' folder.  Try putting them directly in the images folder, or
> alternatively, if you don't care about SELinux, setting SELinux to
> Permissive or Disabled.
> Cheers,
>    Kelvin

Still no luck.

I have all the iso images (8 of them named just as they are named on the 
mirrors) copied to /var/lib/xen/images.

When creating a new VM, I'm asked where my ISO images are. It only lets 
me select a file, not a folder, so when it's time to go to the next iso 
image, it asks me to insert the second disk, and then complains that it 
can't access the CD.

What am I missing? I upgraded everything to the latest, so it's all current.

Thanks for all the help so far.