Xen users - Mar 2008 - Re: Xen: invalid source and/or image destination

I''ve not gone completly mad... but I''m getting there.....

I have been trying to get a VM under a XEN-CentOS5.1 installation and its
not having any of it!

I first looked for help in the 
http://www.centos.org/modules/newbb/viewtopic.php?topic_id=12946 CentOS
forums  but have currently had no reply.  
(sorry for linking to the details outside of this forum)

Basically - I have a fully patched, clean install (XEN up and running) and
have been following a few web based forums, blogs and user guides; all with
out luck..

Any advise or guidance would be very much appreciated.

Thanks in advance... 
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You should explain what you did so far and where you are stuck right 
now. Only then we would be able to help you.

How r u creating guest OS? Using virt-manager or virt-install?

--Sadique


new2xen wrote:
> I''ve not gone completly mad... but I''m getting there.....
>
> I have been trying to get a VM under a XEN-CentOS5.1 installation and its
> not having any of it!
>
> I first looked for help in the 
> http://www.centos.org/modules/newbb/viewtopic.php?topic_id=12946 CentOS
> forums  but have currently had no reply.  
> (sorry for linking to the details outside of this forum)
>
> Basically - I have a fully patched, clean install (XEN up and running) and
> have been following a few web based forums, blogs and user guides; all with
> out luck..
>
> Any advise or guidance would be very much appreciated.
>
> Thanks in advance... 
>   

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Sadique,

A fully history is here: (let me know if you''d prefer me to repost it)
http://www.centos.org/modules/newbb/viewtopic.php?topic_id=12946

I''m starting from a fresh patched CentOs 5.1 with XEN configured as
part of
the installer.

I have tried using both the VM Manager and XM create - neither of which seem
to work; I guess that I''m missing a basic 

Let me know if you need more info (and thanks).

Colin


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On Sun, 2 Mar 2008 12:24:31 -0800 (PST)
new2xen <colinking@lineone.net> wrote:
> I have tried using both the VM Manager and XM create - neither of which
seem
> to work; I guess that I''m missing a basic 
I was just experimenting with centos on centos paravirt images and
kept getting the same invalid install source messages.

I was trying to install from a loopback mounted centos DVD iso image,
and I finally noticed errors about loop problems mounting on some
silly path virt-manager was trying to use internally. I figured it
must be trying to loopback mount the thing I''ve already loopback
mounted and that was giving it indigestion.

I started apache, mounted the DVD image under /var/www/html, then
pointed virt-manager at the http://localhost/centos/ tree, and that
made it happy - it was able to install via http.

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Was it really that simple....

Its taken me weeks to do just write:

cd /var/www/html
ln -s /media/CentOS_5.1_Final
virt-manager

Now what was I trying to do again.........  Thanks you very much.

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Although starting off well - I''m now hitting

"Unable to retrieve http://127.0.0.1/CentOS_5.1_Final/images/stage2.img
"

Reading up a little I have found the using 127.0.0.1 is a bit of a no-no; so
have changed to use the actual IP address; but the problem is the same.

Also read that "ln -s" isn''t great either so I have not tried
to mount via:

mount -t iso9660 -o ro /dev/cdrom /var/www/html/CentOS

Which seems to work (the mounting part) same problem though.

Now - when I first did this I hit: "Unable to retreive
http:/127.0.0.1/images/minstg2.img" but this just went away after a few
attempts and moved onto "stage2.img"...

I have not tried to copy the whole DVD under /var/www/html - perhaps I
should!

any ideas?

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new2xen wrote:
> Although starting off well - I''m now hitting
> 
> "Unable to retrieve
http://127.0.0.1/CentOS_5.1_Final/images/stage2.img "
> 
> Reading up a little I have found the using 127.0.0.1 is a bit of a no-no;
so
> have changed to use the actual IP address; but the problem is the same.
> 
> Also read that "ln -s" isn''t great either so I have not
tried to mount via:
> 
> mount -t iso9660 -o ro /dev/cdrom /var/www/html/CentOS
> 
> Which seems to work (the mounting part) same problem though.
> 
> Now - when I first did this I hit: "Unable to retreive
> http:/127.0.0.1/images/minstg2.img" but this just went away after a
few
> attempts and moved onto "stage2.img"...
> 
> I have not tried to copy the whole DVD under /var/www/html - perhaps I
> should!
No, don''t do that. Look at:

http://download.fedora.redhat.com/pub/fedora/linux/core/6/x86_64/os/

That''s the top level of an Anaconda install tree.

Can you point your web browser at anything on your *local* network that 
looks like that? If you can, then give that URL to 
virt-install/manager/whatever. If you can''t:

1) mount your DVD in it''s normal location, as given by /etc/fstab;
let''s
say it''s ''/media/dvd''. when you
''ls'' it, it should look like the URL above.

2) Find the directory Apache serves files from, go to it. Create a 
symlink in this directory to ''/media/dvd'':

 > ln -s /media/dvd MYDVD

When you ''ls'' MYDVD, it should look like the URL above.

3) Browse to ''http://127.0.0.l/MYDVD''. This should look like
the URL above.

4) Start virt-install, supply ''http://127.0.0.1/MYDVD''.
I''ve only done
this between two machines, rather than using 127.0.0.1, but I''d be 
surprised if 127.0.0.1 doesn''t work.

You need to paste the error messages you get, and the commands you try, 
*exactly*. Your commands and error messages don''t make sense.

Evan

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Thanks for the input..... I''ll try to provide better descriptions in
the
future.

The installation tree looks very similar to that of the DVD root.....

When I: "ln -s /media/CentOS_5.1_Final /var/www/html/dvd" I can see it
at
"http://127.0.0.1/dvd".

So running virt-manager:

System Name: CentOS
Method: Paravirtualized
Media: http://127.0.0.1/dvd
Simple File: /var/lib/xen/images/CentOS.img (4000mb)
Network: Shared Physical Device (xenbro)
Allocations: min: 512, max: 1024 vcpu: 1  (actual total: 4096, 4 - domU is
using 2048, 2)

Creates Storage: OK
Creates Domain: OK
Starts VM Console: OK

Language: English
Keyboard: UK
Network: defaults (dynamic IPv4/6 - I have DHCP running on Router)

Error: "Unable to retreive http://127.0.0.1//dvd/images/stage2.img"
or even
Error: "Unable to retreive
http://192.168.0.123//dvd/images/stage2.img"

There is a similar message from the fedora6 OS supplied
"Unable to retrieve
http://download.fedora.redhat.com/pub/fedora/linux/core/6/x86_64/os//images/stage2.img"

Is there a difference between the DVD and an installation tree, and what am
I missing??

(Thanks for you time....)



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Evan Lavelle wrote:
> new2xen wrote:
>> Although starting off well - I''m now hitting
>>
>> "Unable to retrieve 
>> http://127.0.0.1/CentOS_5.1_Final/images/stage2.img "
>>
>> Reading up a little I have found the using 127.0.0.1 is a bit of a 
>> no-no; so
>> have changed to use the actual IP address; but the problem is the same.
>>
>> Also read that "ln -s" isn''t great either so I have
not tried to
>> mount via:
>>
>> mount -t iso9660 -o ro /dev/cdrom /var/www/html/CentOS
>>
>> Which seems to work (the mounting part) same problem though.
>>
>> Now - when I first did this I hit: "Unable to retreive
>> http:/127.0.0.1/images/minstg2.img" but this just went away after
a few
>> attempts and moved onto "stage2.img"...
>>
>> I have not tried to copy the whole DVD under /var/www/html - perhaps I
>> should!
>
> No, don''t do that. Look at:
>
> http://download.fedora.redhat.com/pub/fedora/linux/core/6/x86_64/os/
>
> That''s the top level of an Anaconda install tree.
>
> Can you point your web browser at anything on your *local* network 
> that looks like that? If you can, then give that URL to 
> virt-install/manager/whatever. If you can''t:
>
> 1) mount your DVD in it''s normal location, as given by /etc/fstab;
> let''s say it''s ''/media/dvd''. when you
''ls'' it, it should look like the
> URL above.
>
> 2) Find the directory Apache serves files from, go to it. Create a 
> symlink in this directory to ''/media/dvd'':
>
> > ln -s /media/dvd MYDVD
>
> When you ''ls'' MYDVD, it should look like the URL above.
>
> 3) Browse to ''http://127.0.0.l/MYDVD''. This should look
like the URL
> above.
>
> 4) Start virt-install, supply ''http://127.0.0.1/MYDVD''. 
You should never give 127.0.0.1 to the virt-install/virt-manager. It 
would start up the installation, but wouldn''t continue further. The 
problem is that after the installation is started up, anaconda in the 
guests looks for the distribution at 127.0.0.1 which is local to the 
guest and there won''t be an installation tree available there. You 
should always give the ip address of dom0 instead of 127.0.0.1.

--Sadique
> I''ve only done this between two machines, rather than using
127.0.0.1,
> but I''d be surprised if 127.0.0.1 doesn''t work.
>
> You need to paste the error messages you get, and the commands you 
> try, *exactly*. Your commands and error messages don''t make sense.
>
> Evan
>
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>

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new2xen wrote:
> Thanks for the input..... I''ll try to provide better descriptions
in the
> future.
>
> The installation tree looks very similar to that of the DVD root.....
>
> When I: "ln -s /media/CentOS_5.1_Final /var/www/html/dvd" I can
see it at
> "http://127.0.0.1/dvd".
>
> So running virt-manager:
>
> System Name: CentOS
> Method: Paravirtualized
> Media: http://127.0.0.1/dvd
> Simple File: /var/lib/xen/images/CentOS.img (4000mb)
> Network: Shared Physical Device (xenbro)
> Allocations: min: 512, max: 1024 vcpu: 1  (actual total: 4096, 4 - domU is
> using 2048, 2)
>
> Creates Storage: OK
> Creates Domain: OK
> Starts VM Console: OK
>
> Language: English
> Keyboard: UK
> Network: defaults (dynamic IPv4/6 - I have DHCP running on Router)
>
> Error: "Unable to retreive
http://127.0.0.1//dvd/images/stage2.img"
> or even
> Error: "Unable to retreive
http://192.168.0.123//dvd/images/stage2.img"
>   
As for your problem, it looks like a networking issue in the guest and 
it''s not able to communicate with dom0''s ip. How did you
configure the
networking in the guest? Via DHCP or statically?

--Sadique
> There is a similar message from the fedora6 OS supplied
> "Unable to retrieve
>
http://download.fedora.redhat.com/pub/fedora/linux/core/6/x86_64/os//images/stage2.img"
>
> Is there a difference between the DVD and an installation tree, and what am
> I missing??
>
> (Thanks for you time....)
>
>
>
>   

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Not using 127.0.0.1 makes complete sense.... 

I have got it working; would you believe I had used up all the free DHCP IP
address trying to get it work??!!!!!

I did hit a major issue that may need some investigation: I have recently
received and installed a few new patches (via the auto updater) which once
applied has the affect to removing the "Shared Physical Device -
xenbr0"
from the VM Manager options... very odd.

I have rebuild and have XEN working with a single CentOS 5.1 guest - I now
have the 35 updates to apply.... I''ll post again if I get the same
issue....

In the event all being well - Thank you all very much for your time.

Colin.
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I have the same problem with centos 5.1...that is not having the xenbr0
option when using virt-manager.  I originally installed a windows OS and it
did give me the option, obviously with a fully virtualized system.  However,
after updating the host system a couple days ago, the xenbr0 option is
gone.  The only option I have is using a virtual network that assigns virbr0
and that doesn''t work.  Any one else seeing this and have a solution?
Thank you.

On Wed, Mar 5, 2008 at 4:22 PM, new2xen <colinking@lineone.net> wrote:
>
> Not using 127.0.0.1 makes complete sense....
>
> I have got it working; would you believe I had used up all the free DHCP
> IP
> address trying to get it work??!!!!!
>
> I did hit a major issue that may need some investigation: I have recently
> received and installed a few new patches (via the auto updater) which once
> applied has the affect to removing the "Shared Physical Device -
xenbr0"
> from the VM Manager options... very odd.
>
> I have rebuild and have XEN working with a single CentOS 5.1 guest - I now
> have the 35 updates to apply.... I''ll post again if I get the same
> issue....
>
> In the event all being well - Thank you all very much for your time.
>
> Colin.
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>
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