Xen users - Apr 2007 - new installation of the base operating system

Hi @all,

i have installed Fedore Core 6 with Xen-Support.
now i have to install  fedora core 7 or centos5 as the
new base operting system.

will there be any problems after the new installation to start my
configuerd virtual machines? i have the "disks" of the virtual
machines
on a seperate LVM partition. i would change /dev/sda1, /dev/sda2 and
/dev/sda3 (new installation)
but not the filesystems where the virtual machines are stored (/dev/sda5).
has anyone experience with that or can tell me if i will get in trouble to
start the VMs after the the base
operating system?

my partion table at the moment:

/dev/sda1   *           1          19      152586   83  Linux
/dev/sda2              20        3843    30716280   83  Linux
/dev/sda3            3844        4990     9213277+  82  Linux swap / Solaris

/dev/sda4               Extended
/dev/sda5               Linux LVM

thank you very much for help!
greets,
Abri

Hi @all,

i have to install  fedora core 7 or centos5 as a
new base operating system.

will there be any problems after the new installation to start my
configuered virtual machines? i have the "disks" of the virtual
machines on
a seperate LVM partition. i would change /dev/sda1, /dev/sda2 and /dev/sda3
(new installation)
but not the filesystems where the virtual machines are stored (/dev/sda5).
has anyone experience with that or can tell me if i will get in trouble to
start the VMs after the base operating system?

my partion table at the moment:

/dev/sda1   *           1          19      152586   83  Linux
/dev/sda2              20        3843    30716280   83  Linux
/dev/sda3            3844        4990     9213277+  82  Linux swap

/dev/sda4               Extended
/dev/sda5               Linux LVM

thank you very much for help!
greets,
Abri


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Abri Nation wrote:
>
> Hi @all,
>
> i have to install  fedora core 7 or centos5 as a
> new base operating system.
>
> will there be any problems after the new installation to start my
> configuered virtual machines? i have the "disks" of the virtual 
> machines on a seperate LVM partition. i would change /dev/sda1, 
> /dev/sda2 and /dev/sda3 (new installation)
> but not the filesystems where the virtual machines are stored 
> (/dev/sda5).
> has anyone experience with that or can tell me if i will get in 
> trouble to start the VMs after the base operating system?
>
> my partion table at the moment:
>
> /dev/sda1   *           1          19      152586   83  Linux
> /dev/sda2              20        3843    30716280   83  Linux
> /dev/sda3            3844        4990     9213277+  82  Linux swap
>
> /dev/sda4               Extended
> /dev/sda5               Linux LVM
>
> thank you very much for help!
> greets,
> Abri
Are your images fully virtualized or paravirtualized? You may have to 
play some kernel duplication games with paravirtualized.

Can you just do an OS update to CentOS 5 or FC 7, rather than having to 
install from scratch? And can you back up your images somewhere for 
safety''s sake before you update?

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2007/4/14, Nico Kadel-Garcia <nkadel@gmail.com>:
>
> Abri Nation wrote:
> >
> > Hi @all,
> >
> > i have to install  fedora core 7 or centos5 as a
> > new base operating system.
> >
> > will there be any problems after the new installation to start my
> > configuered virtual machines? i have the "disks" of the
virtual
> > machines on a seperate LVM partition. i would change /dev/sda1,
> > /dev/sda2 and /dev/sda3 (new installation)
> > but not the filesystems where the virtual machines are stored
> > (/dev/sda5).
> > has anyone experience with that or can tell me if i will get in
> > trouble to start the VMs after the base operating system?
> >
> > my partion table at the moment:
> >
> > /dev/sda1   *           1          19      152586   83  Linux
> > /dev/sda2              20        3843    30716280   83  Linux
> > /dev/sda3            3844        4990     9213277+  82  Linux swap
> >
> > /dev/sda4               Extended
> > /dev/sda5               Linux LVM
> >
> > thank you very much for help!
> > greets,
> > Abri
> Are your images fully virtualized or paravirtualized? You may have to
> play some kernel duplication games with paravirtualized.
>
> Can you just do an OS update to CentOS 5 or FC 7, rather than having to
> install from scratch? And can you back up your images somewhere for
> safety''s sake before you update?
>
Thank you for your answer!

The images are fully virtualized.
An update is not possible, cause now i use FC6 i386, and i have to install
"centos5 with 64 Bit support" (could this change from i386 to 64Bit
support
be also a problem for the images to start?)... i made already a backup of
/etc/xen/* and for the images. do i need to attend something else?

Thank you!
greets,
Abri


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Abri Nation wrote:
>
>
>
> Thank you for your answer!
>
> The images are fully virtualized.
> An update is not possible, cause now i use FC6 i386, and i have to 
> install "centos5 with 64 Bit support" (could this change from
i386 to
> 64Bit support be also a problem for the images to start?)... i made 
> already a backup of /etc/xen/* and for the images. do i need to attend 
> something else?
Switching from 32-bit to 64-bit "en vivo" this way is begging for
pain.
Backing up your images and Xen setup is *good*. I''ve seen reports of 
people running 32-bit VM''s successfully on 64-bit OS''s, but
I''ve
personally had serious trouble with running non-rebuilt apps from 32-bit 
environments in a 64-bit environment. (Wacom devices, in particular.)

Why do you have to update your server to 64-bit but not your VM''s?

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2007/4/15, Nico Kadel-Garcia <nkadel@gmail.com>:
>
> Abri Nation wrote:
> >
> >
> >
> > Thank you for your answer!
> >
> > The images are fully virtualized.
> > An update is not possible, cause now i use FC6 i386, and i have to
> > install "centos5 with 64 Bit support" (could this change
from i386 to
> > 64Bit support be also a problem for the images to start?)... i made
> > already a backup of /etc/xen/* and for the images. do i need to attend
> > something else?
> Switching from 32-bit to 64-bit "en vivo" this way is begging for
pain.
> Backing up your images and Xen setup is *good*. I''ve seen reports
of
> people running 32-bit VM''s successfully on 64-bit OS''s,
but I''ve
> personally had serious trouble with running non-rebuilt apps from 32-bit
> environments in a 64-bit environment. (Wacom devices, in particular.)
>
> Why do you have to update your server to 64-bit but not your VM''s?

64-bit was the request of the boss for the base operating
system, but i could install i386 also.
the
instantaneous installation was actually not for active service. but
now the virtual machines
are running, and i have to switch the operating system cause we do no
use fedora on our linux servers at all.

also you do not recommend to install 64-bit? than i will install i386, i
think there would not be such a big difference,or?

thank you Nico!


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Abri Nation wrote:
>
>
> 2007/4/15, Nico Kadel-Garcia <nkadel@gmail.com 
> <mailto:nkadel@gmail.com>>:
>
>     Abri Nation wrote:
>     >
>     >
>     >
>     > Thank you for your answer!
>     >
>     > The images are fully virtualized.
>     > An update is not possible, cause now i use FC6 i386, and i have to
>     > install "centos5 with 64 Bit support" (could this change
from
>     i386 to
>     > 64Bit support be also a problem for the images to start?)... i
made
>     > already a backup of /etc/xen/* and for the images. do i need to
>     attend
>     > something else?
>     Switching from 32-bit to 64-bit "en vivo" this way is begging
for
>     pain.
>     Backing up your images and Xen setup is *good*. I''ve seen
reports of
>     people running 32-bit VM''s successfully on 64-bit
OS''s, but I''ve
>     personally had serious trouble with running non-rebuilt apps from
>     32-bit
>     environments in a 64-bit environment. (Wacom devices, in particular.)
>
>     Why do you have to update your server to 64-bit but not your
VM''s?
>
>
> 64-bit was the request of the boss for the base operating 
> system, but i could install i386 also. 
> the  
> instantaneous installation was actually not for active service. but now the
virtual machines
> are running, and i have to switch the operating system cause we do no use
fedora on our linux servers at all.
>
> also you do not recommend to install 64-bit? than i will install i386, 
> i think there would not be such a big difference,or?
>
> thank you Nico!
>  
I haven''t tried running 32-bit DomU''s under 64-bit operating
sytems. I
may get a chance to in 2 weeks, but it just seems to be begging for trouble.

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You can run a 32-bit userland on a 64-bit kernel. That''s what i do.

/Jonathan

Nico Kadel-Garcia skrev:
> Abri Nation wrote:
>>
>>
>> 2007/4/15, Nico Kadel-Garcia <nkadel@gmail.com 
>> <mailto:nkadel@gmail.com>>:
>>
>>     Abri Nation wrote:
>>     >
>>     >
>>     >
>>     > Thank you for your answer!
>>     >
>>     > The images are fully virtualized.
>>     > An update is not possible, cause now i use FC6 i386, and i
have to
>>     > install "centos5 with 64 Bit support" (could this
change from
>>     i386 to
>>     > 64Bit support be also a problem for the images to start?)... i
>> made
>>     > already a backup of /etc/xen/* and for the images. do i need
to
>>     attend
>>     > something else?
>>     Switching from 32-bit to 64-bit "en vivo" this way is
begging for
>>     pain.
>>     Backing up your images and Xen setup is *good*. I''ve seen
reports of
>>     people running 32-bit VM''s successfully on 64-bit
OS''s, but I''ve
>>     personally had serious trouble with running non-rebuilt apps from
>>     32-bit
>>     environments in a 64-bit environment. (Wacom devices, in 
>> particular.)
>>
>>     Why do you have to update your server to 64-bit but not your
VM''s?
>>
>>
>> 64-bit was the request of the boss for the base operating system, but 
>> i could install i386 also. the  instantaneous installation was 
>> actually not for active service. but now the virtual machines are 
>> running, and i have to switch the operating system cause we do no use 
>> fedora on our linux servers at all.
>> also you do not recommend to install 64-bit? than i will install 
>> i386, i think there would not be such a big difference,or?
>>
>> thank you Nico!
>>  
> I haven''t tried running 32-bit DomU''s under 64-bit
operating sytems. I
> may get a chance to in 2 weeks, but it just seems to be begging for 
> trouble.
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

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Jonathan Selander wrote:
> You can run a 32-bit userland on a 64-bit kernel. That''s what i
do.
A 32-bit DomU? Or a 32-bit chrooted environment?

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If your guests are all 32-bit HVMs there should be no problem going from 32-bit
to 64-bit. There would be a problem if you had 64-bit HVMs and wanted to go from
64-bit to 32...
 
If you have 32-bit DomUs you will need to make sure you have a version of Xen
that has the 32bit-on-64bit patches, I believe OpenSUSE has a version of 3.0.4
with these, or you will have to run Xen unstable or wait for 3.0.5.
 
-Ross
 


________________________________

	From: xen-users-bounces@lists.xensource.com
[mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Abri Nation
	Sent: Sunday, April 15, 2007 6:27 AM
	To: Nico Kadel-Garcia
	Cc: xen-users@lists.xensource.com
	Subject: Re: [Xen-users] new installation of the base operating system
	
	


	2007/4/15, Nico Kadel-Garcia <nkadel@gmail.com>: 

		Abri Nation wrote:
		>
		>
		>
		> Thank you for your answer!
		>
		> The images are fully virtualized.
		> An update is not possible, cause now i use FC6 i386, and i have to
		> install "centos5 with 64 Bit support" (could this change from
i386 to
		> 64Bit support be also a problem for the images to start?)... i made
		> already a backup of /etc/xen/* and for the images. do i need to attend
		> something else?
		Switching from 32-bit to 64-bit "en vivo" this way is begging for
pain.
		Backing up your images and Xen setup is *good*. I''ve seen reports of
		people running 32-bit VM''s successfully on 64-bit OS''s, but
I''ve
		personally had serious trouble with running non-rebuilt apps from 32-bit 
		environments in a 64-bit environment. (Wacom devices, in particular.)
		
		Why do you have to update your server to 64-bit but not your VM''s?


	64-bit was the request of the boss for the base operating system, but i could
install i386 also.
	the  instantaneous installation was actually not for active service. but now
the virtual machines
	are running, and i have to switch the operating system cause we do no use
fedora on our linux servers at all.
	
	also you do not recommend to install 64-bit? than i will install i386, i think
there would not be such a big difference,or?
	
	thank you Nico!
	 




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On Sun, Apr 15, 2007 at 12:58:30PM +0100, Nico Kadel-Garcia
wrote:
> Jonathan Selander wrote:
> >You can run a 32-bit userland on a 64-bit kernel. That''s what
i do.
> A 32-bit DomU? Or a 32-bit chrooted environment?
He means just as he said: a domU with a 64-bit kernel but with
everything else 32-bit.

Cheers,
Andy


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