Re: [Xen-users] Installing two versions of xen on the same machine

[shankha <shankhabanerjee@xxxxxxxxx>]

Hi,
Should i need to build the initrd image  or i can use the old one(the
one which was build when i installed a previous version of xen
hypervisor). I am am using the old kernel.

thanks
shankha

On Tue, Sep 8, 2009 at 6:04 AM, shankha<shankhabanerjee@xxxxxxxxx> wrote:
> Hi,
> One more query. When i had build the source code of the xen
> hypervisor (make world) it had build the linux kernel also(downloaded
> the bits using mercurial).
>
> Would it be possible to just build the hypervisor ?
>
> Isn't the hypervisor and linux kernel linked ? Pardon my ignorance.
>
> Like is the linux kernel  which is used is specially build to work
> with the hyper visor or i can i can build any version of the kernel
> and it should work with the hypervisor.
>
> thanks
>
> On Tue, Sep 8, 2009 at 5:46 AM, shankha<shankhabanerjee@xxxxxxxxx> wrote:
>> Hi Fajar,
>> Thanks for your continued help. I checked through yast the following
>> are installed on my system
>>
>> 1. Kernel-Xen
>>             The linux kernel for xen paravirtualization.
>> This kernel can be used both as the domain0 ("xen0") and as an
>> unprivileged ("xenU") kernel.
>>
>> Version : 2.6.27.7-9.1  (x86_64)
>>
>> 2. kernel-xen-base
>> The Linux kernel for Xen paravirtualization.
>> This kernel can be used both as the domain0 ("xen0") and as an
>> unprivileged ("xenU") kernel.
>>
>> 2.6.27.7-9.1  (x86_64)
>>
>> 3. kernel-xen-extra
>> The Linux kernel for Xen paravirtualization.
>> This kernel can be used both as the domain0 ("xen0") and as an
>> unprivileged ("xenU") kernel.
>>
>>
>> 2.6.27.7-9.1  (x86_64)
>>
>> 4. xen
>> This is the xen hypervisor
>>
>> 3.3.1_18494_03-1.8  (x86_64)
>>
>> 4. xen-devel
>> 3.3.1_18494_03-1.8  (x86_64)
>>
>> This package contains libraries and header files.
>>
>> When i try to to uninstall this package it says it has a dependency on 
>> libvrt.
>>
>> 5.xen - libs
>> xen virtualization libraries
>>
>> 6. xen - tools
>> Packages for starting stopping packages.
>>
>>
>> I guess i can let the  first 3 packages as it is. I will
>> uninstall the xen hypervisor and other packages related to it.
>>
>> I can then put the the new hypervisor(3.4)  and related libraries
>> under /boot and boot with the kernel already installed.
>>
>> Does it look good or have i made mistakes ?
>>
>> thanks
>>
>>
>> On Mon, Sep 7, 2009 at 11:21 PM, Fajar A. Nugraha<fajar@xxxxxxxxx> wrote:
>>> On Tue, Sep 8, 2009 at 4:53 AM, shankha<shankhabanerjee@xxxxxxxxx> wrote:
>>>> Hi,
>>>> I am trying to use a new version of the hypervisor. I am not trying to
>>>> install a new version of the  kernel.
>>>
>>> In that case you don't need to install kernel 2.6.18-8 if you don't
>>> want to. You can use your existing kernel.
>>> However installing hypervisor and userland tools will overwrite some
>>> files installed by your OS if your OS already has its own Xen version.
>>>
>>> --
>>> Fajar
>>>
>>>>
>>>> thanks
>>>>
>>>> On Mon, Sep 7, 2009 at 5:37 PM, Fajar A. Nugraha<fajar@xxxxxxxxx> wrote:
>>>>> On Tue, Sep 8, 2009 at 3:57 AM, shankha<shankhabanerjee@xxxxxxxxx> wrote:
>>>>>> Hi,
>>>>>> Thanks for your reply. Could you please let me know what is the
>>>>>> problem with my mkinitrd command. Is it because i may have forgot to
>>>>>> copy some part of the installation.
>>>>>
>>>>> Installing a new KERNEL (including xen kernel) should be "safe" (as in
>>>>> it shouldn't overwrite anything you already have) assuming it's
>>>>> version is different from what you have. It's easier to simply run
>>>>> "make modules_install" and "make install" on kernel build directory.
>>>>>
>>>>> Installxing Xen however, is more then just the kernel. It also
>>>>> installs hypervisor userland tools (e.g. xm, xend, etc.), which most
>>>>> likely will overwrite what you already have. Which is why I said you
>>>>> can only have one version of Xen.
>>>>>
>>>>> What are you trying to do here? Use a new kernel or use a new Xen
>>>>> version? Those two does not necessarily be done at the same time. If
>>>>> you only want a new Xen version, usually you can just use kernel-xen
>>>>> provided by your distro and simply install the hypervisor (xen.gz) and
>>>>> userland tools.
>>>>>
>>>>> Here's a hint : trying out different versions of Xen is actually
>>>>> easiest on RHEL5, thanks to Gitco's repository
>>>>> http://www.gitco.de/repo/.
>>>>>
>>>>>> IF yes can we make a wild guess.
>>>>>> Also what are the correct options that should be used while creating
>>>>>> the image.
>>>>>
>>>>> man mkinitrd? I'm not familiar enough with Suse, but as I recall its
>>>>> option is slightly different from Redhat's.
>>>>>
>>>>> --
>>>>> Fajar
>>>>>
>>>>
>>>
>>
>

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