Xen Not Displayed in Boot Menu

[sorabh hamirwasia]

Hi,
I have installed "Xen" on Fedora16 host using "yum install xen" command and
it has been installed properly. I can see the changes in /etc/grub2.cfg
file too. But when I reboot then the entry for Xen is not listed in the
boot menu. On further analyzing I found that in /etc/grub.conf there is no
entry related to Xen. Do we need to modify grub.conf manually ? If yes then
how to do that. ?

Please help me with this.

[Pasi Kärkkäinen]

On Fri, Jun 08, 2012 at 12:00:44AM -0700, sorabh hamirwasia wrote:
> Hi,
>    I have installed "Xen" on Fedora16 host using "yum install xen" command
>    and it has been installed properly. I can see the changes in
>    /etc/grub2.cfg file too. But when I reboot then the entry for Xen is not
>    listed in the boot menu. On further analyzing I found that in
>    /etc/grub.conf there is no entry related to Xen. Do we need to modify
>    grub.conf manually ? If yes then how to do that. ?
>    Please help me with this.

You can tweak the Xen hypervisor cmdline options in:
/etc/default/grub file, like this:

GRUB_DEFAULT="Xen"
GRUB_CMDLINE_XEN="dom0_mem=1024M,max:1024M loglvl=all guest_loglvl=all"

.. or whatever options you want to use.
After that update the grub menu: grub2-mkconfig -o /boot/grub2/grub.cfg

-- Pasi

[Konrad Rzeszutek Wilk]

On Sat, Jun 09, 2012 at 02:37:32PM +0300, Pasi Kärkkäinen wrote:
> On Fri, Jun 08, 2012 at 12:00:44AM -0700, sorabh hamirwasia wrote:
> > Hi,
> >    I have installed "Xen" on Fedora16 host using "yum install xen" command
> >    and it has been installed properly. I can see the changes in
> >    /etc/grub2.cfg file too. But when I reboot then the entry for Xen is not
> >    listed in the boot menu. On further analyzing I found that in
> >    /etc/grub.conf there is no entry related to Xen. Do we need to modify

Wouldn't it be in /boot/grub2/grub.cfg ?
> > grub.conf manually ? If yes then how to do that. ?
> >    Please help me with this.
>
> You can tweak the Xen hypervisor cmdline options in:
> /etc/default/grub file, like this:
>
> GRUB_DEFAULT="Xen"
> GRUB_CMDLINE_XEN="dom0_mem=1024M,max:1024M loglvl=all guest_loglvl=all"
>
> .. or whatever options you want to use.
> After that update the grub menu: grub2-mkconfig -o /boot/grub2/grub.cfg
>
> -- Pasi
>
> --
> xen mailing list
> [e-mail]
> https://admin.fedoraproject.org/mailman/listinfo/xen

[sorabh hamirwasia]

I found the resolution for it. If we update the bootloader to use grub2
instead of legacy grub it will then list all the options. Linux as well as
Xen related options. For updating the bootloader I followed the steps
mentioned in below link :-

http://fedoraproject.org/wiki/Features/Grub2#From_an_Installed_System_with_G...

Testing With Chain Loading

GRUB2 includes a boot image that's loadable from GRUB Legacy, so you can
try it out without wiping out your existing, working MBR. To set up GRUB2
without actually writing to the MBR, run

grub2-install --grub-setup=/bin/true /dev/sda
Writing to the MBR

If that works, you can go on testing to writing to your MBR. Same steps as
above, but don't tell grub to run the dummy setup program /bin/true

grub2-install /dev/sda

Congratulations! You've reached the point of no return! If you can't boot
now you will need to run a rescue CD

Regards,

~Sorabh

On Mon, Jun 11, 2012 at 11:27 AM, Konrad Rzeszutek Wilk <
[e-mail]> wrote:
> On Sat, Jun 09, 2012 at 02:37:32PM +0300, Pasi Kärkkäinen wrote:
> > On Fri, Jun 08, 2012 at 12:00:44AM -0700, sorabh hamirwasia wrote:
> > > Hi,
> > >    I have installed "Xen" on Fedora16 host using "yum install xen"
>
> command
> > > and it has been installed properly. I can see the changes in
> > >    /etc/grub2.cfg file too. But when I reboot then the entry for Xen
>
> is not
> > > listed in the boot menu. On further analyzing I found that in
> > >    /etc/grub.conf there is no entry related to Xen. Do we need to
>
> modify
>
> Wouldn't it be in /boot/grub2/grub.cfg ?
> > > grub.conf manually ? If yes then how to do that. ?
> > >    Please help me with this.
> >
> > You can tweak the Xen hypervisor cmdline options in:
> > /etc/default/grub file, like this:
> >
> > GRUB_DEFAULT="Xen"
> > GRUB_CMDLINE_XEN="dom0_mem=1024M,max:1024M loglvl=all guest_loglvl=all"
> >
> > .. or whatever options you want to use.
> > After that update the grub menu: grub2-mkconfig -o /boot/grub2/grub.cfg
> >
> > -- Pasi
> >
> > --
> > xen mailing list
> > [e-mail]
> > https://admin.fedoraproject.org/mailman/listinfo/xen

[Jerry Amundson]

On Sat, Jun 9, 2012 at 6:37 AM, Pasi Kärkkäinen  wrote:
> On Fri, Jun 08, 2012 at 12:00:44AM -0700, sorabh hamirwasia wrote:
> > Hi,
> >    I have installed "Xen" on Fedora16 host using "yum install xen" command
> >    and it has been installed properly. I can see the changes in
> >    /etc/grub2.cfg file too. But when I reboot then the entry for Xen is not
> >    listed in the boot menu. On further analyzing I found that in
> >    /etc/grub.conf there is no entry related to Xen. Do we need to modify
> >    grub.conf manually ? If yes then how to do that. ?
> >    Please help me with this.
>
> You can tweak the Xen hypervisor cmdline options in:
> /etc/default/grub file, like this:
>
> GRUB_DEFAULT="Xen"

The only thing I see in fc17 (also) is a
set default="Xen"
line in /boot/grub2/grub.cfg

I've been waiting, hoping, and did a fresh install of Fedora 17, then
"yum install xen", in anticipation (again) of Fedora/Xen/dom0 boot
magic.
Disappointment.

Thanks anyway,
jerry

[Pasi Kärkkäinen]

On Wed, Jun 27, 2012 at 10:40:01PM -0500, Jerry Amundson wrote:
> On Sat, Jun 9, 2012 at 6:37 AM, Pasi Kärkkäinen  wrote:
> > On Fri, Jun 08, 2012 at 12:00:44AM -0700, sorabh hamirwasia wrote:
> > > Hi,
> > >    I have installed "Xen" on Fedora16 host using "yum install xen" command
> > >    and it has been installed properly. I can see the changes in
> > >    /etc/grub2.cfg file too. But when I reboot then the entry for Xen is not
> > >    listed in the boot menu. On further analyzing I found that in
> > >    /etc/grub.conf there is no entry related to Xen. Do we need to modify
> > >    grub.conf manually ? If yes then how to do that. ?
> > >    Please help me with this.
> >
> > You can tweak the Xen hypervisor cmdline options in:
> > /etc/default/grub file, like this:
> >
> > GRUB_DEFAULT="Xen"
>
> The only thing I see in fc17 (also) is a
> set default="Xen"
> line in /boot/grub2/grub.cfg
>
> I've been waiting, hoping, and did a fresh install of Fedora 17, then
> "yum install xen", in anticipation (again) of Fedora/Xen/dom0 boot
> magic.
> Disappointment.

And did you run "grub2-mkconfig -o /boot/grub2/grub.cfg" ?

What's the problem?

-- Pasi

[Dario Faggioli]

On Thu, 2012-06-28 at 17:22 +0300, Pasi Kärkkäinen wrote:
> > I've been waiting, hoping, and did a fresh install of Fedora 17, then
> > "yum install xen", in anticipation (again) of Fedora/Xen/dom0 boot
> > magic.
> > Disappointment.

:-(
> And did you run "grub2-mkconfig -o /boot/grub2/grub.cfg" ?
>
> What's the problem?

Just for the record, this is all working for me, right out of the box,
for both F16 and F17. All I do is `yum install xen' and when rebooting I
found all I need in grub...

Dario

[Konrad Rzeszutek Wilk]

On Fri, Jun 29, 2012 at 02:47:25PM +0200, Dario Faggioli wrote:
> On Thu, 2012-06-28 at 17:22 +0300, Pasi Kärkkäinen wrote:
> > > I've been waiting, hoping, and did a fresh install of Fedora 17, then
> > > "yum install xen", in anticipation (again) of Fedora/Xen/dom0 boot
> > > magic.
> > > Disappointment.
>
> :-(
> > And did you run "grub2-mkconfig -o /boot/grub2/grub.cfg" ?
> >
> > What's the problem?

I wonder if the person built their own kernel? One of the things
/etc/grub.d/20-xenlinux is that it scans in /boot/config-XXX to see
if CONFIG_XEN_DOM0 is defined. Well, if you try to install the kernel
doing:

make oldconfig
 make install

it won't put the config file in /boot directory. So Grub won't create
an Xen entry for it. The fix is to manually copy the config to /boot
and it works just right.

Or just use kernel RPMS.
> >
>
> Just for the record, this is all working for me, right out of the box,
> for both F16 and F17. All I do is `yum install xen' and when rebooting I
> found all I need in grub...
>
> Dario
>
> --
> <<This happens because I choose it to happen!>> (Raistlin Majere)
>
> Dario Faggioli, Ph.D, http://retis.sssup.it/people/faggioli
> Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
> --
> xen mailing list
> [e-mail]
> https://admin.fedoraproject.org/mailman/listinfo/xen

[Jerry Amundson]

On Thu, Jun 28, 2012 at 9:22 AM, Pasi Kärkkäinen  wrote:
> On Wed, Jun 27, 2012 at 10:40:01PM -0500, Jerry Amundson wrote:
> > On Sat, Jun 9, 2012 at 6:37 AM, Pasi Kärkkäinen  wrote:
> > > On Fri, Jun 08, 2012 at 12:00:44AM -0700, sorabh hamirwasia wrote:
> > > > Hi,
> > > >    I have installed "Xen" on Fedora16 host using "yum install xen" command
> > > >    and it has been installed properly. I can see the changes in
> > > >    /etc/grub2.cfg file too. But when I reboot then the entry for Xen is not
> > > >    listed in the boot menu. On further analyzing I found that in
> > > >    /etc/grub.conf there is no entry related to Xen. Do we need to modify
> > > >    grub.conf manually ? If yes then how to do that. ?
> > > >    Please help me with this.
> > >
> > > You can tweak the Xen hypervisor cmdline options in:
> > > /etc/default/grub file, like this:
> > >
> > > GRUB_DEFAULT="Xen"
> >
> > The only thing I see in fc17 (also) is a
> > set default="Xen"
> > line in /boot/grub2/grub.cfg
> >
> > I've been waiting, hoping, and did a fresh install of Fedora 17, then
> > "yum install xen", in anticipation (again) of Fedora/Xen/dom0 boot
> > magic.
> > Disappointment.
>
> And did you run "grub2-mkconfig -o /boot/grub2/grub.cfg" ?
>
> What's the problem?

FWIW, my original problem, being that the system in question is i686,
was that kernel-PAE had not been installed before xen-hypervisor.
However, even after that the
set default="Xen"
accomplishes nothing as "Xen" does not exactly match the entries put
in place by grub2-mkconfig.

So, getting further along, but still no Xen without manual assistance.

jerry

[Konrad Rzeszutek Wilk]

On Sun, Aug 12, 2012 at 10:49:15PM -0500, Jerry Amundson wrote:
> On Thu, Jun 28, 2012 at 9:22 AM, Pasi Kärkkäinen  wrote:
> > On Wed, Jun 27, 2012 at 10:40:01PM -0500, Jerry Amundson wrote:
> > > On Sat, Jun 9, 2012 at 6:37 AM, Pasi Kärkkäinen  wrote:
> > > > On Fri, Jun 08, 2012 at 12:00:44AM -0700, sorabh hamirwasia wrote:
> > > > > Hi,
> > > > >    I have installed "Xen" on Fedora16 host using "yum install xen" command
> > > > >    and it has been installed properly. I can see the changes in
> > > > >    /etc/grub2.cfg file too. But when I reboot then the entry for Xen is not
> > > > >    listed in the boot menu. On further analyzing I found that in
> > > > >    /etc/grub.conf there is no entry related to Xen. Do we need to modify
> > > > >    grub.conf manually ? If yes then how to do that. ?
> > > > >    Please help me with this.
> > > >
> > > > You can tweak the Xen hypervisor cmdline options in:
> > > > /etc/default/grub file, like this:
> > > >
> > > > GRUB_DEFAULT="Xen"
> > >
> > > The only thing I see in fc17 (also) is a
> > > set default="Xen"
> > > line in /boot/grub2/grub.cfg
> > >
> > > I've been waiting, hoping, and did a fresh install of Fedora 17, then
> > > "yum install xen", in anticipation (again) of Fedora/Xen/dom0 boot
> > > magic.
> > > Disappointment.
> >
> > And did you run "grub2-mkconfig -o /boot/grub2/grub.cfg" ?
> >
> > What's the problem?
>
> FWIW, my original problem, being that the system in question is i686,
> was that kernel-PAE had not been installed before xen-hypervisor.
> However, even after that the
> set default="Xen"
> accomplishes nothing as "Xen" does not exactly match the entries put

Whoops. Did putting 'Xen 4.1.2" do it?
> in place by grub2-mkconfig.
>
> So, getting further along, but still no Xen without manual assistance.
> jerry
>
> xen mailing list
> [e-mail]
> https://admin.fedoraproject.org/mailman/listinfo/xen

[Jerry Amundson]

On 08/13/2012 12:57 PM, Konrad Rzeszutek Wilk wrote:
> On Sun, Aug 12, 2012 at 10:49:15PM -0500, Jerry Amundson wrote:
> > On Thu, Jun 28, 2012 at 9:22 AM, Pasi Kärkkäinen  wrote:
> > > On Wed, Jun 27, 2012 at 10:40:01PM -0500, Jerry Amundson wrote:
> > > > On Sat, Jun 9, 2012 at 6:37 AM, Pasi Kärkkäinen  wrote:
> > > > > On Fri, Jun 08, 2012 at 12:00:44AM -0700, sorabh hamirwasia wrote:
> > > > > > Hi,
> > > > > > I have installed "Xen" on Fedora16 host using "yum install xen" command
> > > > > > and it has been installed properly. I can see the changes in
> > > > > > /etc/grub2.cfg file too. But when I reboot then the entry for Xen is not
> > > > > > listed in the boot menu. On further analyzing I found that in
> > > > > > /etc/grub.conf there is no entry related to Xen. Do we need to modify
> > > > > > grub.conf manually ? If yes then how to do that. ?
> > > > > > Please help me with this.
> > > > >
> > > > > You can tweak the Xen hypervisor cmdline options in:
> > > > > /etc/default/grub file, like this:
> > > > >
> > > > > GRUB_DEFAULT="Xen"
> > > >
> > > > The only thing I see in fc17 (also) is a
> > > > set default="Xen"
> > > > line in /boot/grub2/grub.cfg
> > > >
> > > > I've been waiting, hoping, and did a fresh install of Fedora 17, then
> > > > "yum install xen", in anticipation (again) of Fedora/Xen/dom0 boot
> > > > magic.
> > > > Disappointment.
> > >
> > > And did you run "grub2-mkconfig -o /boot/grub2/grub.cfg" ?
> > >
> > > What's the problem?
> >
> > FWIW, my original problem, being that the system in question is i686,
> > was that kernel-PAE had not been installed before xen-hypervisor.
> > However, even after that the
> > set default="Xen"
> > accomplishes nothing as "Xen" does not exactly match the entries put
>
> Whoops. Did putting 'Xen 4.1.2" do it?

Nope, but
set default="Fedora, with Xen hypervisor"
does work.
At first glance, I didn't see how to fix that, but can look if I get time.

The second problem is that the grub menu entries are built from 
/boot/xen*, but they should not be, as such a list includes xen-syms* 
(not bootable), and symlinks which just repeat entries. [thought I 
brought this up or bz'd this before... hmm.]
I hacked together these changes to 20_linux_xen which worked for me

# diff -u 20_linux_xen*
--- 20_linux_xen        2012-08-13 16:45:17.315983439 -0500
+++ 20_linux_xen~       2012-06-18 15:05:32.000000000 -0500
@@ -23,18 +23,6 @@

. "/usr/share/grub/grub-mkconfig_lib"

-xen_grub_file_is_not_garbage ()
-{
-  if test -f "$1" -a ! -h "$1"; then
-    case "$1" in
-      *-syms-*) return 1 ;;
-    esac
-  else
-    return 1
-  fi
-  return 0
-}
-
  export TEXTDOMAIN=grub
  export TEXTDOMAINDIR="${datarootdir}/locale"

@@ -168,10 +156,7 @@
  if [ "x${linux_list}" = "x" ] ; then
      exit 0
  fi
-xen_try=`for f in /boot/xen*; do
-        if xen_grub_file_is_not_garbage "$f" ; then echo -n "$f " ; fi
-      done`
-xen_list=`for i in $xen_try; do
+xen_list=`for i in /boot/xen*; do
          if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
        done`
  prepare_boot_cache=

[Jerry Amundson]

On Mon, Aug 13, 2012 at 5:06 PM, Jerry Amundson  wrote:
> On 08/13/2012 12:57 PM, Konrad Rzeszutek Wilk wrote:
> > Whoops. Did putting 'Xen 4.1.2" do it?
>
> Nope, but
> set default="Fedora, with Xen hypervisor"
> does work.
> At first glance, I didn't see how to fix that, but can look if I get time.

And it appears that was my fault to begin with as well...
/etc/default/grub contained
GRUB_DEFAULT="Xen"
which was likely added by me. The grub2-tools install owns
/etc/default/grub but does not create one at install. Weird.
Sorry this turned into a grub2 infommercial...

jerry