CentOS 5 :: Can't Get Framebuffer On DomU

Mar 28, 2009

I installed Centos5.2 and have created 1 instance so far. It all works great, but when I created the new instance (using command line from ssh and "virt-install") it gave a message saying probing for video, not found, assuming headless and on I went with the install.

But now I have need for a framebuffer because I have a JBOSS/Java Captcha routine which throws an error if it can't use the X11 libraries or some such (I've resolved this before on a headless Amazon instance once by just running "Xorg"). But I can't run Xorg on my DomU because it can't find the fb device!

So, I searched around and did a makedev -d /dev/fb to create it, but it still doesn't work, because, I assume, the hardware isn't found anywhere. So... how do I get Xorg to work in this case? Or do I need to re-do the virt install and somehow force it to find video hardware (but how?)

Here is some salient output:

root@virty{/etc/X11}: uname -a
Linux virty 2.6.18-92.1.22.el5xen #1 SMP Tue Dec 16 12:26:32 EST 2008 x86_64 x86_64 x86_64 GNU/Linux
root@domU{/etc/X11}: uname -a

[Code].....

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Problems with xen 3.1.2 creating and installing domU CentOS 5.5 I am trying to do a virt-install --prompt --paravirt, and the install error out while trying to download install RPMs. I have googled for xen centos virt-install and various permutations. I have found similar howtos for 5.4 and 5.3, but they resulted in the same outcome. I did find several posts with similar issues, but no solution was posted.[URL]..

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Apr 25, 2009

I have a problem with a VM running Centos 5.3 on a Centos 5.2 hypervisor. Any kernel install makes the system unbootable and I have to copy an old /boot directory to get it to boot again. After some investigation I found that grub was always failing. These are the partitions I have. xvda is the OS virtual drive. xvda1 is the /boot partitition and xvda2 is the LVM partition. A standard default install.

cat /proc/partitions
major minor #blocks name
202 0 14648448 xvda
202 1 104391 xvda1
202 2 14538825 xvda2
202 16 195313152 xvdb
202 17 195310206 xvdb1
253 0 11337728 dm-0
253 1 2031616 dm-1
253 2 190840832 dm-2

Apparently, this file could be suspect. But it seems to be OK according to what I have read.
cat /boot/grub/device.map
# this device map was generated by anaconda
(hd0) /dev/xvda

If I try to re-install grub I get...
Attempt 1)
grub-install hd0
/dev/xvda1 does not have any corresponding BIOS drive.

Attempt 2)
grub-install /dev/xvda
expr: non-numeric argument
/dev/xvda1 does not have any corresponding BIOS drive.

Attempt 3)
grub-install --recheck hd0
Probing devices to guess BIOS drives. This may take a long time.
No suitable drive was found in the generated device map.
Reverting to backed up copy.

Attempt 4)
grub-install --recheck /dev/xvda
Probing devices to guess BIOS drives. This may take a long time.
No suitable drive was found in the generated device map.
Reverting to backed up copy.

Attempt 5)
grub
Probing devices to guess BIOS drives. This may take a long time.

GNU GRUB version 0.97 (640K lower / 3072K upper memory)
[Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists the possible completions of a device/filename.]
grub> root (hd0,0)
root (hd0,0)
Error 21: Selected disk does not exist

This is my grub.conf file...
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that all kernel and initrd paths are relative to /boot/, e.g.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
# initrd /initrd-version.img
#boot=/dev/xvda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-128.1.6.el5xen)
root (hd0,0)
kernel /vmlinuz-2.6.18-128.1.6.el5xen ro root=/dev/VolGroup00/LogVol00
initrd /initrd-2.6.18-128.1.6.el5xen.img

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# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface

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This worked well in that the initial PXE boot failed and the machine shut down. When I start it now it seems to actually boot Vista, but I just can't see it! It goes as far as saying "Booting from Hard Disk..." in the viewer window and then doesn't update, although the disk activity and CPU usage are very similar to a machine booting Vista to the login prompt.

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I installed CentOS 5.5 x86_64 on server as xen dom0. When i try to install CentOS 5.5 x86_64 as guest (hardware virtualization) i see "Kernel panic"...Installation not started: i see install cd's boot menu, press Enter... that's all.

Dom0 kernel: 2.6.18-194.26.1.el5xen, xen 3.0.3
Only standart installation, repo's and update's...

Code: 8b 72 40 48 8d 4c 24 1c 48 8b 7a 20 ba c4 01 00 00 e8 5f 77
RIP [<ffffffff8008192f>] cpuid4_cache_lookup+0x256/0x356
RSP <ffff81010fc75d60>[code]....

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[code]....

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Console output:
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[168960.072209] Not tainted 3.16.0-4-amd64 #1
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[168960.072220] jbd2/xvda2-8 D ffff8803e72946e8 0 139 2 0x00000000

[code]....

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[Code].....

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[Edit: also, I should have made the title more descriptive, but apparently I can't edit that ]

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Code:
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