[CentOS-virt] Centos 5.5 KVM GRUB / Virtio issue
kbass at kenbass.com
Wed Jan 12 12:48:52 EST 2011
I have a virtual machine that had been running fine using a RAW disk
I am in the process of converting this virtual machine to use a single
LVM and virtio. (For LVM backup snapshots and easy resizing purposes (no
LVM within the guest))
I create the LVM and copied all the files from the existing RAW image to
an ext3 under the LVM.
However, I cannot get it to boot. It has to do with GRUB and I cannot
figure out why the stupid thing is not working as it should.
I boot the guest using the Centos 5.5 DVD and select Rescue and chroot
fdisk -l shows:
Disk /dev/vda: 21.4 GB, 21474836480 bytes
213 heads, 34 sectors/track, 5791 cylinders
Units = cylinders of 7242 * 512 = 3707904 bytes
Device Boot Start End Blocks Id System
/dev/vda1 1 5792 20970496 83 Linux
cat /boot/grub/device.map shows:
However grub cannot find the /boot/grub/stage1.
I ran grub and did the following:
device (hd0) /dev/vda
Filesystem type is ext2fs, partition type 0x83
Checking if "/boot/grub/stage1" exists... no
Checking if "/grub/stage1" exists... no
Error 2: Bad file or directory type
Error 15: File not found
However, there is most definitely a /boot/grub/stage1 in the (hd0,1) - I
copied the entire boot directory from the RAW IDE image to the LVM.
Even 'find /sbin/init' fails. Now find works at all.
My host is Fedora 14.
What is odd is that I created a different virtual machine by going
through the whole Centos 5.5 DVD Install process and that one works. In
this non working case, I've copied the files over to the LVM and it
seems GRUB is the only issue/difference. I can boot the DVD installed
one and run the above grub find command and it finds the stage1 fine.
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