All,
I am playing with virtualization on centos 5. I took my old redhat 7 disks and created a 10GIG virtual disk, I installed redhat 7. Now I am trying to get the EXACT image copied off of my actual redhat 7 disk so that I know it is the same (including all patches, updates and OTHER things I did to it that I have forgotten about).
I booted the redhat 7 image just fine at this point. I also copied it for backup so I dont have to install again.
So on my centos 5 box I mounted the image with a loop command. mount -t ext3 -o loop,offset=32256 redhat7.img /mnt/image This works fine.
Then I logged into the redhat 7 system and executed the command tar --exclude ./proc --exclude ./mnt --exclude ./sys --exclude ./dev -cvf - . | ssh root@192.168.1.8 "( cd /mnt/image ; tar xvpf -)"
Where 192.168.1.8 is my centos 5 box and /mnt/image the mounted image.
The copy seems to go fine. But after I do this when I try to virtualize the redhat7 image it stops at: GRUB
When I copy the second image back on top of the first image it then boots again. So glad I made that copy of the image file.
What is happening with the tar command that is messing up grub and keeping it from booting?
Thanks,
Jerry
On Sat, 2007-10-27 at 13:50 -0400, Jerry Geis wrote:
All,
I am playing with virtualization on centos 5.
<snip>
What is happening with the tar command that is messing up grub and keeping it from booting?
The master boot record (MBR) usually isn't contained in the file system, so tar has no way of copying it.
I recently backed up a small laptop (not enough memory to install Linux, but enough to run it) using g4l, then restored the g4l backup into a qemu virtual disk image. It wouldn't boot. I had to connect a distribution CD iso image, boot into rescue mode, then use the command
grub-install /dev/hda
to make it bootable.
Hope this helps, Rich
Thanks,
Jerry _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
On 10/27/07, Jerry Geis geisj@pagestation.com wrote:
All,
I am playing with virtualization on centos 5. I took my old redhat 7 disks and created a 10GIG virtual disk, I installed redhat 7. Now I am trying to get the EXACT image copied off of my actual redhat 7 disk so that I know it is the same (including all patches, updates and OTHER things I did to it that I have forgotten about).
I booted the redhat 7 image just fine at this point. I also copied it for backup so I dont have to install again.
So on my centos 5 box I mounted the image with a loop command. mount -t ext3 -o loop,offset=32256 redhat7.img /mnt/image This works fine.
Then I logged into the redhat 7 system and executed the command tar --exclude ./proc --exclude ./mnt --exclude ./sys --exclude ./dev -cvf - . | ssh root@192.168.1.8 "( cd /mnt/image ; tar xvpf -)"
You should use -v only in the second tar, if not every file is logged twice, just a trick.
Where 192.168.1.8 is my centos 5 box and /mnt/image the mounted image.
The copy seems to go fine. But after I do this when I try to virtualize the redhat7 image it stops at: GRUB
If I had to do the same thing myself, trying to make it simple and maximize my chances of success. I would have first installed a minimal RH7 on the disk image, then made a backup of /boot and /boot/grub/grub.conf. Also on my original rh7 I would have installed a xen kernel using : rpm -ivh kernel-xen?????.rpm. (the same as the one running on my xen system) Then copied all the files, like you did (using tar and ssh).
Then restoring /boot/grub/grub.conf and kernel related /boot/initrd?????
Et voila :-)
Anyway the hardest part is to have grub correctly installed and a well configured initrd pre-boot image.
Regards.
When I copy the second image back on top of the first image it then boots again. So glad I made that copy of the image file.
What is happening with the tar command that is messing up grub and keeping it from booting?
Thanks,
Jerry _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
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Alain Spineux -
Jerry Geis -
Rich Huff