There are many variables and unknowns related to what you want to do depending on how the original VM was built and installed. I have used the guidelines below to do the same sort of things you are wanting to do.
Modify the /etc/fstab entries so that they point to the correct new locations. Some locations probably use labels (LABEL=/boot etc) and from what I gather from your email you are no longer using LVM and are only using 1 partition. If this is correct you would need to comment out old the entry that point to /home and modify the line for / so that it points to the correct device (/dev/vdy1). You didn't mention what you are doing about swap so that is an exercise left up to you. Shutdown the VM and connect a CentOS 6 CD to it and boot it using the CD and enter rescue mode. You'll be asked a few questions to get things started. When prompted to scan for existing installations yes/ok. If you have things copied over and have corrected the fstab file it should find the install and mount it all under /mnt/sysimage. If the install was found and mounted you should be able to install grub using the following. At the shell prompt type the following chroot /mnt/sysimage grub-install --no-floppy --recheck /dev/vdy If the grub-install command is successful type exit to leave the chroot and exit 1 more time to reboot. In theory the VM should be able to successfully boot using the new image file but there could be some issues depending on how things got copied from the old system. In cases similar to what you have I usually just spin up a new VM make a copy of the /etc directory on the new system to /etc.old then use rsync to copy everything from the old VM excluding things like /proc, /sys, /dev, /var/log, and /boot (unless you really need something in it). Once the rsync completes I restore the /etc/fstab file and things like the /etc/sysconfig/network-scripts/ifcfg* files from the /etc.old directory. If you did rsync /boot you should probably run the same sort of grub-install command listed above before rebooting. This usually works like a charm for any distribution as long as you know what crucial files that need to be restored. Good luck -- David On Tue, 2019-04-23 at 15:05 -0700, Robert Citek wrote: > Greetings, > > How can I turn a VM with two virtual disks into a VM with a single > virtual > disk that boots? > > I have a VM with two virtual disks, running CentOS 6.10. The first > disk > (vda) has the MBR and all the boot files, i.e. vda1 is eventually > mounted > at /boot. The second disk (vdb) has an LVM partition at vdb1 and > contains > three LVs: lv_root (/), lv_home (/home), and swap. What I want is a > single > disk (e.g. vdy) that contains all the files on a single partition > (vdy1) > and can boot. And I almost have that. > > That is, I detached all the disks from the original VM, created a > separate > temporary VM with a new disk (vdy), and attached and mounted the > disks from > the original VM. I then partitioned, formatted, and mounted vdy1 at > /mnt/vdy1/. All the lv_root files were copied to /mnt/vdy1. All the > lv_home files were copied to /mnt/vdy1/home. And all the /boot files > were > copied to /mnt/vdy1/boot. Given that the system is CentOS 6.1 and > runs > grub 0.97, how can I install Grub at vdy from this temporary VM? > > I imagine I have to modify /boot/grub/device.map, > /boot/grub/grub.conf, and > /etc/fstab on the /mnt/vdy1 filesystem, and then run some grub > commands. > > Thanks in advance for any pointers and guidance. > > Regards, > - Robert > _______________________________________________ > PLUG mailing list > PLUG@pdxlinux.org > http://lists.pdxlinux.org/mailman/listinfo/plug _______________________________________________ PLUG mailing list PLUG@pdxlinux.org http://lists.pdxlinux.org/mailman/listinfo/plug