On 8/3/2010 2:27 PM, James Hogarth wrote: > I normally use a live CD for this sort of thing... in that case you > don't need to cheroot at all. Just make sure your > <rootmountpoint>/boot/grub/device.map is correct and do grub-install > --root-directory=<rootmountpoint> /dev/sda (assuming you want the mbr on > sda) I am booting from the installation DVD. Is that what you mean by a live CD ? When I boot from that, will it necessarily have a correct /boot/grub/device.map ? If not, then mounting my boot and root partitions and doing a chroot was needed. If so, then I did too much work. > > James > > On 3 Aug 2010 18:21, <m.roth at 5-cent.us > <mailto:m.roth at 5-cent.us>> wrote: > > Edward Diener wrote: > >> On 8/3/2010 11:13 AM, Les Mikesell wrote: > >>> On 8/3/2010 9:56 AM, Edward Diener wrote: > >>>> > >>>> I am at the shell prompt but in order to get grub to work, don't I > need > >>>> to mount my actual boot and root partitions for grub to know that > >>>> (hd0,9) refers a valid boot partition when I tell grub: > >>>> > >>>> root (hd0,9) > >>>> setup (hd0,9) > >>> > >>> No, grub doesn't need to have anything mounted. > >> > >> OK, thanks for the info. > >> > >>> The sysimage mount and > >>> chroot is most useful to get access to your usual tools in their usual > >>> paths and to be able to edit the grub.conf file. I've never tried to > >>> boot from a partition that far into the disk, though. I had enough > >>> trouble back in the days when bios only knew 1024 cylinders that I've > >>> always put a small /boot partition as the first thing on the disk even > >>> though you shouldn't have to now. > >> > >> My problem was that once I did a chroot I did not have any /dev devices. > >> Evidently grub does use this. Once I did: > >> > >> mount --bind /dev /mnt/sysimage/dev > >> > >> before doing: > >> > >> chroot /mnt/sysimage > >> > >> when I executed 'grub' it found the (hd0,9) partition. > > > > "Executed grub"? Not chroot, then grub-install /dev/sda? > > <snip> > > mark > > > > > > _______________________________________________ > > CentOS mailing list > > CentOS at centos.org > <mailto:CentOS at centos.org> > > http://lists.centos.org/mailman/listinfo/centos > > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos