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On Saturday 21 Jan 2017 00:44:15 Walter Dnes wrote: |
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> I've been using LILO for over 15 years, but I'm a total newbie at |
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> GRUB2, so the following may be totally out to lunch. Would the following |
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> setup work for a USB key with multiple partitions with a different OS or |
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> variant in each partition? |
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> |
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> GRUB2 in MBR |
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It can be the MBR of the USB key, or the MBR of the hard drive. It makes |
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sense it is in the MBR of the USB key of course, but bear in mind some older |
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PCs BIOS will not boot from USB keys. |
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> * extended partition 1 covers entire USB key |
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> * logical partition 5, ext2fs, 1 megabyte, containing directory /boot/grub |
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> containing file menu.lst |
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> * logical partition 6, ext2fs, containing an OS |
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> * logical partition 7, ext2fs, containing an OS |
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> * etc, etc |
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Or, you could just use GPT. |
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> Assuming that the key shows up as /dev/sdb, would the entries in |
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> menu.lst for partions 6 and 7 be (hd1,5) and (hd1,6), respectively? |
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I think you are confusing GRUB2 with the older GRUB legacy? There is no |
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menu.lst with GRUB2. Instead /boot/grub/grub.cfg is generated when you run: |
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grub-mkconfig -o /boot/grub/grub.cfg |
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taking its input from: |
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/etc/default/grub |
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and |
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/etc/grub.d/* |
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The nomenclature for partions 6 and 7 on the USB key will be (hd1,5) and |
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(hd1,6) respectively, as long as the USB key has been detected as the 2nd |
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drive on the PC (/dev/sdb). |
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> And |
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> what would be the command to install GRUB2 to the MBR of the USB key? |
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grub-install -v /dev/sdb |
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and then to create and install its configuration files mount your USB key and |
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run: |
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grub-mkconfig -o /run/media/walter/<USB>/boot/grub/grub.cfg |
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assuming that your USB key has been mounted under /run/media/walter/<USB> |
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and the directory /boot on the USB key is where you want your GRUB2 files |
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installed. |
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Should you need to have a look here as well for additional info: |
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https://wiki.gentoo.org/wiki/GRUB2 |
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https://www.gnu.org/software/grub/manual/grub.html |
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HTH. |
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-- |
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Regards, |
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Mick |
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