Package: grub-pc Version: 1.96+20080724-16 Severity: normal I want to use /dev/mapper/khyber-test1--root as the base device for a KVM instance. I don't need partitions and just want to use the "drive" directly. Thus, I tried to install grub2 on it, but have failed miserably, due to grub2 trying to be so smart that it won't do the things I ask it to.
I understand that there's something going on about LVM and that grub-install stops at the abstraction layer and tries to access the drives below, but even with grub-setup, I am not arriving. Anyway, first things first: -- Setup # mount /dev/mapper/khyber-test1--root /mnt2 -- Try grub-install # grub-install --root-directory=/mnt2 /dev/mapper/khyber-test1--root grub-probe: error: no mapping exists for `khyber-test1-root' Auto-detection of a filesystem module failed. Please specify the module with the option `--modules' explicitly. > This should use /mnt2/boot/grub/device.map, but even if I add > a mapping to (hd0) to /dev/mapper/khyber-test1--root > to that file, the error stays the same. I also tried to modify > /boot/grub/device.map (the SYSTEM's device.map), but without any > change in result. I think the problem is that grub-install has been made to be super-convenient and finds an LVM volume, tries to find the components, and might even find /dev/md0 and /dev/sd[abcd] of the host system, but those are obviously very wrong in the context of the virtual machine. I thus abandoned this path and turned to grub-setup, which is more bare-bones than grub-install: -- Create a core.img file # grub-mkimage -d /mnt2/usr/lib/grub/i386-pc -p /mnt2/boot/grub -o /mnt2/boot/grub/core.img -v grub-mkimage: info: getting the size of /mnt2/usr/lib/grub/i386-pc/kernel.img grub-mkimage: info: the total module size is 0xc grub-mkimage: info: reading /mnt2/usr/lib/grub/i386-pc/kernel.img grub-mkimage: info: getting the size of /mnt2/usr/lib/grub/i386-pc/kernel.img grub-mkimage: info: kernel_img=0x19ce300, kernel_size=0x7910 grub-mkimage: info: the core size is 0x45b9 grub-mkimage: info: getting the size of /mnt2/usr/lib/grub/i386-pc/diskboot.img grub-mkimage: info: reading /mnt2/usr/lib/grub/i386-pc/diskboot.img grub-mkimage: info: getting the size of /mnt2/usr/lib/grub/i386-pc/diskboot.img grub-mkimage: info: writing 0x200 bytes grub-mkimage: info: the first module address is 0x0 grub-mkimage: info: writing 0x45b9 bytes -- Create device.map # cat <<_eof > /mnt2/boot/grub/device.map (hd0) /dev/mapper/khyber-test1--root _eof -- Use grub-setup # grub-setup -d /mnt2/boot/grub -v '(hd0)' grub-setup: info: the size of hd0 is 1953525168 grub-setup: info: opening the device `/dev/sda' grub-setup: info: the size of hd0 is 1953525168 grub-setup: info: opening the device `/dev/sda' grub-setup: info: the size of hd0 is 1953525168 grub-setup: info: opening the device `/dev/sda1' grub-setup: info: opening the device `/dev/sda1' grub-setup: info: the size of hd0 is 1953525168 grub-setup: info: the size of hd0 is 1953525168 grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: the size of hd0 is 1953525168 grub-setup: info: the size of hd1 is 1953525168 grub-setup: info: opening the device `/dev/sdb' grub-setup: info: the size of hd1 is 1953525168 grub-setup: info: opening the device `/dev/sdb' grub-setup: info: the size of hd1 is 1953525168 grub-setup: info: opening the device `/dev/sdb1' grub-setup: info: opening the device `/dev/sdb1' grub-setup: info: the size of hd1 is 1953525168 grub-setup: info: the size of hd1 is 1953525168 grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: the size of hd1 is 1953525168 grub-setup: info: the size of hd2 is 1953525168 grub-setup: info: opening the device `/dev/sdc' grub-setup: info: the size of hd2 is 1953525168 grub-setup: info: opening the device `/dev/sdc' grub-setup: info: the size of hd2 is 1953525168 grub-setup: info: opening the device `/dev/sdc1' grub-setup: info: opening the device `/dev/sdc1' grub-setup: info: the size of hd2 is 1953525168 grub-setup: info: the size of hd2 is 1953525168 grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: the size of hd2 is 1953525168 grub-setup: info: the size of hd3 is 1953525168 grub-setup: info: opening the device `/dev/sdd' grub-setup: info: the size of hd3 is 1953525168 grub-setup: info: opening the device `/dev/sdd' grub-setup: info: the size of hd3 is 1953525168 grub-setup: info: opening the device `/dev/sdd1' grub-setup: info: opening the device `/dev/sdd1' grub-setup: info: the size of hd3 is 1953525168 grub-setup: info: the size of hd3 is 1953525168 grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: the size of hd3 is 1953525168 grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda1' grub-setup: info: opening the device `/dev/sda1' grub-setup: info: the size of hd0 is 1953525168 grub-setup: info: opening the device `/dev/sda' grub-setup: info: the size of hd0 is 1953525168 grub-setup: info: the size of hd0 is 1953525168 grub-setup: info: opening the device `/dev/sda1' grub-setup: info: opening the device `/dev/sda1' grub-setup: info: opening the device `/dev/sda1' grub-setup: info: the size of hd0 is 1953525168 grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: opening the device `/dev/sda2' grub-setup: info: the size of hd0 is 1953525168 grub-setup: info: opening the device `/dev/sda' grub-setup: info: the size of hd1 is 1953525168 grub-setup: info: the size of hd1 is 1953525168 grub-setup: info: the size of hd1 is 1953525168 grub-setup: info: opening the device `/dev/sdb1' grub-setup: info: opening the device `/dev/sdb1' grub-setup: info: opening the device `/dev/sdb1' grub-setup: info: the size of hd1 is 1953525168 grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: opening the device `/dev/sdb2' grub-setup: info: the size of hd1 is 1953525168 grub-setup: info: opening the device `/dev/sdb' grub-setup: info: the size of hd2 is 1953525168 grub-setup: info: opening the device `/dev/sdc' grub-setup: info: the size of hd2 is 1953525168 grub-setup: info: the size of hd2 is 1953525168 grub-setup: info: opening the device `/dev/sdc1' grub-setup: info: opening the device `/dev/sdc1' grub-setup: info: opening the device `/dev/sdc1' grub-setup: info: the size of hd2 is 1953525168 grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: opening the device `/dev/sdc2' grub-setup: info: the size of hd2 is 1953525168 grub-setup: info: opening the device `/dev/sdc' grub-setup: info: the size of hd3 is 1953525168 grub-setup: info: the size of hd3 is 1953525168 grub-setup: info: the size of hd3 is 1953525168 grub-setup: info: opening the device `/dev/sdd1' grub-setup: info: opening the device `/dev/sdd1' grub-setup: info: opening the device `/dev/sdd1' grub-setup: info: the size of hd3 is 1953525168 grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: opening the device `/dev/sdd2' grub-setup: info: the size of hd3 is 1953525168 grub-setup: info: opening the device `/dev/sdd' grub-setup: info: changing current directory to /dev/mapper grub-setup: info: getting the size of /mnt2/boot/grub/boot.img grub-setup: info: reading /mnt2/boot/grub/boot.img grub-setup: info: getting the size of /mnt2/boot/grub/boot.img grub-setup: info: getting the size of /mnt2/boot/grub/core.img grub-setup: info: reading /mnt2/boot/grub/core.img grub-setup: info: getting the size of /mnt2/boot/grub/core.img grub-setup: info: the size of hd0 is 1953525168 grub-setup: info: setting the root device to `khyber-test1-root' grub-setup: info: dos partition is -1, bsd partition is -1 grub-setup: info: will embed the core image at sector 0x1 grub-setup: info: opening the device `/dev/sda' grub-setup: info: opening the device `/dev/sda' grub-setup: info: opening the device `/dev/sda' grub-setup: info: opening the device `/dev/sda' > I find it very disturbing that grub touches /dev/sd[abcd], the > drives of the host system. Even though I told it to use > /mnt2/boot/grub as the base directory, it seems to use the > device.map file in /boot/grub, although it seems to use the right > boot.img and core.img files. > > ** Is this a separate bug? ** -- Try grub-setup more explicitly # grub-setup -d /mnt2/boot/grub -m /mnt2/boot/grub/device.map -v '(hd0)' grub-setup: info: the size of hd0 is 20971520 grub-setup: info: opening the device `/dev/mapper/khyber-test1--root' grub-setup: info: the size of hd0 is 20971520 grub-setup: info: opening the device `/dev/mapper/khyber-test1--root' grub-setup: info: the size of hd0 is 20971520 grub-setup: info: the size of hd0 is 20971520 grub-setup: info: changing current directory to /dev/mapper grub-setup: info: getting the size of /mnt2/boot/grub/boot.img grub-setup: info: reading /mnt2/boot/grub/boot.img grub-setup: info: getting the size of /mnt2/boot/grub/boot.img grub-setup: info: getting the size of /mnt2/boot/grub/core.img grub-setup: info: reading /mnt2/boot/grub/core.img grub-setup: info: getting the size of /mnt2/boot/grub/core.img grub-setup: error: no mapping exists for `khyber-test1-root' > Now it appears to be using the right "drive" (judging from the > size and the fact that there's only one), but then it does some > /dev/mapper magic which I didn't ask it to do. In the end, it > cannot find the mapping. I also tried to add mappings for > "khyber-test1-root" and > "khyber-test1--root" (i.e. without the /dev/mapper/ > prefix), but without success. -- Try a chroot approach # for i in proc sys dev; do mount --bind /$i /mnt2/$i; done # chroot /mnt2 grub-setup -v '(hd0)' grub-setup: info: the size of hd0 is 20971520 grub-setup: info: opening the device `/dev/mapper/khyber-test1--root' grub-setup: info: the size of hd0 is 20971520 grub-setup: info: opening the device `/dev/mapper/khyber-test1--root' grub-setup: info: the size of hd0 is 20971520 grub-setup: info: the size of hd0 is 20971520 grub-setup: info: changing current directory to /dev/mapper grub-setup: info: getting the size of /boot/grub/boot.img grub-setup: info: reading /boot/grub/boot.img grub-setup: info: getting the size of /boot/grub/boot.img grub-setup: info: getting the size of /boot/grub/core.img grub-setup: info: reading /boot/grub/core.img grub-setup: info: getting the size of /boot/grub/core.img grub-setup: error: no mapping exists for `khyber-test1-root' > The exact same result (and also for grub-install)... It turns out that grub2 cannot install itself onto just any block device because it tries to be too smart. I think grub-setup (and grub-install) need a flag with which I can tell them that I don't want them to decompose the device I give, but just use it directly, o.g. grub-install --root-directory=/mnt2 --use-device-directly /dev/mapper/khyber-test1--root -- System Information: Debian Release: squeeze/sid APT prefers unstable APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental') Architecture: amd64 (x86_64) Kernel: Linux 2.6.29-1-amd64 (SMP w/1 CPU core) Locale: LANG=en_GB, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash -- .''`. martin f. krafft <[email protected]> Related projects: : :' : proud Debian developer http://debiansystem.info `. `'` http://people.debian.org/~madduck http://vcs-pkg.org `- Debian - when you have better things to do than fixing systems
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