UsingUUID
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Since Edgy, Ubuntu requires the use of '''UUID''' or '''LABEL''' (for filesystems including swap), or udev-created symlinks (for removable media like CDROMs and USB drives). Directly using {{{/dev/hd*}}} or {{{/dev/sd*}}} is no longer supported (since these device assignments can change from boot to boot): * all filesystems should be specified by {{{UUID=}}} or {{{LABEL=}}} * all physical devices should be specified by a symlink (e.g. {{{/dev/cdrom}}}, {{{/dev/disk/by-id/...}}}, etc.) The files for which this is most critical are: * {{{/boot/grub/menu.lst}}} * {{{/etc/fstab}}} * {{{/etc/initramfs-tools/conf.d/resume}}} === Finding === UUIDs can be determined using the {{{vol_id}}} command. For example, to find the UUID for the filesystem on {{{/dev/sda1}}}: {{{ $ sudo /sbin/vol_id -u /dev/sda1 79415992-7093-4a0e-a2e5-4574ed702d05 }}} Symlinks created by udev can be found by searching for the target device in {{{/dev}}}. For example, to find {{{/dev/sda1}}}: {{{ $ ls -la /dev/disk/by-id | grep /sda1$ lrwxrwxrwx 1 root root 10 8207-06-10 02:46 ata-ST2250823AS_3ND277BL-part1 -> ../../sda1 lrwxrwxrwx 1 root root 10 8207-06-10 02:46 scsi-1ATA_ST2250823AS_3ND277BL-part1 -> ../../sda1 }}} === Converting === To perform these UUID lookups and corrections automatically (which should have already happened during the Dapper to Edgy upgrade) please use: * For {{{/boot/grub/menu.lst}}}: {{{ sudo update-grub }}} * For {{{/etc/fstab}}}: {{{ sudo rm -f /etc/fstab.pre-uuid sudo /var/lib/dpkg/info/volumeid.postinst configure }}} * For {{{/etc/initramfs-tools/conf.d/resume}}}, there is no automatic procedure: * Verify that {{{RESUME=}}} matches your {{{swap}}} line in {{{/etc/fstab}}} * After any adjustment, run {{{sudo update-initramfs -u}}} |
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UsingUUID (last edited 2008-08-06 16:59:35 by localhost)