UsingUUID
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Comment: add vol_id example
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UUIDs can be determined using the {{{vol_id}}} command. For example: {{{ sudo /sbin/vol_id -u /dev/sda1 }}} |
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To perform these renamings (which should have already happened during the Dapper to Edgy upgrade) please use: | === Finding === |
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* {{{/boot/grub/menu.lst}}}: | 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}}}: |
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* {{{/etc/fstab}}}: | * For {{{/etc/fstab}}}: |
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* {{{/etc/initramfs-tools/conf.d/resume}}}: | * For {{{/etc/initramfs-tools/conf.d/resume}}}, there is no automatic procedure: |
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 /usr/sbin/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
UsingUUID (last edited 2008-08-06 16:59:35 by localhost)