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  6. What Should I Do If No Partition Is Found During the Startup of an ECS Created Using a Private Image That Is Created Using an External Image File?

What Should I Do If No Partition Is Found During the Startup of an ECS Created Using a Private Image That Is Created Using an External Image File?

The disk partition ID changes and the image cannot query the partition name using the original partition ID. You need to change the partition name to UUID=UUID of the disk partition.

The following uses openSUSE 13.2 as an example to describe how to change the partition name.

  1. Run the following command to query the disk partition ID:

    ls -l /dev/disk/by-id/

    The example command output is as follows.

    total 0
    lrwxrwxrwx 1 root root 10 Jul 22 01:35 ata-QEMU_HARDDISK_QM00001 -> ../../xvda
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 ata-QEMU_HARDDISK_QM00001-part1 -> ../../xvda1
    lrwxrwxrwx 1 root root 12 Jul 22 01:35 ata-QEMU_HARDDISK_QM00001-part10 -> ../../xvda10
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 ata-QEMU_HARDDISK_QM00001-part2 -> ../../xvda2
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 ata-QEMU_HARDDISK_QM00001-part5 -> ../../xvda5
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 ata-QEMU_HARDDISK_QM00001-part6 -> ../../xvda6
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 ata-QEMU_HARDDISK_QM00001-part7 -> ../../xvda7
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 ata-QEMU_HARDDISK_QM00001-part8 -> ../../xvda8
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 ata-QEMU_HARDDISK_QM00001-part9 -> ../../xvda9
    lrwxrwxrwx 1 root root 10 Jul 22 01:35 ata-QEMU_HARDDISK_QM00005 -> ../../xvde
    lrwxrwxrwx 1 root root 10 Jul 22 01:35 scsi-SATA_QEMU_HARDDISK_QM00001 -> ../../xvda
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 scsi-SATA_QEMU_HARDDISK_QM00001-part1 -> ../../xvda1
    lrwxrwxrwx 1 root root 12 Jul 22 01:35 scsi-SATA_QEMU_HARDDISK_QM00001-part10 -> ../../xvda10
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 scsi-SATA_QEMU_HARDDISK_QM00001-part2 -> ../../xvda2
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 scsi-SATA_QEMU_HARDDISK_QM00001-part5 -> ../../xvda5
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 scsi-SATA_QEMU_HARDDISK_QM00001-part6 -> ../../xvda6
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 scsi-SATA_QEMU_HARDDISK_QM00001-part7 -> ../../xvda7
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 scsi-SATA_QEMU_HARDDISK_QM00001-part8 -> ../../xvda8
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 scsi-SATA_QEMU_HARDDISK_QM00001-part9 -> ../../xvda9
    lrwxrwxrwx 1 root root 10 Jul 22 01:35 scsi-SATA_QEMU_HARDDISK_QM00005 -> ../../xvde

    ata-QEMU_HARDDISK_xxx and scsi-SATA_QEMU_HARDDISK_xxx indicate that the disk of the ECS is simulated using Quick EMUlator (QEMU). The content at the left of -> is the disk partition ID, and that at the right of -> is the partition name.

  2. Run the following command to query the disk partition UUID:

    ls -l /dev/disk/by-uuid/

    The example command output is as follows.

    total 0
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 45ecd7a0-29da-4402-a017-4564a62308b8 -> ../../xvda5
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 55386c6a-9e32-41d4-af7a-e79596221f51 -> ../../xvda9
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 55f36660-9bac-478c-a701-7ecc5347f789 -> ../../xvda8
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 780f36bc-0ada-4c98-9a8d-44570d65333d -> ../../xvda1
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 b3b7c47f-6a91-45ef-80d6-275b1cc16e19 -> ../../xvda6
    lrwxrwxrwx 1 root root 11 Jul 22 01:35 ea63b55d-3b6e-4dcd-8986-956b72bac3e9 -> ../../xvda7
    lrwxrwxrwx 1 root root 12 Jul 22 01:35 eb3cc645-925e-4bc5-bedf-c2a6f3b65809 -> ../../xvda10

    The content at the left of -> is the disk partition UUID, and that at the right of -> is the partition name. Obtain the relationship between the disk partition name, partition ID, and partition UUID.

  3. Run the following command to check the partition names in the /etc/fstab file:

    vi /etc/fstab

    The example command output is as follows.

    /dev/disk/by-id/scsi-SATA_QEMU_HARDDISK_QM00001-part5 / ext3 defaults,errors=panic 1 1
    /dev/disk/by-id/scsi-SATA_QEMU_HARDDISK_QM00001-part1 /boot ext3 defaults,errors=panic 1 2
    /dev/disk/by-id/scsi-SATA_QEMU_HARDDISK_QM00001-part6 /home ext3 nosuid,errors=panic 1 2
    /dev/disk/by-id/scsi-SATA_QEMU_HARDDISK_QM00001-part10 /opt ext3 defaults,errors=panic 1 2
    /dev/disk/by-id/scsi-SATA_QEMU_HARDDISK_QM00001-part7 /tmp ext3 nodev,nosuid,errors=panic 1 2
    /dev/disk/by-id/scsi-SATA_QEMU_HARDDISK_QM00001-part9 /usr ext3 defaults,errors=panic 1 2
    /dev/disk/by-id/scsi-SATA_QEMU_HARDDISK_QM00001-part8 /var ext3 nodev,nosuid,errors=panic 1 2
    sysfs /sys sysfs noauto 0 0
    proc /proc proc defaults 0 0
    usbfs /proc/bus/usb usbfs noauto 0 0
    devpts /dev/pts devpts mode=0620,gid=5 0 0
    /dev/cdrom /media/ udf,iso9660 noexec,noauto,nouser,nodev,nosuid 1 2
    tmpfs /dev/shm tmpfs noexec,nodev,nosuid 0 0

    The values in the first column are the disk partition IDs.

  4. Press i to enter editing mode. Change the disk partition ID in the row that contains /dev/disk/xxx in the /etc/fstab file in step 3 to UUID=UUID of the disk partition based on the query results in step 1 and step 2.
    The modified content is as follows.
    UUID=45ecd7a0-29da-4402-a017-4564a62308b8 / ext3 defaults,errors=panic 1 1
    UUID=780f36bc-0ada-4c98-9a8d-44570d65333d /boot ext3 defaults,errors=panic 1 2
    UUID=b3b7c47f-6a91-45ef-80d6-275b1cc16e19 /home ext3 nosuid,errors=panic 1 2
    UUID=eb3cc645-925e-4bc5-bedf-c2a6f3b65809 /opt ext3 defaults,errors=panic 1 2
    UUID=ea63b55d-3b6e-4dcd-8986-956b72bac3e9 /tmp ext3 nodev,nosuid,errors=panic 1 2
    UUID=55386c6a-9e32-41d4-af7a-e79596221f51 /usr ext3 defaults,errors=panic 1 2
    UUID=55f36660-9bac-478c-a701-7ecc5347f789 /var ext3 nodev,nosuid,errors=panic 1 2
    sysfs /sys sysfs noauto 0 0
    proc /proc proc defaults 0 0
    usbfs /proc/bus/usb usbfs noauto 0 0
    devpts /dev/pts devpts mode=0620,gid=5 0 0
    /dev/cdrom /media/ udf,iso9660 noexec,noauto,nouser,nodev,nosuid 1 2
    tmpfs /dev/shm tmpfs noexec,nodev,nosuid 0 0
    NOTE:

    Ensure that the UUIDs are correctly modified so that ECSs can start properly.

  5. Press Esc, enter :wq, and press Enter. The system saves the configuration and exits the vi editor.
  6. Check the partition names in the system boot configuration file.

    The system boot configuration files for different OSs vary. Confirm the boot configuration file of the current OS.

    • Grand Unified Boot Loader (GRUB) configuration file
      • /boot/grub/grub.conf
      • /boot/grub/menu.lst
      • /boot/grub/grub.cfg
      • /boot/grub2/grub.cfg
    • Syslinux configuration file
      • /extlinux.conf
      • /boot/syslinux/extlinux.conf
      • /boot/extlinux/extlinux.conf
      • /boot/syslinux/syslinux.cfg
      • /syslinux/syslinux.cfg
      • /syslinux.cfg

    The boot file in this example is /boot/grub/menu.lst. Run the following command to check it:

    vi /boot/grub/menu.lst

    default 0
    timeout 3
    title xxx Server OS - xxxxxx
    kernel /boot/vmlinuz-3.0.101-0.47.52-default root=/dev/disk/by-id/scsi-SATA_QEMU_HARDDISK_QM00001-part5 resume= memmap=0x2000000$0x3E000000 nmi_watchdog=2 crashkernel=512M-:256M console=ttyS0,115200 console=tty0 xen_emul_unplug=all
    initrd /boot/initrd-3.0.101-0.47.52-default
  7. Press i to enter editing mode and change the partition names in the system boot configuration file.

    Change the disk partition name in the /boot/grub/menu.lst file in 6 to UUID=UUID of the disk partition based on the query results in 1 and 2.

    default 0
    timeout 3
    title xxx Server OS - xxxxxx
    kernel /boot/vmlinuz-3.0.101-0.47.52-default root=UUID=45ecd7a0-29da-4402-a017-4564a62308b8 resume= memmap=0x2000000$0x3E000000 nmi_watchdog=2 crashkernel=512M-:256M console=ttyS0,115200 console=tty0 xen_emul_unplug=all
    initrd /boot/initrd-3.0.101-0.47.52-default
  8. Press Esc, enter :wq, and press Enter. The system saves the configuration and exits the vi editor.