CentOS 5.8. Create image from DomU Ubuntu oneiric. Using LVM.

Part1. Create partition

Сreating file 10 GB for image with the name of Ubuntu11_10Xen.img. It will be placed in the directory of the /var/lib/libvirt/images/.

# dd if=/dev/zero of=/var/lib/libvirt/images/Ubuntu11_10Xen.img bs=512k seek=20480 count=0

by parted add this file geometry of a hard disk that it could handle fdisk

# parted /var/lib/libvirt/images/Ubuntu11_10Xen.img GNU Parted 1.8.1 Using /var/lib/libvirt/images/Ubuntu11_10Xen.img Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) mklabel msdos (parted) quit

#  fdisk /var/lib/libvirt/images/Ubuntu11_10Xen.img last_lba(): I don't know how to handle files with mode 81a4 You must set cylinders. You can do this from the extra functions menu. Command (m for help): x Expert command (m for help): c Number of cylinders (1-1048576): 1305 Expert command (m for help): r Command (m for help): n Command action    e   extended    p   primary partition (1-4) p Partition number (1-4): 1 First cylinder (1-1305, default 1): Using default value 1 Last cylinder or +size or +sizeM or +sizeK (1-1305, default 1305): +240M Command (m for help): n Command action    e   extended    p   primary partition (1-4) e Partition number (1-4): 2 First cylinder (31-1305, default 31): Using default value 31 Last cylinder or +size or +sizeM or +sizeK (31-1305, default 1305): Using default value 1305 Command (m for help): n Command action    l   logical (5 or over)    p   primary partition (1-4) l First cylinder (31-1305, default 31): Using default value 31 Last cylinder or +size or +sizeM or +sizeK (31-1305, default 1305): Using default value 1305 Command (m for help): t Partition number (1-5): 5 Hex code (type L to list codes): 8e Changed system type of partition 5 to 8e (Linux LVM) Command (m for help): p Disk /var/lib/libvirt/images/Ubuntu11_10Xen.img: 0 MB, 0 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes                                      Device Boot      Start         End      Blocks   Id  System /var/lib/libvirt/images/Ubuntu11_10Xen.img1               1          30      240943+ 3  Linux /var/lib/libvirt/images/Ubuntu11_10Xen.img2              31        1305    10241437+   5  Extended /var/lib/libvirt/images/Ubuntu11_10Xen.img5              31        1305    10241406   8e  Linux LVM Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 25: Inappropriate ioctl for device. The kernel still uses the old table. The new table will be used at the next reboot. Syncing disks.

# parted /var/lib/libvirt/images/Ubuntu11_10Xen.img GNU Parted 1.8.1 Using /var/lib/libvirt/images/Ubuntu11_10Xen.img Welcome to GNU Parted! Type 'help' to view a list of commands.  (parted) mkfs 1 ext2                                                      Warning: The existing file system will be destroyed and all data on the partition will be lost. Do you want to continue? parted: invalid token: 1 Yes/No? Yes                                                               Partition number? 1                                                       File system?  [ext2]? (parted) set 1 boot New state?  [on]/off? on                                                  (parted) unit                                                            Unit?  [compact]? B                                                      (parted) print                                                           Model:  (file) Disk /var/lib/libvirt/images/Ubuntu11_10Xen.img: 10737418239B Sector size (logical/physical): 512B/512B Partition Table: msdos Number  Start       End           Size          Type      File system  Flags  1      32256B      246758399B    246726144B    primary   ext2         boot  2      246758400B  10733990399B  10487232000B  extended                    5      246790656B  10733990399B  10487199744B  logical                lvm (parted) quit

Part II. Create LVM

 

#losetup -o 246790656 /dev/loop3 /var/lib/libvirt/images/Ubuntu11_10Xen.img

# pvcreate  /dev/loop3

Writing physical volume data to disk "/dev/loop3"

Physical volume "/dev/loop3" successfully created


сыв


Дщтп

# vgcreate UbuPoltawer /dev/loop3

ваыва


Volume group "UbuPoltawer" successfully created

# vgdisplay

  --- Volume group ---

  VG Name               UbuPoltawer

  System ID           

  Format                lvm2

  Metadata Areas        1

  Metadata Sequence No  1

  VG Access             read/write

  VG Status             resizable

  MAX LV                0

  Cur LV                0

  Open LV               0

  Max PV                0

  Cur PV                1

  Act PV                1

  VG Size               9.77 GB

  PE Size               4.00 MB

  Total PE              2501

  Alloc PE / Size       0 / 0 

  Free  PE / Size       2501 / 9.77 GB

  VG UUID               I5wyHA-07H1-6KNf-3iIH-Vw8Q-ES2m-FrLr4u

Part III. Mount new partition and ran debootstrap

# losetup -o 32256 /dev/loop4 /var/lib/libvirt/images/Ubuntu11_10Xen.img

# vgchange -a y UbuPoltawer

6 logical volume(s) in volume group "UbuPoltawer" now active

# mount -t ext3 -o defaults /dev/UbuPoltawer/root /mnt/PK # mkdir -p /mnt/PK/boot # mount -t ext2 -o defaults /dev/loop4 /mnt/PK/boot # mkdir  -p  /mnt/PK/usr # mount -t ext3 -o defaults /dev/UbuPoltawer/usr /mnt/PK/usr # mkdir  -p /mnt/PK/var # mount -t ext3 -o defaults /dev/UbuPoltawer/var /mnt/PK/var .... # mount -t ext3 -o defaults /dev/UbuPoltawer/tmp /mnt/PK/tmp .... # mount -t ext3 -o defaults /dev/UbuPoltawer/home /mnt/PK/home

# debootstrap --arch amd64 oneiric /mnt/PK ftp://ubuntu-mirror.telesys.org.ua/ubuntu

I: Retrieving Release

I: Retrieving Packages

I: Validating Packages

I: Resolving dependencies of required packages...

I: Resolving dependencies of base packages...

I: Checking component main on ftp://ubuntu-mirror.telesys.org.ua/ubuntu...

I: Retrieving adduser

I: Validating adduser

I: Retrieving apt

I: Validating apt

I: Retrieving apt-utils

I: Validating apt-utils

I: Retrieving base-files

.....

.....

I: Base system installed successfully.