вівторок, 1 травня 2012 р.

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.

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