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virtualizace Lunux serveru do VHD souboru

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  • Dobrý den,

    potřeboval bych poradit, máme linux server kde běží 1 web a železo na kterém funguje je hodně zastaralé, jak tento server zvirtualizovat do VHD souboru?

    2. prosince 2013 13:53

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  • Ahoj.

    Tohle se řešilo už nesčetněkrát. Hledej P2V nebo Disk2VHD.

    2. prosince 2013 14:41
  • Tohle jsem nasel na siti:

    1. Boot the machine with a Linux live system

    First step was to boot the machine containing the disk to image, using a Linux live system.

    NOTE: My first idea was to use an Ubuntu Live USB disk, but the  machine did not support booting from USB, so I found it easier to use  an old Knoppix live CD.

    2. Image the disk using dd and pipe the data through ssh

    Then, I copied all the disk content to a file image on my local server using dd and piping the data through ssh:

    $ dd if=/dev/hdX bs=4k conv=noerror,sync | ssh -c blowfish myuser@myserver 'dd of=myfile.dd'

    A few comments here: this method will read all the disk contents, so it can take very long (it took me 5hrs for a 80Gb disk). The bottleneck isn't the network, but really the disk read speed. Before launching the copy, I advice to check the BIOS/disk/system parameters to ensure that the disk and the motherboard are working at their highest possible speed (this can be checked using the command hdparm -i and by running a test with hdparm -Tt /dev/hdX).

    NOTE: dd does not output progress of the operation, but we can force it to do so by sending the USR1 signal to the dd process PID from another terminal:

    $ kill -USR1  PIDofdd

    3. Reclaim the unused space

    At this point, the source machine is no longer needed and we will work exclusively on the destination server (running Linux as well). VirtualBox will be used to convert the raw disk image to the VHD format, but before doing so, we can zero out the unused blocks, so that VirtualBox does not allocate space for them in the final file.

    In order to do so, I mounted the images as a loopback device:

    $ mount -o loop,rw,offset=26608813056 -t ntfs-3g /mnt/mydisk/myfile.dd /mnt/tmp_mnt
    $ cat /dev/zero > zero.file
    $ rm zero.file
    

    NOTE: The offset indicating the beginning of the partition within the disk image can be obtained by using parted on the image file:

    $ parted /mnt/mydisk/myfile.dd
    (parted) unit
    Unit?  [compact]? B
    (parted) print
    Model:  (file)
    Disk /mnt/mydisk/myfile.dd: 80026361856B
    Sector size (logical/physical): 512B/512B
    Partition Table: msdos
    
    Number  Start         End           Size          Type      File system  Flags
     1      32256B        21936821759B  21936789504B  primary   ntfs         boot
     2      21936821760B  80023749119B  58086927360B  extended               lba
     5      26608813056B  80023749119B  53414936064B  logical   ntfs
    

    NOTE2: The default Linux kernel NTFS driver provides read-only access, thus it is necessary to install and use the userspace ntfs-3g driver or writing to the disk will raise an error!

    4. Create the VHD image using VBoxManage

    At this point, we can use the VirtualBox utilities to convert the raw image to a VHD file:

    VBoxManage convertfromraw myfile.dd myfile.vhd --format VHDM.

    2. prosince 2013 14:47
    Moderátor
  • 2. prosince 2013 14:48
    Moderátor