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Re: [Xen-devel] Re: [Xen-users] XCP/XenServer Migration utility now avai

To: Martinx - ジェームズ <thiagocmartinsc@xxxxxxxxx>
Subject: Re: [Xen-devel] Re: [Xen-users] XCP/XenServer Migration utility now available at xen.org
From: Thomas Halinka <lists@xxxxxxxxx>
Date: Mon, 15 Mar 2010 22:30:35 +0100
Cc: admin@xxxxxxxxxxx, David Markey <david.markey@xxxxxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
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Hi,

Am Montag, den 15.03.2010, 17:59 -0300 schrieb Martinx - ジェームズ:
> Mmmm... Good point but, the LVM within the domU is very useful if you
> resize (append more blocks to the xvda) the virtual disc... Don't you
> think?!

im just resizing the lvols in _dom0_ and do resize2fs in _domU_ using
phy...

  'phy:/dev/vms/guest01-root,sda1,w',

hth,

thomas

> 
> 2010/3/15 David Markey <admin@xxxxxxxxxxx>
>         Well,
>         
>         
>         The partition scheme in your VM is the same before and after
>         the migration.
>         
>         
>         I think any different behaviour is outside the scope of this
>         tool I think.
>         
>         
>         And LVM within a DomU is of limited value anyway :)
>         
>          
>         
>         
>         
>         2010/3/15 Martinx - ジェームズ <thiagocmartinsc@xxxxxxxxx>
>                 Okay!
>                 
>                  Well, since you asked for a feature request! Here's
>                 one!
>                 
>                 * Allow re-create the partition scheme.
>                 
>                 Cheers!  :-D
>                 
>                 
>                 Thiago
>                 
>                 2010/3/15 David Markey <admin@xxxxxxxxxxx>
>                         If your OSS Xen VMs don't have LVM, then they
>                         wont have LVM in XenServer after they are
>                         migrated.
>                         
>                         
>                         
>                         
>                         
>                         2010/3/15 Martinx - ジェームズ
>                         <thiagocmartinsc@xxxxxxxxx>
>                                 Okay but, and my partition scheme?
>                                 Remember that within the XenServer, my
>                                 domUs have its own LVM...
>                                 I can change the fstab and grub's menu
>                                 files before run xva.py but, how to
>                                 make the partitions and the LVM vg /
>                                 lv on the new domU?
>                                 
>                                 
>                                 
>                                 2010/3/15 David Markey
>                                 <admin@xxxxxxxxxxx>
>                                         Sorry,
>                                         
>                                         sed -i.bak -e 's/xvda1/xvda/g'
>                                         -e
>                                          's/xvda2/xvdb/g' /mnt/tmp/etc/fstab 
> /mnt/tmp/boot/grub/menu.lst (or grub.conf)
>                                         
>                                         
>                                         
>                                         
>                                         
>                                         2010/3/15 David Markey
>                                         <admin@xxxxxxxxxxx>
>                                                 No im afraid not.
>                                                 
>                                                 
>                                                 YOU have to make these
>                                                 changes to menu.lst
>                                                 and fstab before
>                                                 migration.
>                                                 
>                                                 
>                                                 If your VMs are the
>                                                 exact same, this
>                                                 should be easily
>                                                 scripted. i.e.
>                                                 
>                                                 
>                                                 vmdisk="/dev/xen/vm1root"
>                                                 
>                                                 
>                                                 mount $vmdisk /mnt/tmp
>                                                 
>                                                 
>                                                 sed -i.bak -e
>                                                 's/xvda1/xvda/g' -e
>                                                  's/xvda2/xvdb/g' 
> /mnt/tmp/etc/fstab /mnt/tmp/etc/fstab
>                                                 
>                                                 
>                                                 umount /mnt/tmp
>                                                 
>                                                 
>                                                 
>                                                 
>                                                 
>                                                 
>                                                 
>                                                 
>                                                 
>                                                 
>                                                 
>                                                 
>                                                 2010/3/15 Martinx -
>                                                 ジェームズ
>                                                 <thiagocmartinsc@xxxxxxxxx>
>                                                         So, your
>                                                         script can
>                                                         make a new
>                                                         partition
>                                                         scheme and a
>                                                         new fstab for
>                                                         my VMs before
>                                                         stream it to
>                                                         the XenServer?
>                                                         Because I have
>                                                         more than 100
>                                                         VMs to
>                                                         copy!  :-/
>                                                         
>                                                         
>                                                         
>                                                         2010/3/15
>                                                         David Markey
>                                                         <admin@xxxxxxxxxxx>
>                                                                 Wow,
>                                                                 what a
>                                                                 pain :)
>                                                                 
>                                                                 
>                                                                 
>                                                                 
>                                                                 
>                                                                 2010/3/15 
> Martinx - ジェームズ <thiagocmartinsc@xxxxxxxxx>
>                                                                         Yeah! 
> Sure!
>                                                                         
>                                                                          
> Today I'm doing this work manually... I mean, to copy a VM from open source 
> Xen to the XenServer I do:
>                                                                         
>                                                                         1- 
> stop the VM on my debian dom0;
>                                                                         2- 
> mount its root file system under /mnt/source;
>                                                                         3- 
> export it via NFS;
>                                                                         4- At 
> the XenServer, I boot the sysrescuecd (a live system);
>                                                                         5- 
> fdisk the /dev/sda;
>                                                                         6- 
> create the LVM volumes;
>                                                                         7- 
> mount /dev/vg01/root under /mnt/target;
>                                                                         8- 
> mount /dev/sda1 under /mnt/target/boot;
>                                                                         9- 
> mount the debian dom0 nfs server under /mnt/source;
>                                                                         10- 
> cp /mnt/source/* /mnt/target/
>                                                                         11- 
> edit the /etc/fstab and the grub's menu;
>                                                                         12- 
> shutdown the VM;
>                                                                         13- 
> Convert it from HVM to PVM;
>                                                                         14- 
> start the VM;
>                                                                         
>                                                                         
>                                                                         
>                                                                         
> Thanks,
>                                                                         Thiago
>                                                                         
>                                                                         
> 2010/3/15 David Markey <admin@xxxxxxxxxxx>
>                                                                               
>   If you change xvda1 to xvda, change xvda2 to xvdb it will work fine.
>                                                                               
>   
>                                                                               
>   
>                                                                               
>   Change references in /boot/grub/menu.lst of xvda1 to xvda
>                                                                               
>   
>                                                                               
>   
>                                                                               
>   Change references in /etc/fstab of xvda1 to xvda, and xvda2 to xvdb.
>                                                                               
>   
>                                                                               
>   
>                                                                               
>   
>                                                                               
>   
>                                                                               
>   Understand?
>                                                                               
>   
>                                                                               
>   
>                                                                               
>   
>                                                                               
>   2010/3/15 Martinx - ジェームズ <thiagocmartinsc@xxxxxxxxx>
>                                                                               
>           Exactly!
>                                                                               
>           
>                                                                               
>            The first one is for my domU hosted at my open source Xen (powered 
> by Debian), the second fstab, is the new one, used for my guests hosted at my 
> XenServers.
>                                                                               
>           
>                                                                               
>           
>                                                                               
>           
>                                                                               
>           Thanks!
>                                                                               
>           Thiago
>                                                                               
>           
>                                                                               
>           2010/3/15 David Markey <admin@xxxxxxxxxxx>
>                                                                               
>                   I'm confused,
>                                                                               
>                   
>                                                                               
>                   
>                                                                               
>                   You supply 2 fstabs there, one using LVM, one without. 
> Which one is it?
>                                                                               
>                   
>                                                                               
>                   
>                                                                               
>                   
>                                                                               
>                   
>                                                                               
>                   
>                                                                               
>                   
>                                                                               
>                   2010/3/15 Martinx - ジェームズ <thiagocmartinsc@xxxxxxxxx>
>                                                                               
>                   
>                                                                               
>                   
>                                                                               
>                           Hi David!
>                                                                               
>                           
>                                                                               
>                            My Xen domU in my open source dom0 (Debian) have 
> this configuration file:
>                                                                               
>                           
>                                                                               
>                           ----
>                                                                               
>                           bootloader  = '/usr/bin/pygrub'
>                                                                               
>                           extra       = 'console=hvc0'
>                                                                               
>                           memory      = '64'
>                                                                               
>                           disk        = [
>                                                                               
>                           
>                                                                               
>                           'phy:/dev/HyperVG01/guest01-root,xvda1,w',
>                                                                               
>                           
>                                                                               
>                           'phy:/dev/HyperVG01/guest01-swap,xvda2,w',
>                                                                               
>                                         ]
>                                                                               
>                           name        = 'guest01'
>                                                                               
>                           vif         = [ 'mac=00:01:64:4b:0d:2e, 
> vifname=guest01-eth0, bridge=eth0' ]
>                                                                               
>                           on_poweroff = 'destroy'
>                                                                               
>                           on_reboot   = 'restart'
>                                                                               
>                           on_crash    = 'restart'
>                                                                               
>                           ----
>                                                                               
>                           
>                                                                               
>                            My guest01 /etc/fstab file:
>                                                                               
>                           
>                                                                               
>                           proc            /proc           proc    defaults    
>     0       0
>                                                                               
>                           /dev/xvda1      /               ext3    
> relatime,errors=remount-ro 0       1
>                                                                               
>                           /dev/xvda2      none            swap    sw          
>     0       0
>                                                                               
>                           
>                                                                               
>                            BUT, this is for open source Xen domU, within the 
> XenServer, the guest01 should be:
>                                                                               
>                           
>                                                                               
>                           proc            /proc           proc    defaults    
>     0       0
>                                                                               
>                           /dev/xvda1      /boot           ext2    defaults    
>     0       2
>                                                                               
>                           /dev/mapper/vdwuaf1-root /               ext3    
> errors=remount-ro 0       1
>                                                                               
>                           /dev/mapper/vdwuaf1-swap_1 none            swap    
> sw              0       0
>                                                                               
>                           
>                                                                               
>                            And the partition table of the guest01:
>                                                                               
>                           
>                                                                               
>                           guest01:~# fdisk -lu /dev/xvda
>                                                                               
>                           
>                                                                               
>                           Disk /dev/xvda: 8589 MB, 8589934592 bytes
>                                                                               
>                           255 heads, 63 sectors/track, 1044 cylinders, total 
> 16777216 sectors
>                                                                               
>                           Units = sectors of 1 * 512 = 512 bytes
>                                                                               
>                           Disk identifier: 0x0009c181
>                                                                               
>                           
>                                                                               
>                           
>                                                                               
>                           Device Boot      Start         End      Blocks   Id 
>  System
>                                                                               
>                           /dev/xvda1   *          63      498014      248976  
>  83  Linux
>                                                                               
>                           /dev/xvda2          498015    16771859     8136922+ 
>  8e  Linux LVM
>                                                                               
>                           
>                                                                               
>                            You tool can recreate the partition scheme? Or it 
> just copy the domU as is?
>                                                                               
>                            I have many others domU like this to copy...
>                                                                               
>                           
>                                                                               
>                           Thanks!
>                                                                               
>                           Thiago
>                                                                               
>                           
>                                                                               
>                           2010/3/15 David Markey <admin@xxxxxxxxxxx>
>                                                                               
>                           
>                                                                               
>                           
>                                                                               
>                                   If anyone has feature requests, direct them 
> here.
>                                                                               
>                                   
>                                                                               
>                                   
>                                                                               
>                                   The next feature i'll be working on is 
> supporting kernels loaded from the Dom0. The kernel images will have to be 
> copied to the XenServer/XCP Dom0.
>                                                                               
>                                   
>                                                                               
>                                   
>                                                                               
>                                   
>                                                                               
>                                   
>                                                                               
>                                   
>                                                                               
>                                   
>                                                                               
>                                   
>                                                                               
>                                   
>                                                                               
>                                   2010/3/12 Martinx - ジェームズ 
> <thiagocmartinsc@xxxxxxxxx>
>                                                                               
>                                           
>                                                                               
>                                           Really COOL!!! I'm doing all this 
> work manually until now!
>                                                                               
>                                           
>                                                                               
>                                           
>                                                                               
>                                           
>                                                                               
>                                           On 12 March 2010 15:33, David 
> Markey <david.markey@xxxxxxxxxx> wrote:
>                                                                               
>                                                   Hi all,
>                                                                               
>                                                   
>                                                                               
>                                                   A new python based 
> migration utility for migrating your xend virtual machines to XCP  is now 
> available at:
>                                                                               
>                                                   
>                                                                               
>                                                   
> http://www.xen.org/products/cloud_projects.html
>                                                                               
>                                                   
>                                                                               
>                                                   It can generate XVAs from 
> your xend based HVM and paravirtualised virtual machines.
>                                                                               
>                                                   It can also steam your VM 
> directly to a XenServer/XCP host over HTTP or HTTPS.
>                                                                               
>                                                   
>                                                                               
>                                                   Please read the README for 
> pointers and guidelines on how to prepare your VMs for migration to XCP. Most 
> PV based virtual machines will need some preparation work.
>                                                                               
>                                                   
>                                                                               
>                                                   
>                                                                               
>                                                   Thanks to Stephen Spector 
> and Dave Scott!
>                                                                               
>                                                   
>                                                                               
>                                                   Enjoy,
>                                                                               
>                                                   
>                                                                               
>                                                   David
>                                                                               
>                                                   
>                                                                               
>                                                   
> _______________________________________________
>                                                                               
>                                                   Xen-users mailing list
>                                                                               
>                                                   
> Xen-users@xxxxxxxxxxxxxxxxxxx
>                                                                               
>                                                   
> http://lists.xensource.com/xen-users
>                                                                               
>                                           
>                                                                               
>                                           
>                                                                               
>                                           
>                                                                               
>                                           
>                                                                               
>                                           
> _______________________________________________
>                                                                               
>                                           Xen-devel mailing list
>                                                                               
>                                           Xen-devel@xxxxxxxxxxxxxxxxxxx
>                                                                               
>                                           http://lists.xensource.com/xen-devel
>                                                                               
>                                           
>                                                                               
>                                   
>                                                                               
>                                   
>                                                                               
>                           
>                                                                               
>                   
>                                                                               
>                   
>                                                                               
>           
>                                                                               
>           
>                                                                               
>   
>                                                                               
>   
>                                                                         
>                                                                         
>                                                                 
>                                                                 
>                                                         
>                                                         
>                                                 
>                                                 
>                                         
>                                         
>                                 
>                                 
>                         
>                         
>                 
>                 
>         
>         
> 
> _______________________________________________
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