Hi Thomas,
Thanks for your advice.
--- Thomas Halinka <lists@xxxxxxxxx> wrote:
> Am Freitag, den 28.11.2008, 09:09 +0800 schrieb Stephen Liu:
> > Hi folks,
> >
> >
> > Host - Debian Etch
> > Guests - Debian Etch.
> >
> >
> > Performed following steps to create duplicate guest, a mail server.
>
> i hope you stopped the server before copying...
> >
> >
> > 1)
> > # cp /etc/xen/guest-1.cfg /etc/xen/guest-2.cfg
> >
> >
> > edit guest-2.cfg changing the settings of:-
> > disk = ['file:/vserver/domains/guest-2_directory/disk.img,hda1,w',
> > 'file:/vserver/domains/guest-2_directory/swap.img,hda2,w']
> >
> > # Hostname
> > name = 'guest-2_hostname'
> >
> > # Networking
> > vif = ['ip=guest-2_localIP, mac=00:16:3E:C2:AA:77']
>
> did you alter the mac-address?
No, I did not make any change on MAC. I have been playing round on
this practice sometimes to duplicate guest image. IIRC touching MAC
resulting in other guests/host can't ping this guest.
> > 2)
> > # mkdir /vserver/domains/guest-2_directory
> >
> > # cp /vserver/domains/guest-1_directory/disk.img
> > /vserver/domains/guest-2_directory/
> >
> > # cp /vserver/domains/guest-1_directory/swap.img
> > /vserver/domains/guest-2_directory/
> >
> >
> > 3)
> > Start guest-2 and login with password of guest-1
> >
> > Edit /etc/hosts, /etc/hostname, /etc/network/interfaces,
> root_password,
> > user_passwords, etc.
>
> instead of this you could also loopback-mount in dom0
>
> mount -o loop /vserver/domains/guest-2_directory/disk.img /mnt
> chroot /mnt && do your stuff
> exit && xm create xyz
Whether editing the data on chroot environment. On exiting a new
disk.img will be created with all new data included? What about the
swap.img?
> > 4)
> > Restart guest-2 and login with new data. The new mail server,
> guest-2,
> > is working.
> >
> >
> > But occasionally I found running both guest-1 and guest-2
> > simultaneously slow response to keystroke will occur on either of
> them.
>
> sounds strange :)
I still can't explain. It happens occasionally. If only running the
new guest or its master it never happens.
> > I have to sit back and wait. Please advise where shall I check
> and
> > how to fix this problem? TIA
> >
> >
> > Besides, is there a better way to clone a guest on the same Xen
> box?
>
> use lvm and snapshots.... i often prepare master-images in lvols and
> each guest works on a snapshot of this.
Could you please explain in more detail? Thanks. There is no
partition on the Xen box using the entire HD.
> I love this CoW-Stuff :)
Whether you meant;
Copy-on-write;
http://en.wikipedia.org/wiki/Copy_on_write
http://www.etherboot.org/wiki/cow
Pointers would be appreciated. TIA
B.R.
Stephen
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