Re: [Xen-users] Guest - slow response to keystroke.

[Stephen Liu <satimis@xxxxxxxxx>]

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

Send instant messages to your online friends http://uk.messenger.yahoo.com 

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users