Re: [Xen-users] Get Network on DomU + Parsing multiple Guest Domains with lvm usage

[Alexandre Kouznetsov <alk@xxxxxxxxxx>]

Hello.

El 12/09/13 06:24, Dorian escribió:
> I'm in the process of testing Xen 4.0 on §Debian Squeeze install.
> I've a working Xen Hypervisor on Debian Squeeze
> [...]
>
> I installed 2 Debian squeeze volumes with debootstrap and xm created
> them. Log in is succesfull.
> I installed 1 Ubuntu Lucid volume, but creating fails using
> root@debian:/home/dorian# xm create Machin-bizarre-ubu.net.cfg (same
> command as for the Debian images)
> Error: Unable to open config file: Machin-bizarre-ubu.net.cfg
> Usage: xm create <ConfigFile> [options] [vars]
xm complains that it can not read the config file. This means, between 
other things, that it did not parsed it yet, so whatever happens with 
the storage is irrelevant on this stage.
Make sure Machin-bizarre-ubu.net.cfg is the correct config file name. 
Remember that the file names in Linux are case-sensitive.
> Is there anything special regarding creating Ubuntu image?
No, except that usually you use pygrub as the boot loader with Ubuntu, 
while in case of Debian DomU sometines it's easer to specify the kernel 
and initrd directly, it will load them from Dom0 filesystem.
> Cc the llogical volumes, following the beginners tutorial, one tell to
> create pv then vg and, might I be misleaded, lv. I made at first thought
> multiple lv io to use seperate lv per DomU created but the command to
> create DomU doesn't take argument to bind the DomU to the lv (I had 3
> lv  like /dev/Esp-Virt/Vol1 - Vol2 & Vol3) Using all the extent of the
> vg, When I went to install with debootstrap I had no space as a
> consequence. So I deleted the Vol1,2 &3. Recalling what lvcreate stands
> for, I remain dubious (what stands it for if Icannot bind to it? I only
> suppose lvremove stands for destroying the DomU -
> Machin-bizarre.ubu.net-disk and swap for instance)?
Sorry, your explanation is little bit confusing, but I still hope I can 
answer this.
While using LVM as storage for DomUs, as initial setup you usually 
define some block device(s) as one (or several) Physical Volume, then 
create a Volume Group and you are done. After that you 
create/remove/resize Logical Volumes as need them.
In case of Xen over Debian, I would recommend to use xen-tools instead 
of debootstrap directly. I can also create the necessary  Logical 
volumes an generate a nice config file.
> CC debootstrap, does it physically install a cd image on a
> sub-directory? How can I find it out (install dir)? 'cause for each
> newly created DomU I 've to take usage of the internet and/or exploit my
> / ( maybe the lvm volmuewhere I created a vg, to get it simple)
> partition, increasing the occupied storage capcity. Can I use a previous
> debootstrap image and install the extra guests from there? Maybe other
> caveats , but I assume you know better how I summarise it.
debootstrap does not need to use a CD image (unless it's specified as 
Debian Repository), the most common way is to make it pull packages from 
network. It does store a copy of the downloaded packages within the 
target directory tree.
https://wiki.debian.org/Debootstrap

You can deploy Debian DomU from a master image instead of 
debootstrapping each of them. Personally, I tried that but then found 
that xen-tools if the easiest and most flexible way to deploy machines. 
The master image became outdated soon enough to justify a new deploy 
each time.
Please consider to board different questions in different threads.

Greetings.

--
Alexandre Kouznetsov


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