[libvirt] Regarding lxc driver for libvirt.

[Daniel P. Berrange]

On Fri, Feb 05, 2010 at 04:01:34PM +0530, Kumar L Srikanth-B22348 wrote:
> Hi,
> I am new to libvirt.
> I want to create a Domain using libvirt XML. In order to mount the
> host's '/home/srikanth' directory to the new container's '/' directory,
> my XML format is shown below:
> 
> <domain type='lxc' id='1'>
>   <name>container1_vm</name>
>     <memory>500000</memory>
>       <os>
>           <type>exe</type>
>           <init>/bin/sh</init>
>       </os>
>       <vcpu>1</vcpu>
>       <clock offset='utc'/>
>       <on_poweroff>destroy</on_poweroff>
>       <on_reboot>restart</on_reboot>
>       <on_crash>destroy</on_crash>
>       <devices>
>         <emulator>/usr/libexec/libvirt_lxc</emulator>
>   	<filesystem type='mount'>
> 	  <source dir='/home/srikanth'/> 
> 	  <target dir='/'/> 
> 	</filesystem>
> 	<console type='pty' />
>       </devices>
> </domain>
> 
> 
> With the above libvirt XML, Domain is defining, but not starting. When I
> issue the start command it's saying "Domain started", but showing "shut
> off" status. If I changed the target directory(<traget dir='/'/>) from
> '/' to '/home/container1'(<traget dir='/home/container1'/>), the domain
> is starting normally and I am able to see the contents in the target
> directory.
> 
> Can you please let me know, how can I set the target directory to '/'?

The path specified in the <init> element must be visible from within
the container's virtual root  filesystem. Since you are trying to
make '/home/srikanth' the root of the container, this implies that
the <init> element you give will expect a file 

   /home/srikanth/bin/sh

in the host, which will be accessed as /bin/sh within the container.

Daniel
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