Thanks a lot Justin for such a
detailed explanation.
I understood now what the destroy function
does. As for "domainUndefine":
To quote from the "undefine"
method's documentation:
Undefine a domain but does not stop it
if it is running
So, If the Domain remains as it
is, what is the significance of removing the XML
Description/Definition?
What I want to do, is to remove the Domain
completely from the system, including its associated virtual disks. Is
there any way to do this using the API?
>> Secondly, Is it possible to boot
a domain on a completely different physical
>> host with the same
Hypervisor configuration?
>
> You can use libvirt for this, but
it's not automatic. As far as I know,
> you'll need to have your
software connect to each of the servers and
> launch the appropriate
virDomainCreate() (and probably other) commands.
> So, it would be up
to your application to make sure that the domain is
> not running on
server A, before you launch it on server B.
I am sorry, but I did not get this quite
completely. Could you please explain this a bit more? Especially the "it
would be up to your application to make sure that the domain is
not running
on server A, before you launch it on server B" part. Firstly, how will I
get the domain from server A to server B to launch it there? By migrating it to
server B?
Please help.
Thanks and Regards
Sagar
Barve
----- Original Message -----
Sent: Thursday, June 17, 2010 5:17
PM
Subject: Re: [libvirt] 1. Domain Destroy ,
2. Domain boot on a different host and 3. Domain start time
> On 06/17/2010 05:50 PM, IKI-サガル バルウェ wrote:
>>
Hello,
>>
>> Firstly, I have some confusion about the libvirt
API "virDomainDestroy"
>> method. here is the link to
API:
>> http://libvirt.org/html/libvirt-libvirt.html#virDomainDestroy
>
> "Destroy" here can be a bit
confusing. It doesn't really touch or
> remove the disk data.
"Destroy" in this case means to destroy just the
> running instance of the
domain. i.e. stop running it, free up the
> memory that was
allocated to it, and free up any devices (network
> resource, etc) that
had been assigned to it.
>
> If the domain has an XML definition
for it in place, the "Destroy"
> command won't touch it. You can
start the domain again using the
> "Create" function:
>
> http://libvirt.org/html/libvirt-libvirt.html#virDomainCreate
>
> If you want to get rid of an XML
definition for the domain from a
> server, the command you're looking for
is "undefine":
>
> http://libvirt.org/html/libvirt-libvirt.html#virDomainUndefine
>
>
>> Secondly, Is it possible
to boot a domain on a completely different physical
>> host with the
same Hypervisor configuration?
>> For. E.g: if I have a domain on a
host 192.168.101.1 running Xen with a
>> Domain "test" in shutdown
state. If I have to start/boot the domain "test"
>> on a different
physical host, running Xen say 192.168.101.2, is it possible
>> using
libvirt API? If not, then is there any other method to do it?
>
>
You can use libvirt for this, but it's not automatic. As far as I
know,
> you'll need to have your software connect to each of the servers
and
> launch the appropriate virDomainCreate() (and probably other)
commands.
> So, it would be up to your application to make sure that
the domain is
> not running on server A, before you launch it on server
B.
>
>
>> Thirdly, Is there a method to get the total
running time of a domain? I
>> mean, the amount of time since the
domain had been booted. Currently, I can
>> fetch the CPU time. But, is
this the exact amount of time the domain is ON?
>> i.e. If the domain
is in a "IDLE" state, the CPU time does not increase. But
>> what I
want is the amount of time the domain was ON(including the idle
>>
time). So, If I can get the start time of the domain, I can calculate
the
>> duration.
>
> Sorry, I personally can't help with
this one. I haven't had to look at
> this stuff yet.
>
> Hope the above stuff helps though. :)
>
> Regards and best
wishes,
>
> Justin Clift
>
> --
>
Salasaga - Open Source eLearning
IDE
>
http://www.salasaga.org