Re: [libvirt] 1. Domain Destroy , 2. Domain boot on a different host and 3. Domain start time

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? 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 ----- From: "Justin Clift" <justin(a)salasaga.org&gt; To: "IKI-サガル　バルウェ" <sagar.barve(a)ikic.co.jp&gt; Cc: <libvir-list(a)redhat.com&gt; 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. > > > >> 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