On 07/30/2012 12:00 PM, Mauricio Tavares wrote: > On Mon, Jul 30, 2012 at 1:50 PM, Eric Blake <eblake@xxxxxxxxxx> wrote: >> On 07/15/2012 07:52 PM, Mauricio Tavares wrote: >>> Right on the top of >>> http://www.centos.org/docs/5/html/5.2/Virtualization/chap-Virtualization-Managing_guests_with_virsh.html, >>> it seems to imply you can load/send scripts to the vm guest using virsh. >>> Is that possible? How and what are the limitations? Can you query the vm >>> guest? >> >> What type of scripts are you talking about? You may be thinking more >> about the capabilities of what libguestfs provides, for modifying disk >> images. In general, virsh itself controls how to start a guest, but not >> the additional layers of communication (such as virtio, qemu-ga, or the >> libguestfs appliance app) required for a host to command a guest to do >> something from within the guest. >> > Basic one would be in case a machine has been paused for a long > time. You know as in "hey, you lazy vm! You have been sleeping for two > weeks! Now your clock is way off and poor ntp can't sync it back. So, > here's current date!" That is something that fits better through qemu-ga, but no one has implemented it yet (cc'ing qemu-devel in case I'm misrepresenting things). Of course, if we did have a qemu-ga command for pushing the current time into the guest, then libvirt could usefully expose an API to wrap that qemu-ga command. -- Eric Blake eblake@xxxxxxxxxx +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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