Re: Determining when a guest booted / how long it's been running
On 10/1/20 3:42 AM, Digimer wrote:
Hi all,
Is there a way to tell when a tool made a change to guest (ie: used
virt-manager to make a change)? Following, is there a way to check to
see if there are changes queued to take effect when the guest next reboots?
You can listen for events. For changes to inactive XML you will get
VIR_DOMAIN_EVENT_DEFINED+VIR_DOMAIN_EVENT_DEFINED_UPDATED lifecycle
event (+reason) and for changes to live XML (like hotplug and hotunplug)
you'll get DEVICE_ADDED or DEVICE_REMOVED.
But there is no API/virsh command that you could call to get the
timestamp of last modification. You have to listen for events.
And the second question - you can dump live and inactive XML and see if
there is any difference (modulo runtime configuration from live XML).
The live XML should be strictly bigger than inactive XML, meaning live
XML should be inactive XML + runtime info. But again, no API there,
because changes to inactive XML can be done any time - libvirt keeps
live and inactive XMLs separately.
If either of the above are not possible, is there a way to see
when a
guest last booted or how long a guest has been running?
Again, if listening to evens - libvirt emits one when a guest is
started. But I don't think we store a timestamp of start anywhere nor
expose it through an API. Maybe there is some indirect way?
Michal