how to get vm uptime through libvirt api

[Jiatong Shen]

Thank you very much for reply. Initially my thought of uptime is equal to
executing to `uptime` inside a virtual machine.
as for the second case, where virtual machine is paused for a period, does
libvirt expose an api to get how long qemu process
has existed?

thank you.

Best,
Norman

On Tue, Jul 26, 2022 at 3:16 PM Michal Prívozník <mprivozn at redhat.com>
wrote:

> On 7/26/22 08:49, Jiatong Shen wrote:
> > Hello community,
> >
> >    I would like to know if there is an api to get a virtual machine's
> > uptime. Thank you in advance for the help.
>
> There's no such API because not even qemu guest agent has an explicit
> API for that. However, it has an API to execute binaries:
>
> # virsh qemu-agent-command --pretty $dom '{"execute":"guest-exec",
> "arguments":{"path":"uptime", "capture-output":true}}'
> {
>   "return": {
>     "pid": 1174
>   }
> }
>
>
> # virsh qemu-agent-command --pretty $dom
> '{"execute":"guest-exec-status", "arguments":{"pid":1174}}'
> {
>   "return": {
>     "exitcode": 0,
>     "out-data":
>
> "IDA5OjEwOjU4IHVwIDggbWluLCAgMSB1c2VyLCAgbG9hZCBhdmVyYWdlOiAwLjAwLCAwLjA5LCAwLjA4Cg==",
>     "exited": true
>   }
> }
>
>
> $ echo
>
> "IDA5OjEwOjU4IHVwIDggbWluLCAgMSB1c2VyLCAgbG9hZCBhdmVyYWdlOiAwLjAwLCAwLjA5LCAwLjA4Cg=="
> | base64 -d
>  09:10:58 up 8 min,  1 user,  load average: 0.00, 0.09, 0.08
>
>
> But it also depends what exactly do you mean by 'uptime'. Because if I
> start a guest, then pause it for 5 minutes and then let it run again,
> what should 'uptime' refer to?
>
> Michal
>
>

-- 

Best Regards,

Jiatong Shen
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