libvirt users - Jul 2022 - how to get vm uptime through libvirt api

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

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 Pr?vozn?k <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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