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

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.

-- 

Best Regards,

Jiatong Shen
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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