[SOLVED] QEMU/KVM clocks

[upnort]

Does Proxmox control the internal internal clock of QEMU/KVMs?

I also use VirtualBox and that software does control the clock of the VM. Hence my question if Proxmox does likewise.

I found information about clocks on QEMU/KVM systems, but I am unable to determine whether syncing the clock to a time server inside the VM is required.

Thanks again.

 

[janos]

cat /sys/devices/system/clocksource/clocksource0/current_clocksource

 

[upnort]

Oops! My mistake. I was focusing on Windows based KVMs. That is, do the Windows KVMs need to time sync or does the Proxmox host control the clock?

 

[Richard]

Oops! My mistake. I was focusing on Windows based KVMs. That is, do the Windows KVMs need to time sync or does the Proxmox host control the clock?

Proxmox host syncs.

 

[Hollis]

or
apt-get install ntp
in KVM for public NTP server

 

[GadgetPig]

Hello upnort,

IIRC ProxMox is preconfigured OOB to timesync to time server. Any VM/CT created will use the same time as the ProxMox server. So make sure you set the correct timezone for your Proxmox server under Proxmox gui > datacenter > yourproxmoxservername> time.

https://pve.proxmox.com/wiki/Configuration_of_Time_Syncronization_(NTP)

Some useful commands:

# timedatectl status
(view time sync status)

and

# cat /etc/systemd/timesyncd.conf
(view current and fallback NTP servers)

There is information about the "use local time for rtc" VM hardware option here (by default it's off, and I usually don't mess with this setting)
https://forum.proxmox.com/threads/how-local-time-for-rtc-affect-on-the-vms.11830/

For me personally I still setup an external timeserver on Windows Server VM's
https://timetoolsltd.com/time-sync/how-to-synchronize-microsoft-windows-to-a-ntp-server/

regards!

 

[upnort]

Proxmox host syncs.

Any VM/CT created will use the same time as the ProxMox server.

This is all I wanted to know. Perhaps this information is in the Proxmox docs, but likely I missed the obvious statement.

Thanks.