[SOLVED] QEMU/KVM clocks

Apr 26, 2018
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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. :)
 
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.
 
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! :)
 
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