Setting Time options

[NetRock]

Hi ...

I have a network time server, all the machines are set to sync the time with this server on the network.
Running Linux and Windows KVMs on each Proxmox 4.0 node. I am looking to find the best option to set time:

1) In the BIOS: There are two options; UTC or Local Time which one to set.
2) for Linux and Windows KVMs should i enable "use local time for RTC", If yes, what would be the right option in the BIOS (UTC or Local time).
3) Do i need to make any changes in the host.

I have looked in different threads but was not able to find the proper answer to my questions.
It would be great, if someone can direct me to the right direction to avoid having time drift on all the VMs and the hosts.
Appreciate your help........

Thank you.

 

[manu]

Hi
Your PVE host expects the BIOS clock to be set o UTC. PVE will add then a time zone so you get a correct localtime.
For your guests VM, PVE will automatically set the right parameter depending on the ostype you selected so there is nothing to do here.

 

[luxmux]

Hi
Your PVE host expects the BIOS clock to be set o UTC. PVE will add then a time zone so you get a correct localtime.
For your guests VM, PVE will automatically set the right parameter depending on the ostype you selected so there is nothing to do here.

Is there a way to disable this? So that PVE uses local or not to expect that BIOS is set to UTC?

 

[BobhWasatch]

timedatectl set-local-rtc 1

But why do you want to do that? It is a bad idea. From the man page:

 Note that maintaining the RTC in the local timezone is not fully supported and will
 create various problems with time zone changes and daylight saving adjustments. If at
 all possible, keep the RTC in UTC mode.

The only reason to do this is dual-booting with Windows. There is no other use case.

 

[luxmux]

timedatectl set-local-rtc 1

But why do you want to do that? It is a bad idea. From the man page:

 Note that maintaining the RTC in the local timezone is not fully supported and will
 create various problems with time zone changes and daylight saving adjustments. If at
 all possible, keep the RTC in UTC mode.

The only reason to do this is dual-booting with Windows. There is no other use case.

Yeah it makes sense that it can create issue. So is there anyway I can adjust monitoring time, for graphs, because this seems to affect other parts as well. All my other monitoring graphs show utc time instead of local, even if the vm time is set to local.

 

[BobhWasatch]

What time zone is your browser set to? Have you cleared the cache?

 

[luxmux]

What time zone is your browser set to? Have you cleared the cache?

Yep cleared cache and time zone is GMT -5, same as local. I checked on multiple browsers and machines, it's the same issue.

 

[BobhWasatch]

Log in to the PVE host as root. Run "dpkg-reconfigure tzdata" and select your time zone. Reboot. Log in again and verify the time is correct. If not use "timedatectl" to set it.

Log in to the PVE web GUI as root. Go to server> Time> Edit and set your time zone.

If that does not work I don't know what is wrong. Probably you have configured something somewhere because this is not a known problem with PVE.