XenServer 8.0 running a NTP client in guest PVHVM VM

zyash asked:

I would like to run a NTP client in a Xen Linux VM under XenServer (XCP-NG 8.0 to be precise).

The Linux VM, Debian Stretch 9.9 (uname -a: Linux debian 4.9.0-9 amd64 #1 SMP Debian 4.9.168-1+deb9u4 (2019-07-19) x86_64 GNU/Linux has Xen guest tools 8.0 installed and is a PVHVM machine.

The VM is being synchronized to the host /sys/devices/system/clocksource/clocksource0/current_clocksource prints xen

The usual tutorials I found online say to set the xen.independent_wallclock=1 sysctl in VM’s /etc/sysctl.conf and reboot the VM.

However these paths are unavaible to be set in sysctl.

sysctl xen returns only:

Perhaps this has changed in the newest versions.

What would be the equivalent of xen.independent_wallclock that needs to be set?


My answer:

Actually it changed almost a decade ago. independent_wallclock was removed from pvops kernels for HVM/PVHVM domU guests. You don’t need to do anything special now, just run the NTP client as normal.

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