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Azure Virtual Machines
An Azure service that is used to provision Windows and Linux virtual machines.
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I launched the official RHEL 8.8 image and confirmed the configuration. You can update yours as necessary to match or utilize the PTP configuration
Default chrony.conf:
If you want to utilize PTP follow the steps below:
Confirm you have ptp hyperlink setup:
[root@dehermanrhel azureuser]# ls -l /dev/ptp_hyperv
lrwxrwxrwx. 1 root root 4 Sep 10 17:38 /dev/ptp_hyperv -> ptp0
If not, add the udev rule and reload:
$ sudo cat > /etc/udev/rules.d/99-ptp_hyperv.rules << EOF
ACTION!="add", GOTO="ptp_hyperv"
SUBSYSTEM=="ptp", ATTR{clock_name}=="hyperv", SYMLINK += "ptp_hyperv"
LABEL="ptp_hyperv"
EOF
$ sudo udevadm control --reload
$ sudo udevadm trigger --subsystem-match=ptp --action=add
Once this is setup you can configure /etc/chrony.conf and add these lines:
refclock PHC /dev/ptp_hyperv poll 3 dpoll -2 offset 0 stratum 2
makestep 1.0 -1
More details can be found on the RHEL documentation Configuring NTP Using the chrony Suite.Hope this helps! Let me know if you still have questions.
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