Unable to sync to NTP server
 

Make sure that your host is having similar/correct DNS servers throughout the pool

1 Add all xenserver Public NTP servers to the host . Refer below link for the same.

https://support.citrix.com/article/CTX121278

Note: Make sure that you have identical and equal number of NTP source servers on all xenserver host in pool 

2. It will automatically restart the chronyd service but sometimes that does not sync the time to NTP and we have to manually restart the chronyd service

use below command to restart chronyd service
 

# systemctl restart chronyd.service

If even after manually restarting the service it does not work then follow below steps

3. Stop chronyd service using below command

# Systemctl stop chronyd.service

4. Manually sync xenserver from hwclock to desired ntp servers  using below command Citrix Hypervisor 8.2

# chronyd -q 'server 0.xenserver.pool.ntp.org iburst'

5. Start chronyd service, It will Sync the host to NTP servers now.

Use below command to start service
 

systemctl start chronyd

 

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Problem Cause

Xenserver is taking the date/time settings from hardware clock

This article describes steps to follow in case we are not able to sync xenserver to NTP