Nutanix NTP Issues & Troubleshooting.

July 24, 2018 at 9:00 am Leave a comment

The below commands helps to troubleshoot and fix NTP issues on Nutanix Cluster. You can run these command by logging to any of the CVM’s.

To check the date on all the nodes

allssh ssh root@192.168.5.1 date

To check the NTP source
allssh ssh root@192.168.5.1 ntpq p
To update the NTP server
allssh ssh root@192.168.5.1 service ntpd stop (Stops the NTP service)
allssh ssh root@192.168.5.1 ntpdate u 1.1.1.1 ( Add the NTP server IP)
allssh ssh root@192.168.5.1 service ntpd start (Starts the NTP service)
(source: http://vmwaremine.com)
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Further Troubleshooting.
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In case if you are bombed with NTP alerts on Prism like Time drift you could run the below commands , But I would recommend to contact support.(By default offset of 3 seconds + or – , will throw these error messages)
To check any communication issues with the NTP server
1) sudo nc  -vu 1.1.1.1 123 (leave it for few minutes and Press CTRL+C)(If your NTP is listening on UDP you will not be getting any response)
2) Read the genesis.out file and look for the offset messages ( allssh grep offset ~/data/logs/genesis.out)
3) Run the ntpdate -d 1.1.1.1 (To check the NTP sync data)
As Nutanix recommends run the below cron job to force the servers to reduce the offset.
allssh ‘(/usr/bin/crontab -l && echo “*/1 * * * * bash -lc /home/nutanix/serviceability/bin/fix_time_drift”) | /usr/bin/crontab -‘
Thereafter you could monitor with the below command to observe the NTP offset is being reduced,
allssh “grep offset ~/data/logs/genesis.out | tail -n10”
Finally make sure to remove the cronjob with the below command.
allssh “(/usr/bin/crontab -l | sed ‘/fix_time_drift/d’ | /usr/bin/crontab -)”.
To check the NTP sync’s on AHV host.
hostssh ntpq -pn
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Entry filed under: Nutanix.

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