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Is there any issue with running systemd-timesyncd and ntp on the same machine?

I'm asking this because I have started using NTP on all servers but the systemd-timesyncd is running there as well. Should I disable it? Any issues with both running?

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It shouldn't be necessary to disable systemd-timesyncd if you install ntp, because the ntp service configuration includes the following:

# grep -i conflict /lib/systemd/system/ntp.service 
Conflicts=systemd-timesyncd.service

The same applies for the chrony service on newer Ubuntu versions.

There have been startup bugs in the past which meant systemd-timesyncd tried to adjust the clock while another NTP server is running, producing harmless-but-annoying errors in the system logs. So there should be no harm in disabling systemd-timesyncd if that's what you prefer.

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