Many thanks Vince and Scott. 

On Sunday, February 10, 2019 at 7:24:12 PM UTC-5, Scott Grayban wrote:
>
> If you look 
> at 
> /lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf
>
> # don't run timesyncd if we have another NTP daemon installed
> *ConditionFileIsExecutable=!/usr/sbin/ntpd*
> ConditionFileIsExecutable=!/usr/sbin/openntpd
> ConditionFileIsExecutable=!/usr/sbin/chronyd
> ConditionFileIsExecutable=!/usr/sbin/VBoxService
>
> So it's completely disabled with NTP
>
> On Sunday, February 10, 2019 at 11:05:40 AM UTC-8, vince wrote:
>>
>> On Sunday, February 10, 2019 at 10:44:48 AM UTC-8, V. Kelly Bellis wrote:
>>>
>>> http://weewx.com/docs/usersguide.htm states that I should run a NTP 
>>> <http://www.ntp.org/> daemon, but doesn't address an existing/ running 
>>> pre-installed timesync service; e.g., installed with Raspbian via NOOBS
>>>
>>> Elsewhere <http://raspberrypi.tomasgreno.cz/ntp-client-and-server.html>, 
>>> we read that timesync and NTP should not be run at the same time - "*but 
>>> you can not have running both of them at the same time*"
>>>
>>> Is the pre-installed timesync sufficient for weewx? Either way, could 
>>> the users guide include some mention of timesync's shortcomings or 
>>> sufficiency insofar as weewx is concerned?
>>>
>>>
>>>
>> The users guide can't/shouldn't try to cover all the nuances of every 
>> operating system nor the sheer unfettered joy that is systemd (ha - beat 
>> Matthew to it!)
>>
>> What happens is if you run NTP, systemd gets out of the way and doesn't 
>> enable its ntp hack/feature/whatever.
>>
>> So, FWIW, I always run NTP because I have decades of positive experience 
>> with that software.   It's a well-understood thing.   Much easier to debug 
>> when that's needed.
>>
>> (and any time I can disable systemd 'helping' me, I tend to do so.  That 
>> thing is much harder to debug when it goes whacko.)
>>  
>>
>

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