As I said, there are symlinks in /etc/systemd/system/*.target.wants that allows disabling services like this one from starting. It is enough to remove the one for systemd-timesync.service from multi-user.target.wants directory. If you can do things via some config files you should also be able to do this
W dniu 23.04.2020 o 04:14, www pisze: > > hi Michal and Kevin, > > We applied systemd to embedded Linux, so we often need to update/flash > the whole system. When we select disable *time synchronization* > function, the embedded system will use the time itself. After we update > the system and restart it, we need the *time synchronization* function > is disabled. During the whole startup process, there is no automatic > time synchronization, and *the previous time is used*. Because automatic > time synchronization may change its original time. （*Because the time > of the system itself may be different from that of NTP time.*） > > There is a *timesyncd.conf* file under the system，can the system > automatically turn off the time synchronization function by modifying > this file? > In this way, when updating, I can save this file to solve this problem. > > > thanks, > Byron > > > > > At 2020-04-17 19:44:48, "Michał Zegan" <webczat_...@poczta.onet.pl> wrote: >>I am not quite sure what you mean, but... generally these are symlinks >>in /etc/systemd/system/multi-user.target.wants/ so you could delete them >>manually if your intention is to make the actual os image with this >>disabled from the start... >> >>W dniu 17.04.2020 o 12:10, www pisze: >>> >>> I mean that this configuration can be preserved, even after I update the >>> system, this function can be saved. >>> >>> thanks， >>> Byron >>> >>> >>> >>> >>> At 2020-04-17 18:06:15, "Kevin P. Fleming" <ke...@km6g.us> wrote: >>>>Both of those changes will stop the service from being started, even >>>>when the system is rebooted. You don't need to run these commands >>>>every time, running them one time will change the system configuration >>>>and the service will no longer be started. >>>> >>>>On Fri, Apr 17, 2020 at 2:52 AM www <ouyangxua...@163.com> wrote: >>>>> >>>>> hi Kevin , >>>>> >>>>> Thank you very much for you help. But how can I save this way of closing >>>>> time synchronization by command after system boot up? After I update the >>>>> system, the first time I start it, time synchronization is still enabled >>>>> by default. It's not appropriate if I close it alone every time. So when >>>>> I need it start every time, this function is off. >>>>> >>>>> >>>>> thanks, >>>>> Byron >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> At 2020-04-16 18:28:30, "Kevin P. Fleming" <ke...@km6g.us> wrote: >>>>> >There is no need to modify systemd. >>>>> > >>>>> >$ systemctl disable systemd-timesyncd >>>>> > >>>>> >That command will stop the systemd-timesyncd service from being >>>>> >started. It may also be necessary to mask it: >>>>> > >>>>> >$ systemctl mask systemd-timesyncd >>>>> > >>>>> >On Thu, Apr 16, 2020 at 6:22 AM www <ouyangxua...@163.com> wrote: >>>>> >> >>>>> >> Dear all， >>>>> >> >>>>> >> I want to ask a question，How to modify systemd so that the NTP >>>>> >> function is disabled when systemd is first started? >>>>> >> >>>>> >> The default state of systend is to synchronize time from NTP. We can >>>>> >> use timedatectl command to disable NTP synchronize time. But if I >>>>> >> flash the system, the NTP synchronize time function will auto enable. >>>>> >> so I want modify the systemd and disable NTP synchronize time in >>>>> >> default state. >>>>> >> >>>>> >> thanks, >>>>> >> Byron >>>>> >> >>>>> >> >>>>> >> >>>>> >> >>>>> >> _______________________________________________ >>>>> >> systemd-devel mailing list >>>>> >> systemd-devel@lists.freedesktop.org >>>>> >> https://lists.freedesktop.org/mailman/listinfo/systemd-devel >>>>> >>>>> >>>>> >>>>> >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> systemd-devel mailing list >>> systemd-devel@lists.freedesktop.org >>> https://lists.freedesktop.org/mailman/listinfo/systemd-devel >>> >> > > > > >
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