<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><p style="margin: 0;"><br></p><div style="margin: 0;">hi Michal and Kevin,</div><div style="margin: 0;"><br></div><div style="margin: 0;">We applied systemd to embedded Linux, so we often need to update/flash the whole system. When we select disable <b>time synchronization</b> function, the embedded system will use the time itself. After we update the system and restart it, we need the <b>time synchronization</b> function is disabled. During the whole startup process, there is no automatic time synchronization, and <b>the previous time is used</b>. Because automatic time synchronization may change its original time. （<b>Because the time of the system itself may be different from that of NTP time.</b>） </div><div style="margin: 0;"><br></div><div style="margin: 0;">There is a <b>timesyncd.conf</b> file under the system，can the system automatically turn off the time synchronization function by modifying this file? </div><div style="margin: 0;">In this way, when updating, I can save this file to solve this problem.</div><p style="margin: 0;"><br></p><div style="margin: 0;">thanks,</div><div style="margin: 0;">Byron</div><p style="margin: 0;"><br></p><div style="position:relative;zoom:1"></div><div id="divNeteaseMailCard"></div><p style="margin: 0;"><br></p><pre><br>At 2020-04-17 19:44:48, "Michał Zegan" <webczat_200@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" <kevin@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 <ouyangxuan10@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" <kevin@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 <ouyangxuan10@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 >> > </pre></div><br><br><span title="neteasefooter"><p> </p></span>