Am 26.07.2015 um 15:39 schrieb Vincent Lefevre: > On 2015-07-26 14:25:20 +0100, Brian wrote: >> On Sun 26 Jul 2015 at 13:59:02 +0100, Lisi Reisz wrote: >>> On Sunday 26 July 2015 13:38:45 Michael Biebl wrote: >>>> >>>> Yes. You actually need to do that. As long as ntp is installed, >>>> systemd-timesyncd won't start. >>>> The assumption here is, that if the admin explicitly installed ntp, it >>>> should be preferred of systemd-timesyncd. >>>> See >>>> >>>> # >>>> /lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.co >>>> nf [Unit] >>>> # don't run timesyncd if we have another NTP daemon installed >>>> ConditionFileIsExecutable=!/usr/sbin/ntpd >>>> ConditionFileIsExecutable=!/usr/sbin/openntpd >>>> ConditionFileIsExecutable=!/usr/sbin/chronyd >>> >>> So ntp won't actually harm anything. It is just unnecessary. >> >> It is necessary to purge it if you want to use systemd-timesyncd. If you >> prefer to use ntp instead of systemd-timesyncd it is not unnecessary. > > Can't the systemd configuration be changed without having to purge > ntp (e.g. to be able to switch between them easily)? You are right, having ntp installed doesn't necessarily mean it is actually enabled. But I would assume for most users this is the case. The Conditions were added to prevent multiple NTP clients being started at the same time. If you want to get rid of those start conditions, you can easily do that. Run $ mkdir /etc/systemd/system/systemd-timesyncd.service.d/ $ touch /etc/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf $ systemctl daemon-reload This will create an empty file which overrides the distro provided disable-with-time-daemon.conf Long term, we want ntp to ship a native service file which has Conflicts=systemd-timesyncd.service This way, only if ntp is installed *and* ntp.service is enabled, it will make sure an enabled systemd-timesyncd.service will not be started. In jessie and sid, ntp does not yet ship a native service file. That's why we chose to add those Conditions. Consider those a temporary workaround. HTH, Michael -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth?
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