On Thu, Nov 27, 2014 at 10:53:45PM +0100, Tom Gundersen wrote: > On Thu, Nov 27, 2014 at 10:00 PM, Andrew Lutomirski <l...@mit.edu> wrote: > > On Thu, Nov 27, 2014 at 12:51 PM, Tom Gundersen <t...@jklm.no> wrote: > >> On Wed, Nov 26, 2014 at 3:10 PM, Chris Adams <li...@cmadams.net> wrote: > >>> Once upon a time, Tomasz Torcz <to...@pipebreaker.pl> said: > >>>> On Wed, Nov 26, 2014 at 08:01:37AM -0600, Chris Adams wrote: > >>>> > Once upon a time, Florian Weimer <fwei...@redhat.com> said: > >>>> > > Do we even use the DHCP NTP server assignment? > >>>> > > >>>> > I believe it is used for chrony and ntpd, don't know about sysmted's > >>>> > new > >>>> > implementation. > >>>> > >>>> systemd-timesyncd uses DHCP-provided NTP servers only if > >>>> systemd-networkd > >>>> is used as DHCP client. > >>> > >> There are technical reasons for this choice, not merely NIH. > > > > And those technical reasons are? > > > > I realize that the shell-script-fu that most DHCP clients seem to > > require is a bit messy, but it does work, and it should be more than > > flexible enough to plug in some systemd-timesyncd controls. > > > networkd allows consumers of network information (such as NTP servers, > DNS resolvers, HTTP proxy brokers,...) to subscribe to this > information (currently only via a C API [0], but could just as well > have been dbus) and be notified of changes to it. Other DHCP clients > will typically instead call a bunch of hooks (with env vars set) on > every configuration change (and it is then presumably the job of the > hook to instruct the NTP client, or whatever else, to change its > config).
Nb. chronyd's unit in Fedora has: ExecStartPost=/usr/libexec/chrony-helper add-dhclient-servers This is a script which gets NTP servers names from dhclient and feeds them to chronyd. Nothing prevents extending this script to get data from networkd, too. (sorry about slight offtopic). -- Tomasz Torcz "Never underestimate the bandwidth of a station xmpp: zdzich...@chrome.pl wagon filled with backup tapes." -- Jim Gray -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
