On Wed, Feb 09, 2022 at 10:49:34AM -0500, Lee wrote: > >> My first thought was telling the machine to ignore the NTP server > >> address handed out via DHCP. Maybe there's a way to do that, but I > >> couldn't figure out how :( > > > > supercede ntp-servers "..." in dhclient.conf should do it for you. > > > > The option was helpfully provided by dhclient.conf(5). > > I tried not giving it a value - ie > supersede ntp-servers ; > > didn't work. Apparently one _has_ to give it a value.
Yup. But you know which NTP servers you want this host to use, do you? > >> >> I tried changing /etc/dhcp/dhclient.conf to request just > >> >> request subnet-mask, broadcast-address, routers, > >> >> interface-mtu, > >> >> rfc3442-classless-static-routes ; > >> >> > >> >> and systemd still restarted ntpd with only the dhcp supplied ntp > >> >> server address ... which is this machine, so all the configured ntp > >> >> servers went away :( > > > > And that merely stopped dhclient from asking DHCP server to provide > > "ntp-server" option. What it cannot stop is DHCP server providing > > "ntp-server" option anyway. > > > > ISC dhclient simply lacks the option to ignore certain options in DHCP > > reply. It can supercede them though. > > The way I read the man page, supercede requires a value. One can say that too. > I can't just say ignore what the DHCP server gives me, I have to say > use <this> instead of what the DHCP server gives me ... and there is > no <this> value, it's several pool & server lines that I don't want > replaced. Changing DHCP client is an option too. > >> >> I then tried telling network manager to just get an ip address & > >> >> subnet mask from dhcp. And still systemd fucked up the ntpd config > >> >> > >> >> What finally worked was editing /usr/lib/ntp/ntp-systemd-wrapper to > >> >> remove ' NTPD_OPTS="$NTPD_OPTS -u $UGID" ' > >> > > >> > Huh? You're saying that removing the "-u $UGID" option made it "work"? > >> > And that it "didn't work" with -u being passed? > > > > Changing the contents of /etc/dhcp/dhclient-exit-hooks.d/ntp would make > > it more friendly for the purpose of the future updates. > > Changing it or moving it to another, clearly not supposed to be > invoked, directory? Removing this hook should be sufficient. Even better - add "exit 0" to the beginning. Reco
