Aha! I've found the issue.
/etc/network/if-up.d/ntpdate is called when each network interface comes
up. This happens before network.target is reached, so it happens before
ntp.service would normally be automatically started by systemd.
/etc/network/if-up.d/ntpdate calls `invoke-rc.d ntp stop`, then it runs
ntpdate, then it calls `invoke-rc.d ntp start`.
`invoke-rc.d ntp stop` runs `systemctl stop ntp.service`, which causes
systemd to cancel the ntp.service start task that was automatically
scheduled to happen after network.target.
`invoke-rc.d ntp start` calls `/sbin/runlevel` to determine the current
runlevel so that it can verify the existence of a /etc/rc?.d/S??ntp
symlink for the current runlevel. However, `/sbin/runlevel` returns
"unknown" because systemd has not reached multi-user.target yet.
Therefore, invoke-rc.d determines that the appropriate /etc/rc?.d/S??ntp
symlink does not exist, so it does not call `systemctl start
ntp.service` to start ntp.
Changing /etc/network/if-up.d/ntpdate so that it calls `systemctl start
ntp.service` instead of `invoke-rc.d ntp start` fixes the problem.
However, I think I would consider this to be a bug in invoke-rc.d and
not ntpdate, since invoke-rc.d simply does not work properly when
systemd is being used and invoke-rc.d is called at boot time. At the
very least, I would think invoke-rc.d should document that this is
unsupported, and it should detect and report this condition if invoke-
rc.d is called at boot time (rather than just silently failing).
** Also affects: init-system-helpers (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1577596
Title:
ntpd not started when using ntpdate
Status in init-system-helpers package in Ubuntu:
New
Status in ntp package in Ubuntu:
Confirmed
Bug description:
After updating from 14.04 to 16.04 on a number of my systems, ntpd no
longer starts at boot on any of those systems.
`systemctl status ntp` shows:
ntp.service - LSB: Start NTP daemon
Loaded: loaded (/etc/init.d/ntp; bad; vendor preset: enabled)
Active: inactive (dead)
Docs: man:systemd-sysv-generator(8)
May 02 19:10:14 host systemd[1]: Stopped LSB: Start NTP daemon.
May 02 19:10:17 host systemd[1]: Stopped LSB: Start NTP daemon.
Manually starting it using `systemctl start ntp` works fine. However,
systemd does not seem to want to start it automatically at boot time.
As best as I can tell based on trial and error, there is something
special about the combination of the service being named "ntp.service"
and the service depending on network.target. However, I haven't been
able to identify exactly what is causing this.
If I copy the init script to any other name, everything works fine:
cp /etc/init.d/ntp /etc/init.d/ntpd
Edit /etc/init.d/ntpd and change "Provides: ntp" to "Provides: ntpd"
systemctl enable ntpd
# After a reboot, ntpd.service is started, but ntp.service is not.
If I remove "$network" from the "# Required-Start: $network $remote_fs
$syslog" line in /etc/init.d/ntp, then systemd starts it automatically
... But of course it is started before the network comes up, so it
fails.
If I replace /etc/init.d/ntp with a file containing only the following,
systemd won't try to start it automatically at boot:
#!/bin/sh
### BEGIN INIT INFO
# Provides: ntp
# Required-Start: $network
# Required-Stop: $network
# Default-Start: 2 3 4 5
# Default-Stop: 1
# Short-Description: Start NTP daemon
### END INIT INFO
echo "script was run" >> /ntp.log
If I rename that same dummy script to /etc/init.d/ntp2, it is started
automatically at boot.
However, grepping the systemd source code and my systemd config files for ntp
doesn't seem to find anything that might cause this behavior:
/etc/systemd# grep -iR ntp *
timesyncd.conf:#NTP=
timesyncd.conf:#FallbackNTP=ntp.ubuntu.com
/lib/systemd# grep -R ntp *
system/systemd-timesyncd.service.d/disable-with-time-daemon.conf:ConditionFileIsExecutable=!/usr/sbin/ntpd
system/systemd-timesyncd.service.d/disable-with-time-daemon.conf:ConditionFileIsExecutable=!/usr/sbin/openntpd
Binary file systemd-networkd matches
Binary file systemd-timedated matches
Binary file systemd-timesyncd matches
What else can I do to debug this further?
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