[Bug 1685484] Re: DHCP exit hook for setting systemd-timesyncd NTP servers doesn't work

Thu Apr 27 11:38:27 UTC 2023

Hello,

On Ubuntu desktop 22.04 LTS, it seems that the hook is not executed. I'm
not sure how to verify that but sure thing is the DHCP is well
announcing the ntp server.

DHCP4.OPTION[8]:                        ntp_servers = X.X.X.X
DHCP4.OPTION[18]:                       requested_ntp_servers = 1

Could someone help ?

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Title:
  DHCP exit hook for setting systemd-timesyncd NTP servers doesn't work

Status in network-manager package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Won't Fix
Status in systemd package in Debian:
  Fix Released

Bug description:
  I think it's regression for
  https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1578663 in
  zesty.

  1. NTP servers are send via DHCP and seen by NM:

  $ nmcli con show connection1 | grep ntp
  DHCP4.OPTION[30]:                       requested_ntp_servers = 1
  DHCP4.OPTION[31]:                       ntp_servers = 80.50.231.226 217.96.29.26 212.160.106.226

  2. timesyncd is using hardcoded default NTP server:

  $ systemctl -n 200 status systemd-timesyncd.service
  * systemd-timesyncd.service - Network Time Synchronization
     Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; vendor preset: enabled)
    Drop-In: /lib/systemd/system/systemd-timesyncd.service.d
             `-disable-with-time-daemon.conf
     Active: active (running) since Sat 2017-04-22 13:12:23 CEST; 16min ago
       Docs: man:systemd-timesyncd.service(8)
   Main PID: 576 (systemd-timesyn)
     Status: "Synchronized to time server 91.189.89.199:123 (ntp.ubuntu.com)."
      Tasks: 2 (limit: 4915)
     Memory: 1.5M
        CPU: 20ms
     CGroup: /system.slice/systemd-timesyncd.service
             `-576 /lib/systemd/systemd-timesyncd

  Apr 22 13:12:23 slodki systemd[1]: Starting Network Time Synchronization...
  Apr 22 13:12:23 slodki systemd[1]: Started Network Time Synchronization.
  Apr 22 13:12:53 slodki systemd-timesyncd[576]: Synchronized to time server 91.189.89.199:123 (ntp.ubuntu.com).

  3. There are not other time sync deamons installed:

  $ cat /lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf
  [Unit]
  # don't run timesyncd if we have another NTP daemon installed
  ConditionFileIsExecutable=!/usr/sbin/ntpd
  ConditionFileIsExecutable=!/usr/sbin/openntpd
  ConditionFileIsExecutable=!/usr/sbin/chronyd
  ConditionFileIsExecutable=!/usr/sbin/VBoxService

  $ ls -l /usr/sbin/{ntpd,openntpd,chronyd,VBoxService}
  ls: cannot access '/usr/sbin/ntpd': No such file or directory
  ls: cannot access '/usr/sbin/openntpd': No such file or directory
  ls: cannot access '/usr/sbin/chronyd': No such file or directory
  ls: cannot access '/usr/sbin/VBoxService': No such file or directory

  4. There is only one default timesyncd.conf file with default values:

  $ sudo find / -iname \*timesync\*
  /etc/systemd/timesyncd.conf
  /etc/systemd/system/sysinit.target.wants/systemd-timesyncd.service
  /etc/dhcp/dhclient-exit-hooks.d/timesyncd
  /usr/share/man/man5/timesyncd.conf.d.5.gz
  /usr/share/man/man5/timesyncd.conf.5.gz
  /usr/share/man/man8/systemd-timesyncd.8.gz
  /usr/share/man/man8/systemd-timesyncd.service.8.gz
  /tmp/systemd-private-d029f63116924e99b9fc44caf622e299-systemd-timesyncd.service-6NwdRT
  /lib/systemd/systemd-timesyncd
  /lib/systemd/system/systemd-timesyncd.service
  /lib/systemd/system/systemd-timesyncd.service.d
  /var/tmp/systemd-private-d029f63116924e99b9fc44caf622e299-systemd-timesyncd.service-jz0q47

  $ cat /etc/systemd/timesyncd.conf
  #  This file is part of systemd.
  #
  #  systemd is free software; you can redistribute it and/or modify it
  #  under the terms of the GNU Lesser General Public License as published by
  #  the Free Software Foundation; either version 2.1 of the License, or
  #  (at your option) any later version.
  #
  # Entries in this file show the compile time defaults.
  # You can change settings by editing this file.
  # Defaults can be restored by simply deleting this file.
  #
  # See timesyncd.conf(5) for details.

  [Time]
  #NTP=
  #FallbackNTP=ntp.ubuntu.com

  5. DHCP hook installed as /etc/dhcp/dhclient-exit-hooks.d/timesyncd is
  not working,
  TIMESYNCD_CONF=/run/systemd/timesyncd.conf.d/01-dhclient.conf is not
  created.

  6. After manually executing steps from hook all works as expected:

  $ sudo mkdir -p /run/systemd/timesyncd.conf.d/
  $ sudo cat <<EOF >/run/systemd/timesyncd.conf.d/01-dhclient.conf
  > [Time]
  > NTP=80.50.231.226 217.96.29.26 212.160.106.226
  > EOF
  $ sudo systemctl try-restart systemd-timesyncd.service
  $ sudo systemctl status systemd-timesyncd.service
  * systemd-timesyncd.service - Network Time Synchronization
     Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; vendor preset: enabled)
    Drop-In: /lib/systemd/system/systemd-timesyncd.service.d
             `-disable-with-time-daemon.conf
     Active: active (running) since Sat 2017-04-22 13:47:28 CEST; 2min 6s ago
       Docs: man:systemd-timesyncd.service(8)
   Main PID: 3094 (systemd-timesyn)
     Status: "Synchronized to time server 80.50.231.226:123 (80.50.231.226)."
      Tasks: 2 (limit: 4915)
     Memory: 764.0K
        CPU: 19ms
     CGroup: /system.slice/systemd-timesyncd.service
             `-3094 /lib/systemd/systemd-timesyncd

  Apr 22 13:47:27 slodki systemd[1]: Starting Network Time Synchronization...
  Apr 22 13:47:28 slodki systemd[1]: Started Network Time Synchronization.
  Apr 22 13:47:28 slodki systemd-timesyncd[3094]: Synchronized to time server 80.50.231.226:123 (80.50.231.226).

  So hook is not triggered and NTP servers configuration not passed from DHCP/NM to timesyncd.
  Kubuntu zesty amd64, systemd 232-21ubuntu3, network-manager 1.4.4-1ubuntu3

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