yahoo-eng-team team mailing list archive

[Graham Leggett <minfrin@xxxxxxxx>]

Public bug reported:

Currently, the NTP module configures ntpd during cloud-init install by
installing and configuring ntpd.

ntpd competes with systemd-timesyncd on systemd distros like Ubuntu
Xenial.

Ideally the NTP module should configure systemd-timesyncd where present,
falling back to ntpd where not present.

This stops two separate daemons (ntpd and systemd-timesyncd) competing
with each other to set the time, where systemd-timesyncd (on Ubuntu at
least) has an internal hardcoded compiled in timeserver to fall back on
if no timeserver is configured (which is bad, but what can you do).

The competing timeserver behaviour is invisible when the machine can see
the net, but logs this error constantly when the machine cannot see the
net:

systemd-timesyncd[527]: Timed out waiting for reply from 91.189.94.4:123
(ntp.ubuntu.com).

** Affects: cloud-init
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1749722

Title:
  NTP: take into account systemd-timesyncd where present

Status in cloud-init:
  New

Bug description:
  Currently, the NTP module configures ntpd during cloud-init install by
  installing and configuring ntpd.

  ntpd competes with systemd-timesyncd on systemd distros like Ubuntu
  Xenial.

  Ideally the NTP module should configure systemd-timesyncd where
  present, falling back to ntpd where not present.

  This stops two separate daemons (ntpd and systemd-timesyncd) competing
  with each other to set the time, where systemd-timesyncd (on Ubuntu at
  least) has an internal hardcoded compiled in timeserver to fall back
  on if no timeserver is configured (which is bad, but what can you do).

  The competing timeserver behaviour is invisible when the machine can
  see the net, but logs this error constantly when the machine cannot
  see the net:

  systemd-timesyncd[527]: Timed out waiting for reply from
  91.189.94.4:123 (ntp.ubuntu.com).

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